Error extraction matching negative feedback adjustable audio power amplifier circuit and pre-distortion cancellation audio power amplifier circuit

Abstract

The application discloses an audio power amplification circuit with adjustable error extraction and matching negative feedback and a pre-distortion cancellation audio power amplification circuit. The audio power amplification circuit comprises: an audio branch circuit connected directly or through a front-stage matching circuit to a main branch differential circuit. The main branch differential circuit is connected to a main branch power amplification output circuit to form a main branch power amplification circuit. A branch extraction signal output end of the main branch power amplification circuit is connected to an extraction signal adjustable circuit. The audio branch circuit is connected to an input end of a clean signal adjusting circuit. By adjusting the phase and amplitude characteristics of the clean signal, the phase and amplitude characteristics of the main branch extraction signal are close to overlap or similar. The positive main branch extraction signal and the negative clean signal are subtracted through an error extraction circuit, and a feedback positive main branch signal, a feedback distortion signal and a noise signal are output to a feedback input end of the main branch differential circuit. The technical scheme of the application realizes reduction of the distortion signal in the main branch power signal and maintains or improves the input signal-to-noise ratio.

Description

Technical Field

[0001] This invention relates to the field of adjustable amplifier circuits with error extraction matching negative feedback, and particularly to an audio power amplifier circuit with adjustable error extraction matching negative feedback and a predistortion cancellation audio power amplifier circuit. Background Technology

[0002] To reduce Total Harmonic Distortion (THD) in existing audio power amplifier circuits, deep negative feedback is typically used to reduce output distortion and noise, thus lowering THD. In this case, the gain of the audio power amplifier circuit is approximately 30dB. Furthermore, with low negative feedback, the effectiveness of the negative feedback in canceling the distortion signal is limited, resulting in worse THD, noise, and distortion. Alternatively, a feedforward error correction method can be used. This involves subtracting the input signal from the output signal of the audio power amplifier circuit to extract the distortion signal in the output signal. This distortion signal is then amplified and used to cancel the distortion signal in the output signal of the audio power amplifier circuit. This approach requires a high-power distortion amplifier circuit, increasing power consumption and inevitably introducing new distortion. Another method involves extracting the distortion signal from the output signal of the audio power amplifier circuit and adding it to the input signal to form an input-injected error feedforward. This can cause oscillation in the audio power amplifier circuit, or active error feedback can be used. Alternatively, a distortion servo system can be used to add an active circuit stage to the audio power amplifier circuit along with normal negative feedback, or a super feedforward circuit. In super feedforward, since an error extraction subtraction circuit is not used to extract the distortion signal of the audio power amplifier circuit, a small-power auxiliary feedforward amplifier circuit is added to the power output stage of the audio power amplifier circuit. The feedforward cancellation in the output circuit is achieved by combining with the output of the LC structure of the power output stage, rather than the feedforward cancellation of the entire audio power amplifier circuit. Here, it is still a negative feedback circuit; or, a linear transfer bias output amplifier circuit can be used, through two pairs of output stage devices, one of which is driven by a scaled-down version of the signal relative to the other, expanding the crossover region to show less jitter and generate lower harmonics.

[0003] Therefore, whether an audio power amplifier circuit can achieve high gain, reduced distortion, and lower noise through low negative feedback under a certain gain setting, while maintaining a stable operating state, is a topic worthy of in-depth research. Summary of the Invention

[0004] This invention provides an audio power amplifier circuit with adjustable error extraction matching negative feedback and a pre-distortion cancellation audio power amplifier circuit, so as to achieve adjustable reduction of the main distortion signal in the main power signal output by the main power amplifier circuit, and maintain or improve the signal-to-noise ratio of the input audio signal, based on a determined main power amplifier circuit gain.

[0005] According to one aspect of the present invention, an audio power amplifier circuit with adjustable error extraction matching negative feedback is provided, wherein an audio signal output from the main signal output terminal of an audio branch circuit or an audio signal output from the output terminal of a pre-stage matching circuit that is equal to the positive feedback main signal extracted by the error extraction circuit is connected to the signal input terminal of a main differential circuit. The main power amplifier circuit is formed by connecting the signal output terminal of the main differential circuit to the signal amplification input terminal of the main power amplifier output circuit. At the branch extraction signal output terminal of the main power amplifier circuit, the positive main extraction signal and main distortion and noise signals extracted by the connected extraction signal adjustable circuit are adjusted. The input terminal of the clean signal adjustment circuit connected to the clean signal output terminal of the audio branch circuit is adjusted. The phase and amplitude characteristics of the clean signal output by the clean signal adjustment circuit in the audio range are adjusted to approximate or similar to the phase and amplitude characteristics of the main extraction signal in the audio range, and the positive or negative clean signal and clean distortion and noise signals output by the clean signal adjustment circuit are adjusted. The main path extracted signal and the clean signal are connected to the two positive and negative input terminals of the error extraction circuit. The positive main path extracted signal and the negative clean signal are subtracted in the error extraction circuit. The feedback positive main path signal, feedback distortion signal and noise signal extracted at the output terminal of the error extraction circuit are connected to the feedback input terminal of the main path differential circuit. This forms an audio power amplifier circuit with adjustable error extraction matching negative feedback. The main path power amplifier circuit with low negative feedback operates stably. Based on the determined gain of the main path power amplifier circuit, the main path distortion signal in the main path power signal output terminal of the audio power amplifier circuit with adjustable error extraction matching negative feedback is reduced in an adjustable manner, and the input signal-to-noise ratio is maintained or improved.

[0006] Optionally, the main differential circuit is composed of a differential circuit, a mirror constant current source circuit, a common-emitter common-base differential amplifier circuit, and a constant current source circuit, forming a main mirror constant current source differential circuit, or forming a main common-emitter common-base amplifier mirror constant current source differential circuit; one base input terminal of the main differential circuit is the signal input terminal, the other base input terminal is the feedback input terminal, and the collector on the signal input side of the main differential circuit is the signal output terminal; The main power output circuit is composed of two output terminals of the bias voltage circuit of the main voltage amplifier circuit connected to two input terminals of the main power output stage circuit, or one output terminal of the main voltage amplifier circuit connected to the Class A single transistor input terminal of the main power output stage circuit; the output terminals of the main power output circuit are divided into a power signal output terminal and a branch signal output terminal. The main voltage amplifier circuit is composed of a multi-stage combined voltage amplifier circuit formed by an emitter follower circuit, a voltage amplifier circuit, a common emitter common base amplifier circuit, a differential amplifier circuit, a push-pull voltage amplifier circuit, a bias voltage circuit, a constant current source circuit, or a bootstrap circuit. The bias voltage circuit is installed between the collector output terminal of the main voltage amplifier circuit and the constant current source or bootstrap circuit. The bias voltage circuit consists of a multiplier circuit and a resistor voltage divider circuit. The main power output stage circuit is composed of a multi-stage power output stage circuit formed by an emitter follower circuit, a complementary feedback circuit, a quasi-complementary circuit, or a Class A single-transistor power circuit.

[0007] Optionally, the adjustable signal extraction circuit includes: a load circuit composed of resistors and capacitors, an adjustable voltage divider resistor circuit, and an operational amplifier circuit, forming an operational amplifier or an adjustable resistor circuit for extracting signals. The operational amplifier circuit consists of a voltage amplification operational amplifier circuit or an emitter follower operational amplifier circuit. The load circuit consists of a load resistor connected in series with a capacitor and grounded. The adjustable voltage divider resistor circuit consists of an attenuation resistor connected to the input or / or output of the load circuit, wherein the connection point between the attenuation resistor and the load circuit is the output of the adjustable voltage divider resistor circuit. The signal extraction operational amplifier or resistor-adjustable circuit comprises a load circuit, a voltage divider resistor-adjustable circuit, and an operational amplifier circuit. The input terminal of the signal extraction operational amplifier or resistor-adjustable circuit is connected to the branch extraction signal output terminal of the main power amplifier circuit, and the positive extraction signal output by the signal extraction operational amplifier or resistor-adjustable circuit is connected to the positive input terminal of the error single-stage extraction circuit. Specifically, by adjusting the voltage division ratio of the adjustable voltage divider resistor in the adjustable signal extraction circuit and adjusting the amplification ratio of the operational amplifier circuit, the positive main path extracted signal and main path distortion and noise signals extracted by the adjustable signal extraction circuit are subtracted from the negative clean signal in the error extraction circuit. This makes the feedback positive main path signal and feedback distortion and noise signals output by the error extraction circuit stable in the low negative feedback main path power amplifier circuit. Furthermore, based on the determined gain of the main path power amplifier circuit, the main path distortion signal in the main path power signal output by the power signal output terminal of the audio power amplifier circuit with adjustable negative feedback matching is reduced, and the input signal-to-noise ratio is maintained or improved.

[0008] The clean signal conditioning circuit includes: a clean signal combining conditioning circuit, or a clean signal splitting conditioning circuit, which is formed by combining an audio splitting circuit, an operational amplifier circuit, an RC phase-shifting circuit, an adjustable voltage divider resistor circuit, a load circuit, and a splitting circuit. Among them, the RC phase shift circuit is formed by using resistors and capacitors to form an RC low-pass phase shift circuit according to the requirements of a low-pass filter; or to form an RC high-pass phase shift circuit according to the requirements of a high-pass filter; or to form an RC band-pass phase shift circuit according to the requirements of a low-pass filter and a high-pass filter connected in series to form a band-pass filter. The combined operational amplifier circuit consists of an operational amplifier circuit, an instrumentation amplification circuit, a subtraction circuit, a symmetrical buffer differential amplification circuit, and an operational amplifier subtraction circuit. The clean signal combining adjustment circuit includes: connecting the voltage divider adjustable circuit or load circuit through the RC phase shift circuit, or connecting the input terminal of the RC phase shift circuit to the output terminal of the combined operational amplifier circuit or the output terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, or connecting the output terminal of the RC phase shift circuit to the input terminal of the combined operational amplifier circuit or the input terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, forming a single-channel clean signal operational amplifier combining adjustment circuit; Alternatively, multiple single-channel clean signal operational amplifier combining adjustment circuits can be used, with their input terminals connected in parallel and their output terminals connected in parallel, to form a multi-channel clean signal operational amplifier combining adjustment circuit; wherein, the positive clean signal output from the output terminal of the single-channel or multi-channel clean signal operational amplifier combining adjustment circuit is connected to the negative input terminal of the error single-stage extraction operational amplifier circuit; Alternatively, the positive or negative clean signal output from the single or multiple clean signal resistor combining adjustment circuit can be connected to the negative input of the corresponding error single-stage extraction circuit. This circuit can be connected either through a resistor-capacitor phase-shifting circuit or a voltage divider resistor adjustable circuit. The clean signal shunting adjustment circuit includes: two or more clean signal combining adjustment circuits connected in parallel to form two or more output terminals; two or more corresponding positive or negative clean signals output to form a multi-channel clean signal shunting adjustment circuit; or a shunting circuit connected to the output terminal of the clean signal combining adjustment circuit to form two or more output terminals, outputting two or more corresponding positive or negative clean signals to form a single-channel clean signal shunting adjustment circuit; the clean signal shunting adjustment circuit includes: two or more clean signal operational amplifier or resistor shunting adjustment circuits; Among them, the positive or negative clean signal output by the first output of the two outputs of the clean signal shunt adjustment circuit is the negative input of the first-stage error single-stage extraction circuit in the two-stage error extraction circuit corresponding to the positive or negative clean signal output by the second output of the two outputs of the clean signal shunt adjustment circuit; the negative input of the second-stage error single-stage extraction circuit in the two-stage error extraction circuit corresponding to the positive or negative clean signal output by the second output of the clean signal shunt adjustment circuit. Specifically, by adjusting the amplitude and phase of the RC phase-shifting circuit in the clean signal adjustment circuit, the phase and amplitude characteristics of the audio signal at the input terminal of the input audio branch circuit, after passing through the clean signal adjustment circuit, are made close to or approximate to the phase and amplitude characteristics of the main extracted signal output from the adjustable extraction signal circuit connected to the branch signal output terminal of the main power amplifier circuit within the audio range. This eliminates self-oscillation in the main power amplifier circuit and stabilizes its operating state. Furthermore, by adjusting the voltage amplification factor in the combined operational amplifier circuit within the clean signal adjustment circuit, the phase and amplitude characteristics of the main extracted signal within the audio range are made close to or approximate to the phase and amplitude characteristics of the main extracted signal output from the adjustable extraction signal circuit connected to the branch signal output terminal of the main power amplifier circuit. The voltage division ratio of the adjustable resistor circuit and the attenuation value of the RC phase-shifting circuit ensure that the positive or negative clean signal, clean distortion, and noise signal output by the clean signal adjustment circuit meet the requirements of the feedback positive main path signal, feedback distortion, and noise signal output after subtracting the negative clean signal from the positive main path extraction signal in the error extraction circuit. This ensures the stable operation of the low negative feedback main path power amplifier circuit. Furthermore, based on a determined main path power amplifier circuit gain, the main path distortion signal in the main path power signal output from the power signal output terminal of the adjustable negative feedback audio power amplifier circuit is reduced, and the input signal-to-noise ratio is maintained or increased. The audio branch circuit is composed of capacitors connected to the input terminal of the branch circuit or capacitors connected to the two output terminals of the branch circuit respectively. The main signal output terminal of the two output terminals of the audio branch circuit is connected to the signal input terminal of the main differential circuit, or connected to the signal input terminal of the main differential circuit via a pre-stage matching circuit. The clean signal output terminal of the two output terminals of the audio branch circuit is connected to the input terminal of the clean signal adjustment circuit.

[0009] Optionally, the error extraction circuit includes: a single-stage or two-stage error extraction circuit composed of a combination of an operational amplifier subtraction circuit, a load circuit, an adjustable voltage divider resistor circuit, and a combining circuit. Among them, the single-stage or two-stage error extraction circuit includes: a single-stage or two-stage error extraction operational amplifier circuit, or a single-stage or two-stage error extraction resistor circuit, or a single-stage or two-stage error extraction inductor-capacitor circuit. Among them, the combined operational amplifier subtraction circuit consists of an operational amplifier subtraction circuit, an instrument measurement amplification subtraction circuit, a non-inverting series operational amplifier subtraction circuit, a non-inverting or inverting operational amplifier circuit, and an operational amplifier subtraction circuit with inverting addition and / or positive addition. It is composed according to the function of subtracting the input signal or the function of subtracting the input signal after amplification. Each input terminal of the combined operational amplifier subtraction circuit is divided into one input terminal or one input terminal after multiple additions. The single-stage error extraction operational amplifier circuit is composed of a combined operational amplifier subtraction circuit output terminal connected to the load circuit input terminal, or connected to the input terminal of a voltage divider resistor adjustable circuit. The positive input terminal of the single-stage error extraction operational amplifier circuit is connected to the positive extraction signal output from the extraction signal adjustable circuit output terminal, and the negative input terminal is connected to the positive clean signal output from the single-channel or multi-channel clean signal combining or splitting adjustment circuit output terminal; or the negative input terminal and the inverting multi-channel addition multi-channel input terminal of the single-stage error extraction operational amplifier circuit are respectively connected to the multi-channel output terminals of the single-channel or multi-channel clean signal splitting adjustment circuit output multiple positive clean signals. Alternatively, the single-stage error extraction resistor circuit may be connected to the combined output of the combining circuit via the input of the load circuit or the input of the adjustable voltage divider resistor circuit. One input of the combining circuit serves as the positive input of the single-stage error extraction resistor circuit, and the other input serves as the negative input. The positive input of the single-stage error extraction resistor circuit is connected to the positive extraction signal output by the adjustable extraction signal circuit, and the negative input of the single-stage error extraction resistor circuit is connected to the negative clean signal output by the single-channel or multi-channel clean signal combining or splitting adjustment circuit. Alternatively, the single-stage error extraction inductor-capacitor circuit may be composed of an inductor connected to one input terminal of the combiner circuit in the single-stage error extraction resistor circuit, and a capacitor connected to the other input terminal of the combiner circuit. The inductor input terminal is the positive input terminal of the single-stage error extraction inductor-capacitor circuit, and the capacitor input terminal is the negative input terminal. The positive input terminal of the single-stage error extraction inductor-capacitor circuit is connected to the positive extraction signal output from the adjustable extraction signal circuit, and the negative input terminal is connected to the negative clean signal output from the single-channel or multi-channel clean signal combiner or splitter adjustment circuit. The two-stage error extraction circuit includes: a positive extraction signal output from the output of a corresponding adjustable extraction signal circuit connected to the positive input terminal of the first single-stage error extraction circuit; a positive or negative clean signal output from the first output terminal of a corresponding clean signal shunt adjustment circuit connected to the negative input terminal of the first single-stage error extraction circuit; and an operational amplifier, resistor, inductor, or capacitor circuit for two-stage error extraction. Wherein, when the operating voltage of the operational amplifier circuit in the error extraction matching negative feedback adjustable audio power amplifier circuit is less than the operating voltage of the main power amplifier circuit, the operational amplifier circuit connects the corresponding positive and negative power supply terminals, or the positive power supply terminal and ground terminal, respectively, with the same resistors that satisfy the operating voltage of the operational amplifier circuit connected in series between the positive and negative power supply terminals or between the positive power supply terminal and ground terminal; this achieves equal matching between the DC bias voltage at the input terminal of the error extraction circuit and the DC bias voltage at the output terminal of the adjustable signal extraction circuit and the output terminal of the clean signal adjustment circuit, and equal matching between the DC bias voltage at the output terminal of the error extraction circuit and the DC bias voltage at the feedback input terminal of the main differential circuit, and equal matching between the DC bias voltage at the output terminal of the pre-stage matching circuit and the DC bias voltage at the signal input terminal of the main differential circuit; this satisfies the bias midpoint voltage at the power signal output terminal of the main power output stage circuit, and meets the requirements of the main power amplifier circuit with low negative feedback not generating self-oscillation and operating stably. In the error extraction circuit, the difference between the main extracted signal output from the main power amplifier circuit and the clean signal output from the clean signal adjustment circuit is obtained by passing the audio signal through a direct circuit or a pre-stage matching circuit and the branch signal output from the main power amplifier circuit. This difference is used to evaluate the positive feedback main signal, feedback distortion, and noise signals output by the error extraction circuit. This ensures the stable operation of the low negative feedback main power amplifier circuit in the error extraction matched negative feedback adjustable audio power amplifier circuit. Furthermore, based on a determined main power amplifier circuit gain, this circuit achieves adjustable reduction of the main power signal output from the power signal output of the error extraction matched negative feedback adjustable audio power amplifier circuit, as well as maintaining or improving the input signal-to-noise ratio.

[0010] Optionally, the pre-amplifier matching circuit includes: a pre-amplifier resistor matching circuit, a pre-amplifier matching circuit, and a pre-amplifier subtraction matching circuit, which are composed of resistors, a load circuit, an adjustable voltage divider resistor circuit, an audio branch circuit, an operational amplifier circuit, an operational amplifier subtraction circuit, and a branch circuit. The pre-stage resistor matching circuit is composed of an adjustable circuit of resistors or voltage divider resistors. The input terminal of the pre-stage resistor matching circuit is connected to the main signal output terminal of the audio branch circuit, and the output terminal of the pre-stage resistor matching circuit is connected to the signal input terminal of the main differential circuit. When the resistance in the pre-stage resistor matching circuit composed of resistors is zero ohms, it is a through circuit. The pre-amplifier matching circuit is composed of an operational amplifier circuit, or an operational amplifier circuit connected in series with a load circuit or a series voltage divider adjustable circuit. The input terminal of the pre-amplifier matching circuit is connected to the main signal output terminal of the audio splitter circuit, and the output terminal of the pre-amplifier matching circuit is connected to the signal input terminal of the main differential circuit. The pre-amplifier subtraction matching circuit is composed of two components: one output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit, or the other output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit via the operational amplifier circuit; and the other output of the shunt circuit is connected to the negative input of the operational amplifier subtraction circuit via the adjustable voltage divider resistor circuit, or the other output of the shunt circuit is connected to the negative input of the operational amplifier circuit via the adjustable voltage divider resistor circuit in series. The input of the shunt circuit in the pre-amplifier subtraction matching circuit is connected to the main signal output of the audio shunt circuit, and the output of the pre-amplifier subtraction matching circuit is connected to the signal input of the main differential circuit. Specifically, by adjusting the resistors or voltage divider resistors in the pre-stage matching circuit, the audio signal output from the audio branch circuit and then from the pre-stage matching circuit to the main differential circuit signal input is made equal to the positive feedback main circuit signal output after subtracting the clean signal from the main circuit extracted signal in the error extraction circuit. This stabilizes the operation of the low negative feedback main circuit power amplifier in the error extraction matching negative feedback adjustable audio power amplifier circuit. Furthermore, based on a determined main circuit power amplifier gain, it achieves adjustable reduction of the main circuit distortion signal in the main circuit power signal output from the power signal output terminal of the error extraction matching negative feedback adjustable audio power amplifier circuit, while maintaining or improving the input signal-to-noise ratio.

[0011] Optionally, by disconnecting the positive input terminal of the error extraction circuit from the corresponding output terminal of the adjustable extraction signal circuit, and disconnecting the negative input terminal of the error extraction circuit from the corresponding output terminal of the clean signal adjustment circuit, the positive input terminal of the error extraction circuit is connected to the output terminal of the clean signal adjustment circuit, and the negative input terminal of the error extraction circuit is connected to the output terminal of the adjustable extraction signal circuit. In this circuit, the negative input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive main path extraction signal output by the adjustable extraction signal circuit; the positive input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit; or the negative input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the negative main path extraction signal output by the adjustable extraction signal circuit; and the positive input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit. The modified error extraction circuit outputs a feedback negative main path signal, a feedback negative distortion signal, and a noise signal. The modified error extraction circuit outputs a feedback negative distortion signal and a noise signal. Simultaneously, the connection between the output of the error extraction circuit and the feedback input of the main differential circuit is disconnected. Instead, the output of the modified error extraction circuit is fed into the signal input of the main differential circuit via a connected capacitor. Furthermore, a branch feedback signal output is added to the power signal output of the main power amplifier circuit. This branch feedback signal output is connected to the input of a resistive negative feedback circuit composed of voltage divider resistors. The output of this resistive negative feedback circuit is then connected to the feedback input of the main differential circuit, forming a main power amplifier circuit with resistive negative feedback. This constitutes an error extraction input-adjustable negative feedback audio power amplifier circuit. By adjusting the feedback negative distortion signal extracted by the modified error extraction circuit and feeding it into the signal input terminal of the main differential circuit in the main power amplifier circuit with resistive negative feedback, the main distortion signal in the main power signal output terminal of the main power amplifier circuit with adjustable error extraction input is reduced in an adjustable manner.

[0012] According to another aspect of the present invention, a predistortion cancellation audio power amplifier circuit is provided, comprising an audio power amplifier circuit with adjustable error extraction matching negative feedback according to any embodiment of the present invention, wherein the predistortion cancellation audio power amplifier circuit includes: Specifically, one output terminal of audio branch circuit one is connected to the input terminal of audio branch circuit two, and one output terminal of audio branch circuit two is connected to the input terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the input terminal of the branch power amplifier circuit with negative feedback. The branch power signal and branch distortion signal output from the branch power output terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the branch power amplifier circuit with negative feedback are connected to the ground terminal through the connected power load circuit. The branch power output terminal and the power load circuit... At the connection point, the output branch extraction signal and branch distortion signal; the positive or negative branch extraction signal, branch distortion signal and noise signal output by the connected adjustable extraction signal circuit are sent to the negative input terminal of the error extraction circuit; the positive clean signal, clean distortion signal and noise signal output by the connected clean signal adjustment circuit are sent to the positive input terminal of the error extraction circuit; the negative branch extraction signal in the error extraction circuit is subtracted from the positive clean signal, and the negative branch distortion signal and noise signal output by the error extraction circuit are connected to one input terminal of the combiner circuit; One output of the audio branch circuit is connected to a low-distortion or distortion-free pre-amplifier audio signal, which is then connected to another input of the combiner circuit. The output of the combiner circuit, based on the phase and amplitude characteristics of the synchronous audio signal and the negative branch distortion signal within the audio range, outputs a synchronous audio signal with pre-distortion characteristics. This negative branch distortion signal is then connected to the input of a main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or to the input of a main-path power amplifier circuit with negative feedback. The output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or the output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, is then connected to the input of a main-path power amplifier circuit with negative feedback. The main power amplifier circuit amplifies the output terminal, and the main power signal output by the main power amplifier circuit includes the main power distortion signal and the negative branch distortion signal. At the output terminal of the main power amplifier circuit with adjustable negative feedback matching for main power error extraction, or at the output terminal of the main power signal of the main power amplifier circuit with negative feedback, when the time delay is close to equal, the amplitude is close to equal or close to similar overlap, and the phase is opposite or close to opposite, the main power distortion signal and the negative branch distortion signal in the main power signal are canceled out, thereby reducing the main power distortion signal in the main power signal output by the main power amplifier circuit with adjustable negative feedback matching for main power error extraction or the main power amplifier circuit with negative feedback. The branch distortion signal in the branch power signal output by the branch error extraction matching negative feedback adjustable audio power amplifier circuit or the branch power amplifier circuit with negative feedback, the negative branch distortion signal of the synchronous audio signal with pre-distortion characteristics output by the combining circuit, and the synchronous branch distortion signal output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power amplifier circuit with negative feedback are closely overlapped or similar to the synchronous main distortion signal in the main power signal amplified and output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power signal amplified and output by the main power amplifier circuit with negative feedback. The audio power load circuit is composed of a capacitor that connects the resistor that matches and absorbs the power signal of the branch to ground.

[0013] The technical solution of this invention, based on a determined gain of the main power amplifier circuit, adjusts the distortion and noise signals in the main extracted signal output by the adjustable signal extraction circuit, and adjusts the distortion and noise signals in the clean signal output by the adjustable clean signal circuit. After processing by the error extraction circuit, the distortion and noise signals in the output main feedback signal are sent to the feedback input terminal of the main differential circuit. The noise and distortion signals in the audio signal output by the pre-stage matching circuit are connected to the signal input terminal of the main differential circuit. After processing by the main differential circuit, the superimposed distortion and noise signals in the audio signal are subtracted from the positive feedback main signal and the feedback distortion and noise signals output by the error extraction circuit, thereby reducing the distortion and noise signals in the audio signal at the input terminal of the main power amplifier output circuit, and thus improving the signal-to-noise ratio. Since the main power amplifier circuit only corrects the positive feedback main signal and the feedback distortion and noise signals, the corrected parameters account for a very small proportion of the audio signal, thus the main power amplifier circuit is a low negative feedback circuit. By setting the parameters of the main power amplifier circuit, a higher closed-loop gain can be achieved, and the distortion signal in the main power signal can be reduced in an adjustable manner through calibration, while the input signal-to-noise ratio can be maintained or improved.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 2 A circuit structure diagram of a main differential circuit provided in an embodiment of the present invention; Figure 3 A circuit structure diagram of another main differential circuit provided in an embodiment of the present invention; Figure 4 A circuit structure diagram of another main differential circuit provided in an embodiment of the present invention; Figure 5 A circuit structure diagram of another main differential circuit provided in an embodiment of the present invention; Figure 6 A schematic diagram of the main circuit power output circuit provided in an embodiment of the present invention; Figure 7 A circuit structure diagram of a main voltage amplifier circuit provided for an embodiment of the present invention; Figure 8 A circuit structure diagram of another main voltage amplifier circuit provided in an embodiment of the present invention; Figure 9 A circuit structure diagram of a main power output stage circuit provided in an embodiment of the present invention; Figure 10 A circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention; Figure 11 A circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention; Figure 12 A circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention; Figure 13 A circuit diagram of an adjustable signal extraction circuit provided in an embodiment of the present invention; Figure 14 A circuit diagram of another adjustable signal extraction circuit provided in an embodiment of the present invention; Figure 15 A circuit structure diagram of another adjustable signal extraction circuit provided in an embodiment of the present invention; Figure 16 A schematic diagram of another audio power amplifier circuit with adjustable error extraction matching negative feedback provided in an embodiment of the present invention; Figure 17 A schematic diagram of another audio power amplifier circuit with adjustable error extraction matching negative feedback provided in an embodiment of the present invention; Figure 18 A circuit structure diagram of a clean signal conditioning circuit provided in an embodiment of the present invention; Figure 19 A circuit diagram of another clean signal conditioning circuit provided in an embodiment of the present invention; Figure 20 A circuit structure diagram of an audio splitter circuit provided in an embodiment of the present invention; Figure 21 A circuit structure diagram of an audio splitter circuit provided in an embodiment of the present invention; Figure 22 A circuit structure diagram of an error extraction circuit provided in an embodiment of the present invention; Figure 23 A circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention; Figure 24 A circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention; Figure 25 A circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention; Figure 26 A circuit structure diagram of a front-end matching circuit provided in an embodiment of the present invention; Figure 27 A circuit structure diagram of another front-end matching circuit provided in an embodiment of the present invention; Figure 28 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 29 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 30 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 31 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 32 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 33 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 34 A schematic diagram of a main power amplifier circuit provided for the relevant prior art; Figure 35 A schematic diagram of another error extraction matching negative feedback adjustable audio power amplifier circuit provided in an embodiment of the present invention; Figure 36A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 37 This is a schematic diagram of a predistortion cancellation audio power amplifier circuit provided in an embodiment of the present invention. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] Figure 1 This is a schematic diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback, provided by an embodiment of the present invention. This embodiment is applicable to scenarios involving reducing total harmonic distortion (THD) in power amplifier circuits. For example, it can be used to reduce THD in audio power amplifier circuits. Figure 1 As shown, the audio power amplifier circuit with adjustable error extraction matching negative feedback according to an embodiment of the present invention includes: an audio signal output from the main signal output terminal a of the audio branch circuit 1 or an audio signal output from the output terminal of the pre-stage matching circuit 2 that is equal to the feedback positive main signal extracted by the error extraction circuit 7 is connected to the signal input terminal c of the main differential circuit 3. The main power amplifier circuit 30 is formed by connecting the signal output terminal of the main differential circuit 3 to the signal amplification input terminal of the main power amplifier output circuit 4. At the branch extraction signal output terminal of the main power amplifier circuit 30, the positive main extraction signal and main distortion and noise signals extracted by the connected extraction signal adjustable circuit 5 are adjusted. The input terminal of the clean signal adjustment circuit 6 connected to the clean signal output terminal b of the audio branch circuit 1 is adjusted. The phase and amplitude characteristics of the clean signal output by the clean signal adjustment circuit 6 in the audio range are adjusted to be close to or similar to the phase and amplitude characteristics of the main extraction signal in the audio range, and the positive or negative clean signal and clean distortion and noise signals output by the clean signal adjustment circuit 6 are adjusted. The main path extracted signal and the clean signal are connected to the two positive and negative input terminals of the error extraction circuit 7, respectively. After subtracting the negative clean signal from the positive main path extracted signal in the error extraction circuit 7, the feedback positive main path signal, feedback distortion signal, and noise signal extracted at the output terminal of the error extraction circuit 7 are connected to the feedback input terminal d of the main path differential circuit 3. This forms an audio power amplifier circuit with adjustable error extraction matching negative feedback. The main path power amplifier circuit with low negative feedback operates stably, and based on the determined gain of the main path power amplifier circuit 30, the main path distortion signal in the main path power signal output from the power signal output terminal of the audio power amplifier circuit with adjustable error extraction matching negative feedback is reduced in an adjustable manner, while the input signal-to-noise ratio is maintained or improved.

[0020] In this embodiment of the invention, the audio splitter circuit 1 can losslessly split an externally input AC analog audio signal into two identical audio signals. "Lossless" means without damaging the audio signal quality or causing audio signal distortion. The two audio signals are output at the main signal output terminal a and the clean signal output terminal b of the audio splitter circuit 1, respectively.

[0021] The pre-amplifier matching circuit 2 can have an impedance matching function, matching the output impedance of the audio signal from the audio branch circuit 1 with the input impedance of the audio signal from the main differential circuit 3. It can be understood that if the output impedance of the audio signal from the audio branch circuit 1 and the input impedance of the audio signal from the main differential circuit 3 are already matched, then the main output terminal a of the audio branch circuit 1 can be directly connected to the signal input terminal c of the main differential circuit. If impedance mismatch exists, to reduce audio signal loss, the main output terminal a of the audio branch circuit 1 can be connected to the pre-amplifier matching circuit 2. The pre-amplifier matching circuit 2 then performs impedance matching before outputting the audio signal to the signal input terminal c of the main differential circuit.

[0022] The main power amplifier circuit 30 can correct the audio signal output from the pre-stage matching circuit 2 and increase the output power of the audio signal. The main power amplifier circuit 30 outputs a main power signal at its power signal output terminal, which is used to drive a load, such as a loudspeaker. The port of the line connecting the main power amplifier circuit 30 to the load can be considered the power signal output terminal, and the port of the line connecting the main power amplifier circuit 30 to the adjustable signal extraction circuit 5 can be considered the branch extracted signal output terminal.

[0023] The main power amplifier circuit 30 may include a main differential circuit 3 and a main power output circuit 4. The main differential circuit 3 receives an audio signal at its signal input terminal c, and receives a positive feedback main signal, a feedback distortion signal, and a noise signal at its feedback input terminal d. The main differential circuit 3 can correct the audio signal by subtracting the signals at signal input terminal c and feedback input terminal d. The main power output circuit 4 amplifies the audio signal output from the main differential circuit 3, ensuring that the output main power signal is sufficient to drive the load. The output terminal of the main power output circuit 4 is connected to the power signal output terminal of the main power amplifier circuit 30.

[0024] The adjustable signal extraction circuit 5 is connected to the branch signal extraction output terminal of the main power amplifier circuit 30. The adjustable signal extraction circuit 5 can sample the main power signal and adjust its phase and amplitude characteristics within the audio range. It outputs a positive main power signal to the positive input terminal e connected to the error extraction circuit 7. The positive main power signal contains superimposed main power distortion and noise signals. The audio range can be a preset audio frequency range, such as 20Hz-20kHz.

[0025] The input of the clean signal adjustment circuit 6 is connected to the clean signal output terminal b of the audio splitter circuit 1. The clean signal adjustment circuit 6 can adjust the phase and amplitude characteristics of the unprocessed audio signal, outputting a clean signal to the negative input terminal f connected to the error extraction circuit 7. The clean signal contains superimposed clean distortion and noise signals. The clean signal can be either a positive or negative clean signal.

[0026] The phase and amplitude characteristics of the main power signal are adjusted by the adjustable signal extraction circuit 5, and the phase and amplitude characteristics of the unprocessed audio signal are adjusted by the clean signal adjustment circuit 6. This ensures that the deviation between the phase characteristic of the clean signal output by the clean signal adjustment circuit 6 and the phase characteristic of the positive main power signal output by the adjustable signal extraction circuit 5 within the audio range is less than a phase threshold; and that the deviation between the amplitude characteristic of the clean signal output by the clean signal adjustment circuit 6 and the amplitude characteristic of the positive main power signal output by the adjustable signal extraction circuit 5 within the audio range is less than an amplitude threshold. The phase threshold can be the allowable range of phase deviation that ensures the clean signal and the positive main power signal meet the requirement of phase proximity. For example, when the difference between the phase of the positive clean signal and the positive main power signal is 0° or 180°, the phases of the clean signal and the positive main power signal coincide; when the difference between the phase of the negative clean signal and the positive main power signal is 180°, the phases of the negative clean signal and the positive main power signal coincide and are out of phase. When the difference between the phase of the clean signal and the phase of the main path extracted signal is less than the phase threshold, the phases of the clean signal and the main path extracted signal are considered close. The amplitude threshold can be the allowable range of amplitude deviation that ensures the clean signal and the main path extracted signal meet the requirement of amplitude proximity. For example, when the difference between the amplitude of the clean signal and the amplitude of the main path extracted signal is 0, the phases of the clean signal and the amplitudes of the main path extracted signal coincide. When the difference between the amplitude of the clean signal and the amplitude of the main path extracted signal is less than the amplitude threshold, the phases of the clean signal and the amplitudes of the main path extracted signal are considered close.

[0027] The error extraction circuit 7 has two input terminals, including a positive input terminal e and a negative input terminal f. The error extraction circuit 7 subtracts the positive main path extracted signal from the negative clean signal and outputs a feedback positive main path signal to the feedback input terminal d of the main path differential circuit 3. This feedback positive main path signal contains superimposed feedback distortion and noise signals. The feedback positive main path signal can be equal to the audio signal input to the signal input terminal c of the main path differential circuit 3.

[0028] Understandably, the signal output terminal a of audio splitter circuit 1 can be connected to the input terminal of pre-amplifier matching circuit 2 via a capacitor. The clean signal output terminal b of audio splitter circuit 1 can be connected to the input terminal of clean signal adjustment circuit 6 via a capacitor.

[0029] Specifically, the phase and amplitude characteristics of the main power signal are adjusted by the adjustable signal extraction circuit 5, and the phase and amplitude characteristics of the unprocessed audio signal are adjusted by the clean signal adjustment circuit 6, so that the amplitude characteristics of the clean signal in the audio range coincide with or are close to the amplitude characteristics of the positive main channel extracted signal, and the phase characteristics of the clean signal in the audio range coincide with or are close to the phase characteristics of the positive main channel extracted signal. Furthermore, when the positive main channel extracted signal and the clean signal are subtracted in the error extraction circuit 7, the clean signal and the positive main channel extracted signal can be canceled or partially canceled. The feedback positive main channel signal, feedback distortion signal, and noise signal output by the error extraction circuit 7 represent the errors that need to be eliminated or reduced in the negative feedback adjustment. After processing by the main channel differential circuit 3, the distortion signal and noise signal superimposed in the audio signal are subtracted from the feedback positive main channel signal, feedback distortion signal, and noise signal output by the error extraction circuit 7, which can reduce the distortion signal and noise signal in the audio signal at the input of the main channel amplification power output circuit 4, thereby improving the signal-to-noise ratio. Since the main power amplifier circuit 30 only corrects the positive feedback main signal, feedback distortion signal, and noise signal, the parameters being corrected account for a very small percentage of the audio signal. Therefore, the main power amplifier circuit 30 has low negative feedback. The gain of low negative feedback can be less than or equal to 20dB. By setting the parameters of the main power amplifier circuit 30, a higher closed-loop gain can be achieved, and the distortion signal in the main power signal can be adjusted and reduced, while the input signal-to-noise ratio can be maintained or improved, through calibration.

[0030] According to the technical solution of this embodiment of the invention, based on the determined gain of the main power amplifier circuit, the distortion and noise signals in the main extracted signal output by the adjustable signal extraction circuit and the distortion and noise signals in the clean signal output by the adjustable clean signal circuit are adjusted. After processing by the error extraction circuit, the distortion and noise signals in the output main feedback signal are sent to the feedback input terminal of the main differential circuit. The noise and distortion signals in the audio signal output by the pre-stage matching circuit are connected to the signal input terminal of the main differential circuit. After processing by the main differential circuit, the distortion and noise signals superimposed in the audio signal are subtracted from the positive feedback main signal and the feedback distortion and noise signals output by the error extraction circuit, which can reduce the distortion and noise signals in the audio signal at the input terminal of the main power amplifier output circuit, thereby improving the signal-to-noise ratio. Since the main power amplifier circuit only corrects the positive feedback main signal and the feedback distortion and noise signals, the corrected parameters account for a very small proportion in the audio signal, thus the main power amplifier circuit is a low negative feedback circuit. By setting the parameters of the main power amplifier circuit, a higher closed-loop gain can be achieved, and the distortion signal in the main power signal can be reduced in an adjustable manner through calibration, while the input signal-to-noise ratio can be maintained or improved.

[0031] Figure 2A circuit structure diagram of a main differential circuit provided in an embodiment of the present invention; Figure 3 A circuit structure diagram of another main differential circuit provided in an embodiment of the present invention; Figure 4 A circuit structure diagram of another main differential circuit provided in an embodiment of the present invention; Figure 5 This is a circuit structure diagram of another main differential circuit provided in an embodiment of the present invention. In some embodiments, the main differential circuit 3 is composed of a differential circuit 31, a mirror constant current source circuit 32, a common-emitter common-base differential amplifier circuit 33, and a constant current source circuit 34, forming a main mirror constant current source differential circuit, or forming a main common-emitter common-base amplifier mirror constant current source differential circuit; one base input terminal of the main differential circuit is the signal input terminal c, the other base input terminal is the feedback input terminal d, and the collector on the signal input side of the main differential circuit is the signal output terminal g.

[0032] For example, by means of Figure 2 and Figure 3 The circuit structure shown can be a main path differential circuit 3, which can be a main path mirror constant current source differential circuit. Figure 3 The main differential circuit 3 and Figure 2 The difference is: Figure 2 The main differential circuit 3 in the circuit is powered by a single power supply. Figure 3 The main differential circuit 3 in the circuit is powered by dual power supplies; the remaining circuits operate on the same principle. (Reference) Figure 2 In differential circuit 31, the base of one PNP transistor serves as the signal input terminal (c) of the main differential circuit 3, and its collector serves as the signal output terminal (g) of the main differential circuit 3, connected to the input terminal of the main power amplification output circuit 4. The base of the other PNP transistor in differential circuit 31 serves as the feedback input terminal (d) of the main differential circuit 3. A mirror current source circuit 32 is connected in series with differential circuit 31 to provide matching bias current for the two differential branches of differential circuit 31. A constant current source circuit 34 is connected in series with differential circuit 31 to provide a substantially constant total current through the two differential branches of differential circuit 31.

[0033] For example, by means of Figure 4 and Figure 5 The circuit structure shown can be a common-emitter common-base amplifier mirror constant current source differential circuit. Figure 4 The main differential circuit 3 and Figure 5 The difference is: Figure 4 The main differential circuit 3 in the circuit is powered by a single power supply. Figure 5 The main differential circuit 3 in the circuit is powered by dual power supplies, and the rest operate on the same principle. Figure 4 and Figure 5 The common-emitter common-base amplifier mirror constant current source differential circuit and Figure 2 and Figure 3The difference between the main circuit and the mirror current source differential circuit is that a common-base amplifier circuit is connected in series between the differential circuit 31 and the mirror current source circuit 32 to form a common-emitter common-base differential amplifier circuit 33. Through the common-emitter common-base differential amplifier circuit 33, current transfer and node isolation can be achieved between the differential circuit 31 and the mirror current source circuit 32, thereby improving the gain, stability, frequency response speed, and current mirror accuracy of the main circuit 3.

[0034] Figure 6 This is a schematic diagram of a main circuit power output amplifier provided in an embodiment of the present invention. Figure 6 As shown, the main power output circuit 4 is composed of two output terminals of the bias voltage circuit of the main voltage amplifier circuit 41 connected to two input terminals of the main power output stage circuit 42, or one output terminal of the main voltage amplifier circuit connected to the Class A single-transistor input terminal of the main power output stage circuit; wherein, the output terminal of the main power output circuit 4 is divided into a power signal output terminal j and a branch signal output terminal k.

[0035] For example, refer to Figure 6 The input terminal i of the main voltage amplifier circuit 41 is connected to the output terminal g of the main differential circuit 3. The main voltage amplifier circuit 41 is used to linearly amplify the voltage of the audio signal. The input terminal of the main power output stage circuit 42 is connected to the output terminal of the main voltage amplifier circuit 41. The main power output stage circuit 42 is used to convert the voltage signal into a power signal that can drive the load, providing a larger current to the load. The power signal output terminal j is connected to the load, and the branch signal output terminal k is connected to the input terminal of the adjustable signal extraction circuit.

[0036] Figure 7 This is a circuit structure diagram of a main voltage amplifier circuit provided in an embodiment of the present invention. Figure 8 A circuit diagram of another main voltage amplifier circuit provided in an embodiment of the present invention. (Refer to...) Figure 7 and Figure 8 The main voltage amplifier circuit is composed of a multi-stage combined voltage amplifier circuit formed by an emitter follower circuit 411, a voltage amplifier circuit 412, a common emitter common base amplifier circuit, a differential amplifier circuit, a push-pull voltage amplifier circuit, a bias voltage circuit 413, a constant current source circuit 414, or a bootstrap circuit.

[0037] For example, by means of Figure 7 and Figure 8 The circuit structure shown can be a multi-stage combined voltage amplifier circuit 41. Figure 7 The main voltage amplifier circuit 41 and Figure 8 The difference is: Figure 7 The main voltage amplifier circuit 41 is powered by a single power supply. Figure 8 The main voltage amplifier circuit 41 in the circuit is powered by a dual power supply; the rest of the circuit operates on the same principle. (Reference) Figure 8 The base of the transistor in the emitter follower circuit 411 serves as its input terminal, which is also the input terminal i of the main voltage amplifier circuit 41. The emitter follower circuit 411 enhances the current driving capability, provides isolation and buffering, and offers a stable signal to the voltage amplifier circuit 412. The base of the transistor in the voltage amplifier circuit 412 is connected to the emitter of the transistor in the emitter follower circuit 411, enabling linear amplification of the audio signal voltage. The bias voltage circuit 413 serves as the output terminal of the main voltage amplifier circuit 41. It provides a DC bias voltage, ensuring stable operation of the main voltage amplifier circuit 41 in the linear region and reducing cutoff distortion, crossover distortion, and operating point drift. The base h of the constant current source circuit 414 can form a common-base constant current source with the base of the constant current source 34 in the main differential circuit 3.

[0038] It is understandable that voltage amplifier circuit 412 can be replaced by a common-emitter common-base amplifier circuit, a differential amplifier circuit, or a push-pull voltage amplifier circuit. The specific circuit structure of the common-emitter common-base amplifier circuit, differential amplifier circuit, or push-pull voltage amplifier circuit is not limited. Constant current source circuit 414 can be replaced by a bootstrap circuit, and the specific circuit structure of the bootstrap circuit is not limited.

[0039] The bias voltage circuit 413 is installed between the collector output terminal of the main voltage amplifier circuit 41 and the constant current source circuit 413 or the bootstrap circuit. The bias voltage circuit 413 consists of a multiplier circuit and a resistor divider circuit.

[0040] The resistor divider circuit is formed by two resistors connected in series. The multiplier circuit can include an NPN transistor, which can generate a higher bias voltage by utilizing the resistance ratio of the resistor divider circuit. The collector and emitter of the NPN transistor in the bias voltage circuit 413 can be used as the two output terminals of the bias voltage circuit 413.

[0041] Figure 9 This is a circuit structure diagram of a main power output stage circuit provided in an embodiment of the present invention. Figure 10 This is a circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention. (See diagram below.) Figure 9 and Figure 10 As shown, the main power output stage circuit 42 is composed of a multi-stage power output stage circuit formed by an emitter follower circuit, a complementary feedback circuit, a quasi-complementary circuit, or a Class A single-transistor power circuit.

[0042] For example, by means of Figure 9 and Figure 10The circuit structure shown indicates that the main power output stage circuit 42 can be a multi-stage power output stage circuit composed of emitter follower circuits. Figure 9 The main power output stage circuit 42 and Figure 10 The difference is: Figure 9 The main power output stage circuit 42 is powered by a single power supply. Figure 10 The main power output stage circuit 42 is powered by dual power supplies; the rest operate on the same principle. (Reference) Figure 9 A transistor forms an emitter follower circuit, and the input terminal of the emitter follower circuit serves as the input terminal of the main power output stage circuit 42. The same m and n network labels in the main power output stage circuit 42 and the voltage amplifier circuit 41 indicate that they have an electrical connection relationship.

[0043] For example, Figure 11 This is a circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention. Figure 12 This is a circuit structure diagram of another main power output stage circuit provided in an embodiment of the present invention. (See diagram below.) Figure 11 and Figure 12 As shown, the main power output stage circuit 42 can be a multi-stage power output stage circuit composed of complementary feedback circuits. Figure 11 The main power output stage circuit 42 and Figure 12 The difference is: Figure 11 The main power output stage circuit 42 is powered by a single power supply. Figure 12 The main power output stage circuit 42 is powered by dual power supplies, and the rest of the operating principle is the same. The same m and n network labels in the main power output stage circuit 42 and the voltage amplifier circuit 41 indicate that they have an electrical connection relationship.

[0044] It is understandable that the main power output stage circuit 42 can also be formed by a quasi-complementary circuit, which can be a quasi-complementary push-pull output circuit formed by a combination of incompletely complementary transistors. The main power output stage circuit 42 can also be formed by a Class A single-transistor power circuit, where a single power transistor amplifies the signal. When the main power output stage circuit 42 is formed by a Class A single-transistor power circuit, one output terminal of the main voltage amplifier circuit 41 is connected to the Class A single-transistor input terminal of the main power output stage circuit 42.

[0045] Specifically, when the main power amplifier circuit 30 is a single power supply voltage of positive and ground, or a dual power supply voltage of positive and negative power, the ground of the operational amplifier circuit in the signal extraction adjustable circuit 5, the clean signal adjustment circuit 6, the error extraction circuit 7, and the pre-stage matching circuit 2 is a single power supply voltage of positive and ground, or a dual power supply voltage of positive and negative power. Specifically, if the operating voltage of the operational amplifier circuit is less than the single-supply or dual-circuit operating voltage of the main power amplifier circuit, the operational amplifier circuit connects in-phase resistors that meet the operating voltage requirements of the operational amplifier to the corresponding positive power supply terminal, ground terminal, or positive power supply terminal and negative power supply terminal of the operational amplifier through the positive power supply terminal and ground terminal in the single power supply, or the positive power supply terminal and negative power supply terminal in the dual power supply.

[0046] Figure 13 This is a circuit diagram of an adjustable signal extraction circuit provided in an embodiment of the present invention. Figure 14 This is a circuit diagram of another adjustable signal extraction circuit provided in an embodiment of the present invention. Figure 15 This is a circuit structure diagram of another adjustable signal extraction circuit provided in an embodiment of the present invention. (See diagram below.) Figure 13 , Figure 14 and Figure 15 As shown, in some embodiments, the adjustable signal extraction circuit 5 includes: a load circuit 51 composed of resistors and capacitors, an adjustable voltage divider resistor circuit, and an operational amplifier circuit 53, forming an operational amplifier or adjustable resistor circuit for extracting signals.

[0047] Among them, the operational amplifier circuit 53 is composed of a voltage amplification operational amplifier circuit or an emitter follower operational amplifier circuit; The load circuit 51 consists of a load resistor connected in series with a capacitor and grounded. The adjustable voltage divider resistor circuit consists of an attenuation resistor R1 connected to the input or output terminal of the load circuit. The connection point between the attenuation resistor R1 and the load circuit is the output terminal of the adjustable voltage divider resistor circuit. The signal extraction operational amplifier or resistor-adjustable circuit consists of a load circuit, a voltage divider resistor adjustable circuit, and an operational amplifier circuit.

[0048] The input terminal of the extraction signal operational amplifier or resistor-adjustable circuit is connected to the branch extraction signal output terminal of the main power amplifier circuit 30, and the positive extraction signal output from the output terminal of the extraction signal operational amplifier or resistor-adjustable circuit is connected to the positive input terminal of the error single-stage extraction circuit 7.

[0049] For example, the adjustable signal extraction circuit 5 can output a positive main path extraction signal. (See reference) Figure 13 The adjustable signal extraction circuit 5 includes an adjustable signal extraction resistor circuit. The adjustable signal extraction resistor circuit can be composed of... Figure 13The load circuit 51 shown is configured as follows. The input terminal of the load circuit 51 is the input terminal of the adjustable signal extraction circuit 5, and the output terminal of the load circuit 51 is the output terminal of the adjustable signal extraction circuit 5. The adjustable signal extraction resistor circuit can be composed of an attenuation resistor R1 and the load circuit 51. The attenuation resistor R1 is connected in series with the resistor in the load circuit 51 to divide the voltage. The attenuation resistor R1 and the load circuit 51 together form an adjustable voltage divider resistor circuit. The input terminal of the attenuation resistor R1 serves as the input terminal of the adjustable signal extraction circuit 5 and is connected to the branch signal extraction output terminal k of the main power amplifier circuit 30. The output terminal of the attenuation resistor R1 is connected to the input terminal of the load circuit 51. The output terminal of the load circuit 51 serves as the output terminal of the adjustable signal extraction circuit 5 and is connected to the positive input terminal e of the error extraction circuit 7.

[0050] For example, refer to Figure 14 The adjustable signal extraction circuit 5 may further include an adjustable signal extraction operational amplifier circuit. This adjustable signal extraction operational amplifier circuit can be composed of a load circuit 51 and an operational amplifier circuit 53. The input terminal of the operational amplifier circuit 53 is connected to the branch signal extraction output terminal k of the main power amplifier circuit 30, and the output terminal of the operational amplifier circuit 53 is connected to the input terminal of the load circuit 51. The output terminal of the load circuit 51 is the positive input terminal e of the error extraction circuit 7. The operational amplifier circuit 53 can be composed of a voltage amplification operational amplifier circuit or an emitter follower operational amplifier circuit. The specific circuit structure of the voltage amplification operational amplifier circuit or the emitter follower operational amplifier circuit is not specifically limited.

[0051] For example, refer to Figure 15 The adjustable signal extraction circuit 5 may further include an adjustable signal extraction operational amplifier or a resistor-adjustable circuit. The adjustable signal extraction operational amplifier circuit may consist of a load circuit 51, an operational amplifier circuit 53, and a voltage divider resistor-adjustable circuit 54. The input terminal of the voltage divider resistor-adjustable circuit 54 serves as the input terminal of the adjustable signal extraction circuit 5, and is connected to the branch signal extraction output terminal k of the main power amplifier circuit 30. The output terminal of the voltage divider resistor-adjustable circuit 54 is connected to the input terminal of the operational amplifier circuit 53. The output terminal of the operational amplifier circuit 53 is connected to the input terminal of the load circuit 51. The output terminal of the load circuit 51 is the positive input terminal e of the error extraction circuit 7.

[0052] Specifically, by adjusting the voltage division ratio of the adjustable voltage divider resistor in the adjustable signal extraction circuit 5 and adjusting the amplification ratio of the operational amplifier circuit 53, the positive main path extracted signal and main path distortion and noise signals extracted by the adjustable signal extraction circuit 5 are subtracted from the negative clean signal in the error extraction circuit 7. This makes the feedback positive main path signal and feedback distortion and noise signals output by the error extraction circuit 7 stable in the low negative feedback main path power amplifier circuit 30. Based on the determined gain of the main path power amplifier circuit 30, the main path distortion signal in the main path power signal output by the power signal output terminal of the audio power amplifier circuit with adjustable negative feedback is reduced, and the input signal-to-noise ratio is maintained or improved.

[0053] Figure 16 A schematic diagram of another audio power amplifier circuit with adjustable error extraction matching negative feedback provided in an embodiment of the present invention; Figure 17 A schematic diagram of another audio power amplifier circuit with adjustable error extraction matching negative feedback provided in an embodiment of the present invention; Figure 18 A circuit structure diagram of a clean signal conditioning circuit provided in an embodiment of the present invention; Figure 19 A circuit diagram of another clean signal conditioning circuit provided in an embodiment of the present invention. (Refer to...) Figure 16 , Figure 17 , Figure 18 and Figure 19 In some embodiments, the clean signal adjustment circuit includes: combining an operational amplifier circuit, an RC phase-shifting circuit, an adjustable voltage divider resistor circuit, a load circuit, and a shunt circuit through an audio shunt circuit to form a clean signal combining adjustment circuit, or forming a clean signal splitting adjustment circuit.

[0054] Among them, the RC phase shift circuit is formed by using resistors and capacitors to form an RC low-pass phase shift circuit according to the requirements of a low-pass filter; or to form an RC high-pass phase shift circuit according to the requirements of a high-pass filter; or to form an RC band-pass phase shift circuit according to the requirements of a low-pass filter and a high-pass filter connected in series to form a band-pass filter. The combined operational amplifier circuit consists of an operational amplifier circuit, an instrumentation amplification circuit, a subtraction circuit, a symmetrical buffer differential amplification circuit, and an operational amplifier subtraction circuit. The clean signal combining adjustment circuit includes: connecting the voltage divider adjustable circuit or load circuit through the RC phase shift circuit, or connecting the input terminal of the RC phase shift circuit to the output terminal of the combined operational amplifier circuit or the output terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, or connecting the output terminal of the RC phase shift circuit to the input terminal of the combined operational amplifier circuit or the input terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, forming a single-channel clean signal operational amplifier combining adjustment circuit; Alternatively, multiple single-channel clean signal operational amplifier combining adjustment circuits can be used, with their input terminals connected in parallel and their output terminals connected in parallel, to form a multi-channel clean signal operational amplifier combining adjustment circuit; wherein, the positive clean signal output from the output terminal of the single-channel or multi-channel clean signal operational amplifier combining adjustment circuit is connected to the negative input terminal of the error single-stage extraction operational amplifier circuit; Alternatively, the positive or negative clean signal output from the single or multiple clean signal resistor combining adjustment circuit can be connected to the negative input of the corresponding error single-stage extraction circuit. This circuit can be connected either through a resistor-capacitor phase-shifting circuit or a voltage divider resistor adjustable circuit. The clean signal shunting adjustment circuit includes: two or more clean signal combining adjustment circuits connected in parallel to form two or more output terminals; two or more corresponding positive or negative clean signals output to form a multi-channel clean signal shunting adjustment circuit; or a shunting circuit connected to the output terminal of the clean signal combining adjustment circuit to form two or more output terminals, outputting two or more corresponding positive or negative clean signals to form a single-channel clean signal shunting adjustment circuit; the clean signal shunting adjustment circuit includes: two or more clean signal operational amplifier or resistor shunting adjustment circuits; Specifically, the positive or negative clean signal output from the first output of the clean signal shunt adjustment circuit corresponds to the negative input of the first-stage error extraction circuit in the two-stage error extraction circuit; the positive or negative clean signal output from the second output of the clean signal shunt adjustment circuit corresponds to the negative input of the second-stage error extraction circuit in the two-stage error extraction circuit.

[0055] Clean signal conditioning circuit 6 can be configured as follows: Figure 16 The clean signal combining adjustment circuit shown It can also be composed of, for example Figure 17 The clean signal shunt adjustment circuit shown .

[0056] For example, such as Figure 18 As shown, clean signal combining adjustment circuit It may consist of one, two, or more clean signal adjustment circuits. It may include a single-channel clean signal combining adjustment circuit, with its input connected to the clean signal output (b) of the audio splitter circuit 1, and its output connected to the negative input (f) of the error extraction circuit 7. It may also include two or more multi-channel clean signal combining adjustment circuits, with each input connected in parallel and to the clean signal output (b) of the audio splitter circuit 1. Each output of the multi-channel clean signal combining adjustment circuit is connected in parallel, and the combined circuit is connected to the negative input (f) of the error extraction circuit 7.

[0057] For example, Figure 18 and Figure 19 The circuit structure of a clean signal conditioning circuit is presented. Figure 18 and Figure 19 The difference is: Figure 18 The clean signal conditioning circuit 6 in the middle is powered by a single power supply. Figure 19 The clean signal adjustment circuit 6 is powered by a dual power supply, and its operation is the same as the others. The clean signal adjustment circuit 6 can be a clean signal operational amplifier adjustment circuit. The input terminal of the combined operational amplifier circuit 61 serves as the input terminal of the clean signal adjustment circuit 6 and is connected to the clean signal output terminal b of the audio branch circuit 1. The output terminal of the combined operational amplifier circuit 61 is connected to the input terminal of the RC phase shift circuit 62. The output terminal of the RC phase shift circuit 62 serves as the output terminal of the clean signal adjustment circuit 6 and is connected to the negative input terminal f of the error extraction circuit 7.

[0058] Alternatively, the clean signal conditioning circuit 6 can also be a clean signal operational amplifier conditioning circuit composed of a combined operational amplifier circuit 61, an RC phase-shifting circuit 62, and a load circuit. The input terminal of the combined operational amplifier circuit 61 serves as the input terminal of the clean signal conditioning circuit 6 and is connected to the clean signal output terminal b of the audio branch circuit 1. The output terminal of the combined operational amplifier circuit 61 is connected to the input terminal of the RC phase-shifting circuit 62. The output terminal of the RC phase-shifting circuit 62 is connected to the input terminal of the load circuit, and the output terminal of the load circuit serves as the output terminal of the clean signal conditioning circuit 6, connected to the negative input terminal f of the error extraction circuit 7. Both the fixed potential terminals of the RC phase-shifting circuit 62 and the load circuit are grounded.

[0059] Alternatively, the clean signal adjustment circuit 6 can also be a clean signal resistor adjustment circuit composed of an RC phase shift circuit 62 and a load circuit. The input terminal of the RC phase shift circuit 62 serves as the input terminal of the clean signal adjustment circuit 6 and is connected to the clean signal output terminal b of the audio branch circuit 1. The output terminal of the RC phase shift circuit 62 is connected to the input terminal of the load circuit, and the output terminal of the load circuit serves as the output terminal of the clean signal adjustment circuit 6 and is connected to the negative input terminal f of the error extraction circuit 7. Alternatively, the load circuit can be replaced with a voltage divider resistor adjustable circuit. The circuit structures of the load circuit and the voltage divider resistor adjustable circuit can be found in [reference needed]. Figure 13 The circuit structure in it.

[0060] In addition, such as Figure 18 and Figure 19The clean signal adjustment circuit 6 shown can also be modified as follows: the input terminal of the RC phase shift circuit 62 serves as the input terminal of the clean signal adjustment circuit 6 and is connected to the clean signal output terminal b of the audio branch circuit 1; the output terminal of the RC phase shift circuit 62 is connected to the input terminal of the combined operational amplifier circuit 61. The output terminal of the combined operational amplifier circuit 61 is connected to the input terminal of the load circuit 63, and the output terminal of the load circuit 63 serves as the output terminal of the clean signal adjustment circuit 6 and is connected to the negative input terminal f of the error extraction circuit 7.

[0061] When the clean signal is combined and adjusted by the circuit When composed of two or more clean signal conditioning circuits, the output of each clean signal conditioning circuit 6 can be connected to an adjustable voltage divider resistor circuit for combining. The combined circuit outputs to the negative input terminal f of the error extraction circuit 7. The adjustable voltage divider resistor circuit can be replaced by a load circuit.

[0062] Understandably, a clean signal combining adjustment circuit When the circuit is a single-channel clean signal combining adjustment circuit, and the clean signal adjustment circuit 6 is a clean signal operational amplifier adjustment circuit, then the clean signal combining adjustment circuit... This can be called a single-channel clean signal operational amplifier combining adjustment circuit. When the clean signal adjustment circuit 6 is a clean signal resistor adjustment circuit, it becomes a clean signal combining adjustment circuit. This can be called a single-channel clean signal resistor combining adjustment circuit. Clean signal combining adjustment circuit. When the circuit is a multi-channel clean signal combining adjustment circuit, and the clean signal adjustment circuit 6 is a clean signal operational amplifier adjustment circuit, then the clean signal combining adjustment circuit... This can be called a multi-channel clean signal operational amplifier combining adjustment circuit. When the clean signal adjustment circuit 6 is a clean signal resistor adjustment circuit, it is a clean signal combining adjustment circuit. It can be called a multi-channel clean signal resistor combining and adjustment circuit.

[0063] For example, such as Figure 17 As shown, the clean signal conditioning circuit 6 can constitute a clean signal shunt conditioning circuit. Clean signal shunt adjustment circuit It may include two or more clean signal conditioning circuits 6. Two circuits constitute two-way clean signal splitting conditioning circuits, while multiple circuits constitute multiple-way clean signal splitting conditioning circuits. Each input terminal of the two-way or multiple-way clean signal splitting conditioning circuits is connected in parallel and then connected to the clean signal output terminal b of the audio splitting circuit 1. Clean signal splitting conditioning circuit It can include two or more output terminals. When it includes two output terminals, the output terminals of the two clean signal shunt adjustment circuits each serve as a clean signal shunt adjustment circuit. The two output terminals. When multiple output terminals are included, the output terminals of the multiple clean signal shunt adjustment circuits are respectively clean signal shunt adjustment circuits. Multiple output terminals.

[0064] An example is a clean signal shunt conditioning circuit. When the circuit includes two output terminals, one output terminal of the clean signal adjustment circuit 6 is connected to the negative input terminal f of the first-stage error single-stage extraction circuit 71. The positive input terminal f of the first-stage error single-stage extraction circuit 71 is connected to the output terminal of the adjustable extraction signal circuit 5. The output terminal of the first-stage error single-stage extraction circuit 71 is connected to the positive input terminal e of the second-stage error single-stage extraction circuit 72, and the output terminal of the other clean signal adjustment circuit is connected to the negative input terminal f of the second-stage error single-stage extraction circuit 72. When the clean signal adjustment circuit 6 includes multiple output terminals, each output terminal outputs a positive or negative clean signal, respectively.

[0065] Among them, the clean signal shunt adjustment circuit The two or more clean signal adjustment circuits can each adopt the circuit structure of a clean signal operational amplifier adjustment circuit, or they can each adopt the circuit structure of a clean signal resistor adjustment circuit.

[0066] Understandably, clean signal shunt adjustment circuit When the two clean signal combining adjustment circuits are used, and the clean signal adjustment circuit 6 is a clean signal operational amplifier adjustment circuit, then the clean signal splitting adjustment circuit... This can be called a two-way clean signal operational amplifier combining adjustment circuit. When the clean signal adjustment circuit 6 is a clean signal resistor adjustment circuit, it is a clean signal shunt adjustment circuit. This can be called a two-way clean signal resistor combining adjustment circuit. Clean signal shunt adjustment circuit. When the circuit is a multi-channel clean signal combining adjustment circuit, and the clean signal adjustment circuit 6 is a clean signal operational amplifier adjustment circuit, then the clean signal splitting adjustment circuit... This can be called a multi-channel clean signal operational amplifier combining adjustment circuit. When the clean signal adjustment circuit 6 is a clean signal resistor adjustment circuit, the clean signal shunt adjustment circuit 6'' can be called a multi-channel clean signal resistor combining adjustment circuit.

[0067] Specifically, by adjusting the amplitude and phase of the RC phase-shifting circuit in the clean signal adjustment circuit 6, the phase and amplitude characteristics of the audio signal at the input terminal of the input audio branch circuit 1, and the clean signal output by the clean signal adjustment circuit 6, within the audio range, are made close to or approximate to the phase and amplitude characteristics of the main extracted signal output by the adjustable extraction signal circuit connected to the branch signal output terminal of the main power amplifier circuit 30 within the audio range. This eliminates self-oscillation in the main power amplifier circuit 30 and stabilizes its operating state. Furthermore, by adjusting the voltage amplification factor in the combined operational amplifier circuit within the clean signal adjustment circuit 6... The voltage division ratio of the adjustable voltage divider resistor circuit and the attenuation value of the RC phase shift circuit ensure that the positive or negative clean signal, clean distortion, and noise signal output by the clean signal adjustment circuit 6 meet the requirements of the feedback positive main path signal, feedback distortion, and noise signal output by the error extraction circuit 7 after subtracting the negative clean signal from the positive main path extraction signal. This ensures the stable operation of the low negative feedback main path power amplifier circuit within the error extraction circuit 7. Furthermore, based on the determined gain of the main path power amplifier circuit 30, the main path distortion signal in the main path power signal output from the power signal output terminal of the audio power amplifier circuit with adjustable negative feedback is reduced, and the input signal-to-noise ratio is maintained or increased.

[0068] Figure 20 A circuit structure diagram of an audio splitter circuit provided in an embodiment of the present invention; Figure 21 This is a circuit diagram of an audio splitter circuit provided in an embodiment of the present invention. Figure 20 As shown, the audio branch circuit 1 connects a capacitor to the input terminal of the branch circuit, or as... Figure 21 As shown, the two output terminals of the split circuit are connected to capacitors respectively; wherein, the main signal output terminal a of the two output terminals of the audio split circuit 1 is connected to the signal input terminal c of the main differential circuit 3, or connected to the signal input terminal c of the main differential circuit 3 via the pre-stage matching circuit 2, and the clean signal output terminal b of the two output terminals of the audio split circuit 1 is connected to the input terminal of the clean signal adjustment circuit 6.

[0069] In some embodiments, the error extraction circuit 7 includes: a single-stage or two-stage error extraction circuit formed by combining an operational amplifier subtraction circuit, a load circuit, an adjustable voltage divider resistor circuit, and a combining circuit. The single-stage or two-stage error extraction circuit includes: a single-stage or two-stage error extraction operational amplifier circuit, or a single-stage or two-stage error extraction resistor circuit, or a single-stage or two-stage error extraction inductor-capacitor circuit.

[0070] For example, refer to Figure 16 and Figure 17 ,like Figure 16The error extraction circuit 7 shown is a single-stage error extraction circuit. A single-stage error extraction circuit may include a single-stage error extraction operational amplifier circuit, a single-stage error extraction resistor circuit, or a single-stage error extraction inductor-capacitor circuit. For example... Figure 17 The error extraction circuit 7 shown is a two-stage error extraction circuit, comprising a first single-stage error extraction circuit 71 and a second single-stage error extraction circuit 72. Both the first single-stage error extraction circuit 71 and the second single-stage error extraction circuit 72 can include an error single-stage extraction operational amplifier circuit, an error single-stage extraction resistor circuit, or an error single-stage extraction inductor-capacitor circuit, thereby constituting a multi-stage error extraction operational amplifier circuit, an error multi-stage extraction resistor circuit, or an error multi-stage extraction inductor-capacitor circuit.

[0071] Among them, the combined operational amplifier subtraction circuit consists of an operational amplifier subtraction circuit, an instrument measurement amplification subtraction circuit, a non-inverting series operational amplifier subtraction circuit, a non-inverting or inverting operational amplifier circuit, an inverting addition and / or a normal addition operational amplifier subtraction circuit, and is composed according to the function of subtracting the input signal or the function of subtracting the amplified input signal. Each input terminal of the combined operational amplifier subtraction circuit is divided into one input terminal or one input terminal after multiple additions.

[0072] Figure 22 A circuit structure diagram of an error extraction circuit provided in an embodiment of the present invention; Figure 23 A circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention. (See diagram below.) Figure 22 or Figure 23 As shown, the single-stage error extraction operational amplifier circuit is composed of a combined operational amplifier subtraction circuit 711 whose output is connected to the input of a load circuit 712, or to the input of a voltage divider resistor adjustable circuit 713. The positive input of the single-stage error extraction operational amplifier circuit is connected to the positive extraction signal output from the output of the extraction signal adjustable circuit 5, and the negative input is connected to the positive clean signal output from the output of a single-channel or multi-channel clean signal combining or splitting adjustment circuit. Alternatively, the negative input of the single-stage error extraction operational amplifier circuit and its inverting multi-channel input are respectively connected to the multi-channel output of a single-channel or multi-channel clean signal splitting adjustment circuit, which outputs multiple positive clean signals.

[0073] For example, such as Figure 22 As shown, the error extraction circuit 7 can be a single-stage error extraction operational amplifier circuit composed of a combined operational amplifier subtraction circuit 711 and a load circuit 712. The positive input terminal of the combined operational amplifier subtraction circuit 711 serves as the positive input terminal e of the error extraction circuit 7, and the negative input terminal of the combined operational amplifier subtraction circuit 711 serves as the negative input terminal f of the error extraction circuit 7. The output terminal of the combined operational amplifier subtraction circuit 711 is connected to the input terminal of the load circuit 712, and the output terminal of the load circuit 712 serves as the output terminal of the error extraction circuit 7d, which is connected to the feedback input terminal d of the main differential circuit 3.

[0074] like Figure 23 As shown, the error extraction circuit 7 can be a single-stage error extraction operational amplifier circuit composed of a combined operational amplifier subtraction circuit 711 and a voltage divider resistor adjustable circuit 713. The positive input terminal of the combined operational amplifier subtraction circuit 711 serves as the positive input terminal e of the error extraction circuit 7, and the negative input terminal of the combined operational amplifier subtraction circuit 711 serves as the negative input terminal f of the error extraction circuit 7. The output terminal of the combined operational amplifier subtraction circuit 711 is connected to the input terminal of the voltage divider resistor adjustable circuit 713, and the output terminal of the voltage divider resistor adjustable circuit 713 serves as the output terminal of the error extraction circuit 7d, which is connected to the feedback input terminal d of the main differential circuit 3.

[0075] Understandable, Figure 22 and Figure 23 The circuits shown can all be powered by either a single power supply or a dual power supply. Figure 24 This is a circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention. (See diagram below.) Figure 24 As shown, or in one of them, the single-stage error extraction resistor circuit is connected to the combining output terminal of the combining circuit 714 through the input terminal of the load circuit 712 or through the input terminal of the voltage divider resistor adjustable circuit; wherein, one input terminal of the combining circuit 714 is the positive input terminal of the single-stage error extraction resistor circuit, and the other input terminal of the combining circuit 714 is the negative input terminal of the single-stage error extraction resistor circuit; the positive input terminal of the single-stage error extraction resistor circuit is connected to the positive extraction signal output by the output terminal of the extraction signal adjustable circuit 5, and the negative input terminal of the single-stage error extraction resistor circuit is connected to the negative clean signal output by the output terminal of the single-channel or multi-channel clean signal combining or splitting adjustment circuit.

[0076] like Figure 24 As shown, the error extraction circuit 7 can be a single-stage error extraction resistor circuit composed of a combiner circuit 714 and a load circuit 712. The input terminals of the combiner circuit 714 serve as the positive input terminal e and the negative input terminal f of the error extraction circuit 7. The input terminals of the combiner circuit 713 are simultaneously connected to the output terminals of the adjustable extraction signal circuit 5 and the clean signal adjustment circuit 6. The output terminal of the combiner circuit 714 is connected to one end of a resistor, and the resistor and capacitor can form a resistor-capacitor phase-shifting circuit. The other end of the resistor is connected to the input terminal of the load circuit 712, and the output terminal of the load circuit 712 serves as the output terminal of the error extraction circuit 7, connected to the feedback input terminal d of the main differential circuit 3.

[0077] The load circuit 712 can be replaced by the adjustable voltage divider resistor circuit 713.

[0078] Figure 25 This is a circuit structure diagram of another error extraction circuit provided in an embodiment of the present invention. (See diagram below.) Figure 25As shown, or in one of them, the single-stage error extraction inductor-capacitor circuit is composed of an inductor connected to one input terminal of the combiner circuit 714 in the single-stage error extraction resistor circuit, and a capacitor connected to the other input terminal of the combiner circuit 714; wherein, the inductor input terminal is the positive input terminal of the single-stage error extraction inductor-capacitor circuit, and the capacitor input terminal is the negative input terminal of the single-stage error extraction inductor-capacitor circuit; the positive input terminal of the single-stage error extraction inductor-capacitor circuit is connected to the positive extraction signal output from the output terminal of the adjustable extraction signal circuit 5, and the negative input terminal of the single-stage error extraction inductor-capacitor circuit is connected to the negative clean signal output from the output terminal of the single-channel or multi-channel clean signal combining or splitting adjustment circuit.

[0079] like Figure 25 As shown, the error extraction circuit 7 can be a single-stage error extraction inductor-capacitor circuit composed of a combiner circuit 714 and a load circuit 712. One end of the combiner circuit 714 can be connected to one end of an inductor, which serves as the positive input terminal e of the error extraction circuit 7. The other end of the combiner circuit 714 can be connected to one end of a capacitor, which serves as another input terminal of the combiner circuit 714 and the negative input terminal f of the error extraction circuit 7. The other end of the inductor is connected to the other end of the capacitor and serves as the output terminal of the combiner circuit 714. The output terminal of the combiner circuit 714 is connected to the input terminal of the load circuit 712, and the output terminal of the load circuit 712 serves as the output terminal of the error extraction circuit 7, which is connected to the feedback input terminal d of the main differential circuit 3.

[0080] The load circuit 712 can be replaced by the adjustable voltage divider resistor circuit 713.

[0081] refer to Figure 17 The two-stage error extraction circuit includes a positive extraction signal output from the output of the corresponding adjustable extraction signal circuit 5 via the positive input terminal of the first single-stage error extraction circuit 71, and a positive or negative clean signal output from the first output terminal of the corresponding clean signal shunt adjustment circuit via the negative input terminal of the first single-stage error extraction circuit 71. The output terminal of the first single-stage error extraction circuit 71 is connected to the positive input terminal of the second single-stage error extraction circuit 72, and the negative input terminal of the second single-stage error extraction circuit 72 is connected to the positive or negative clean signal output from the second output terminal of the corresponding clean signal shunt adjustment circuit, forming a two-stage error extraction operational amplifier or resistor or inductor-capacitor circuit.

[0082] Both the first single-stage error extraction circuit 71 and the second single-stage error extraction circuit 72 can be adopted as follows: Figure 22 , Figure 23 , Figure 24 and Figure 25 The circuit structure of the error extraction circuit 7 is shown. When both the first single-stage error extraction circuit 71 and the second single-stage error extraction circuit 72 are as follows... Figure 22 or Figure 23 When the single-stage error extraction resistor circuit shown is used, the two-stage error extraction circuit can be called a two-stage error extraction operational amplifier circuit. When both the first single-stage error extraction circuit 71 and the second single-stage error extraction circuit 72 are as shown... Figure 24 When the single-stage error extraction resistor circuit shown is used, the two-stage error extraction circuit can be called a two-stage error extraction resistor circuit. When both the first single-stage error extraction circuit 71 and the second single-stage error extraction circuit 72 are as shown... Figure 25 When the single-stage error extraction resistor circuit shown is used, the two-stage error extraction circuit can be called the two-stage error extraction inductor-capacitor circuit.

[0083] When the operating voltage of the operational amplifier circuit in the error extraction matching negative feedback adjustable audio power amplifier circuit is less than the operating voltage of the main power amplifier circuit 30, the operational amplifier circuit connects the corresponding positive and negative power supply terminals, or the positive power supply terminal and the ground terminal, respectively, with the same resistors that meet the operating voltage of the operational amplifier circuit connected in series between the positive and negative power supply terminals or between the positive power supply terminal and the ground terminal. This achieves equal matching between the DC bias voltage at the input terminal of the error extraction circuit 7 and the DC bias voltage at the output terminal of the adjustable signal extraction circuit 5 and the output terminal of the clean signal adjustment circuit, and equal matching between the DC bias voltage at the output terminal of the error extraction circuit 7 and the DC bias voltage at the feedback input terminal of the main differential circuit 3, and equal matching between the DC bias voltage at the output terminal of the pre-stage matching circuit 2 and the DC bias voltage at the signal input terminal of the main differential circuit. This satisfies the bias midpoint voltage at the power signal output terminal of the main power output stage circuit 42, and meets the requirements of the main power amplifier circuit with low negative feedback not generating self-oscillation and operating stably.

[0084] In the error extraction circuit 7, the difference between the main extracted signal output from the main power amplifier circuit 3 via the branch signal output terminal of the main power amplifier circuit 3 and the clean signal output from the clean signal adjustment circuit 6 is used to subtract the main extracted signal from the main extracted signal output from the main power amplifier circuit 5 via the direct-through or pre-stage matching circuit 2. This difference is then used to generate a positive feedback main power signal, feedback distortion, and noise signals at the output of the error extraction circuit 7. This stabilizes the operation of the low negative feedback main power amplifier circuit in the error extraction matching negative feedback adjustable audio power amplifier circuit. Furthermore, based on the determined gain of the main power amplifier circuit 30, it achieves adjustable reduction of the main power signal output from the power signal output terminal of the error extraction matching negative feedback adjustable audio power amplifier circuit, as well as maintaining or improving the input signal-to-noise ratio.

[0085] In some embodiments, the pre-amplifier matching circuit includes: a pre-amplifier resistor matching circuit, a pre-amplifier matching circuit, and a pre-amplifier subtraction matching circuit, which are composed of resistors, a load circuit, an adjustable voltage divider resistor circuit, an audio branch circuit, an operational amplifier circuit, an operational amplifier subtraction circuit, and a branch circuit.

[0086] For example, the pre-stage matching circuit 2 may include one of the following: a pre-stage resistor matching circuit, a pre-stage operational amplifier matching circuit, and a pre-stage subtraction matching circuit.

[0087] The pre-stage resistor matching circuit is composed of an adjustable circuit of resistors or voltage divider resistors. The input terminal of the pre-stage resistor matching circuit is connected to the main signal output terminal of the audio branch circuit, and the output terminal of the pre-stage resistor matching circuit is connected to the signal input terminal of the main differential circuit. When the resistance in the pre-stage resistor matching circuit composed of resistors is zero ohms, it is a through circuit. For example, the pre-amplifier matching circuit 2 can be a pre-amplifier resistor matching circuit. The pre-amplifier resistor matching circuit includes a resistor. One end of the resistor serves as the input terminal of the pre-amplifier matching circuit 2, connected to the main signal output terminal a of the audio branch circuit 1. The other end of the resistor serves as the output terminal of the pre-amplifier matching circuit 2, connected to the signal input terminal c of the main differential circuit 3. It is understood that the resistor in the pre-amplifier matching circuit 2 can be replaced with a voltage divider resistor adjustable circuit; the circuit structure of the voltage divider resistor adjustable circuit can be referenced... Figure 13 The circuit structure in it.

[0088] Figure 26 This is a circuit structure diagram of a front-end matching circuit provided in an embodiment of the present invention. Figure 27 A circuit diagram of another front-end matching circuit provided in an embodiment of the present invention. (See diagram below.) Figure 26 and Figure 27 As shown, the pre-amplifier matching circuit is composed of an operational amplifier circuit 21, or an operational amplifier circuit 21 connected in series with a load circuit 22 or a series voltage divider adjustable circuit 23; the input terminal of the pre-amplifier matching circuit is connected to the main signal output terminal of the audio branch circuit 1, and the output terminal of the pre-amplifier matching circuit is connected to the signal input terminal of the main differential circuit 3.

[0089] For example, the pre-stage matching circuit 2 can be a pre-stage matching op-amp matching circuit. Figure 26 The pre-stage matching circuit 2 in the middle and Figure 27 The difference is: Figure 26 The pre-stage matching circuit 2 is powered by a single power supply. Figure 27 The pre-stage matching circuit 2 in the reference is powered by a dual power supply. Figure 26 The input terminal of operational amplifier circuit 21 serves as the input terminal of pre-amplifier matching circuit 2, and is connected to the main signal output terminal a of audio splitter circuit 1. The output terminal of operational amplifier circuit 21 is connected to the input terminal of load circuit 22, and the output terminal of load circuit 22 serves as the output terminal of pre-amplifier matching circuit 2, and is connected to the signal input terminal c of main differential circuit 3. It can be understood that the load circuit 22 in pre-amplifier matching circuit 2 can be replaced by an adjustable voltage divider resistor circuit 23. For example, Figure 27In the circuit, the load circuit 22 and the attenuation resistor at its front end constitute the adjustable voltage divider circuit 23.

[0090] The pre-amplifier subtraction matching circuit is composed of two circuits: one output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit, or the other output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit via the operational amplifier circuit; and the other output of the shunt circuit is connected to the negative input of the operational amplifier subtraction circuit via the adjustable voltage divider resistor circuit, or the other output of the shunt circuit is connected to the negative input of the operational amplifier circuit via the adjustable voltage divider resistor circuit in series. The input of the shunt circuit in the pre-amplifier subtraction matching circuit is connected to the main signal output of the audio shunt circuit 1, and the output of the pre-amplifier subtraction matching circuit is connected to the signal input of the main differential circuit 3.

[0091] For example, the pre-stage matching circuit 2 can be a pre-stage subtraction matching circuit. This pre-stage subtraction matching circuit can be composed of an operational amplifier (op-amp) subtraction circuit. The positive input of the op-amp subtraction circuit is connected to one output of the branch circuit in the audio branch circuit 1, and the negative input is connected to an adjustable voltage divider circuit, which is then connected to the other output of the branch circuit in the audio branch circuit 1. The output of the op-amp subtraction circuit serves as the output of the pre-stage matching circuit 2. Alternatively, the pre-stage subtraction matching circuit can be composed of an op-amp circuit and an op-amp subtraction circuit. The positive input of the op-amp subtraction circuit is connected to one output of the branch circuit in the audio branch circuit 1. The negative input of the op-amp subtraction circuit is connected to an adjustable voltage divider circuit, which is connected in series with the op-amp circuit, and then connected to the other output of the branch circuit in the audio branch circuit 1. The output of the op-amp subtraction circuit serves as the output of the pre-stage matching circuit 2. Specifically, by adjusting the resistors or voltage divider resistors in the pre-stage matching circuit 2, the audio signal output from the audio branch circuit and then from the pre-stage matching circuit 2 to the signal input of the main differential circuit 3 is equal to the positive feedback main signal output after subtracting the main extracted signal from the clean signal in the error extraction circuit 7. This stabilizes the operation of the low negative feedback main power amplifier circuit in the error extraction matching negative feedback adjustable audio power amplifier circuit. Based on the determined gain of the main power amplifier circuit 30, it also achieves adjustable reduction of the main distortion signal in the main power signal output from the power signal output terminal of the error extraction matching negative feedback adjustable audio power amplifier circuit, and maintains or improves the input signal-to-noise ratio.

[0092] Figure 28 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 29 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 30A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 31 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 32 A circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention; Figure 33 This is a circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback provided in an embodiment of the present invention.

[0093] Understandable, Figures 28-33 The circuit diagrams of some audio power amplifier circuits with adjustable error extraction matching negative feedback are only listed. Based on the embodiments of the present invention, other forms of audio power amplifier circuits with adjustable error extraction matching negative feedback can also be obtained by combination.

[0094] like Figure 32 As shown, exemplarily, the audio splitter circuit includes two stages. The input terminal of the second-stage audio splitter circuit 1 is connected to the clean signal output terminal b of the first-stage audio splitter circuit 1. The second-stage audio splitter circuit 1 then splits the audio signal in two and outputs them to the input terminals of two combined operational amplifier circuits 61. The output terminal of the combined operational amplifier circuit 61 is connected to the input terminal of the RC phase shifter circuit 62. The output terminals of the two RC phase shifter circuits 62 are respectively connected to the input terminals of the adjustable voltage divider resistor circuit 64. The output terminal of the adjustable voltage divider resistor circuit 64 serves as the output terminal of the clean signal adjustment circuit 6 and is connected to the negative input terminal f of the error extraction circuit 7. The fixed potential terminal of the RC phase shifter circuit 62 is grounded.

[0095] Table 1 shows the distortion and noise signal data of the audio power amplifier circuit in any embodiment of the present invention at a gain of 60dB. Figure 34 This is a schematic diagram of a main power amplifier circuit provided for existing related technologies. According to... Figure 34 The main power amplifier circuit shown in Tables 2 and 3 respectively gives the components as follows: Figure 34 The distortion and noise signal data of the audio power amplifier circuit formed by the main power amplifier circuit shown are displayed at a gain of 60dB and 30dB.

[0096] Table 1. Distortion and noise signal data of audio power amplifier circuit at a gain of 60dB. Table 2. Distortion and noise signal data of audio power amplifier circuit at a gain of 30dB. Table 3. Distortion and noise signal data of the audio power amplifier circuit at a gain of 60dB. A comparison of the data in Tables 1, 2, and 3 shows that the noise and distortion in the output signal of the audio power amplifier circuit with adjustable negative feedback for error extraction according to an embodiment of the present invention, under a high gain of 60dB, are similar to those of the audio power amplifier circuit in the prior art under a low gain of 30dB. The comparative analysis of the data in the tables shows that the audio power amplifier circuit with adjustable negative feedback for error extraction according to an embodiment of the present invention has lower noise and distortion in the output power signal under the same gain conditions.

[0097] Based on any of the above embodiments, Figure 35 This is a schematic diagram of another audio power amplifier circuit with adjustable error extraction matching negative feedback provided in an embodiment of the present invention. Figure 36 This is a circuit diagram of an adjustable audio power amplifier circuit with error extraction matching negative feedback, provided as an embodiment of the present invention. Figure 35 As shown, in some embodiments, by disconnecting the positive input terminal of the error extraction circuit from the corresponding output terminal of the adjustable extraction signal circuit, and disconnecting the negative input terminal of the error extraction circuit from the corresponding output terminal of the clean signal adjustment circuit, the positive input terminal of the error extraction circuit is connected to the output terminal of the clean signal adjustment circuit, and the negative input terminal of the error extraction circuit is connected to the output terminal of the adjustable extraction signal circuit. In this circuit, the negative input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive main path extraction signal output by the adjustable extraction signal circuit; the positive input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit; or the negative input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the negative main path extraction signal output by the adjustable extraction signal circuit; and the positive input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit. The modified error extraction circuit outputs a feedback negative main path signal, a feedback negative distortion signal, and a noise signal. The modified error extraction circuit outputs a feedback negative distortion signal and a noise signal. Simultaneously, the connection between the output of the error extraction circuit and the feedback input of the main differential circuit is disconnected. Instead, the output of the modified error extraction circuit is fed into the signal input of the main differential circuit via a connected capacitor. Furthermore, a branch feedback signal output is added to the power signal output of the main power amplifier circuit. This branch feedback signal output is connected to the input of a resistive negative feedback circuit composed of voltage divider resistors. The output of this resistive negative feedback circuit is then connected to the feedback input of the main differential circuit, forming a main power amplifier circuit with resistive negative feedback. This constitutes an error extraction input-adjustable negative feedback audio power amplifier circuit. By adjusting the feedback negative distortion signal extracted by the modified error extraction circuit and feeding it into the signal input terminal of the main differential circuit in the main power amplifier circuit with resistive negative feedback, the main distortion signal in the main power signal output terminal of the main power amplifier circuit with adjustable error extraction input is reduced in an adjustable manner.

[0098] For example, refer to Figure 35 The positive input terminal e of the error extraction circuit 7 is connected to the output terminal of the clean signal adjustment circuit 6, receiving a positive clean signal. The negative input terminal f of the error extraction circuit 7 is connected to the output terminal of the adjustable extraction signal circuit 5, receiving a negative main path extraction signal. The output terminal of the error extraction circuit 7 is connected to the signal input terminal c of the main path differential circuit 3 via a capacitor, outputting a feedback negative main path signal, which is superimposed with a feedback negative distortion signal and a noise signal; or it outputs a feedback negative distortion signal and a noise signal. The error extraction circuit 7 is used to subtract the positive clean signal from the negative main path extraction signal, outputting a feedback negative main path signal, a feedback negative distortion signal, and a noise signal.

[0099] The input terminal of the resistive negative feedback circuit 8 is connected to the branch feedback signal output terminal of the main power amplifier circuit 30. The audio signal at the branch feedback signal output terminal of the power amplifier circuit 30 is consistent with the audio signal at the power signal output terminal of the power amplifier circuit 30. The output terminal of the resistive negative feedback circuit 8 is connected to the feedback input terminal d of the main differential circuit. The resistive negative feedback circuit 8 is composed of resistors connected in series. The main power amplifier circuit 30 and the resistive negative feedback circuit 8 together form a main power amplifier circuit with negative feedback. Furthermore, it can be combined with other circuits to form an audio power amplifier circuit with adjustable error extraction input and negative feedback.

[0100] Figure 37 This is a schematic diagram of a predistortion cancellation audio power amplifier circuit provided in an embodiment of the present invention. Figure 30 As shown, a predistortion-cancelling audio power amplifier circuit is provided, including an audio power amplifier circuit with adjustable error extraction matching negative feedback according to any embodiment of the present invention. The predistortion-cancelling audio power amplifier circuit of the present invention includes: Specifically, one output terminal of audio branch circuit one is connected to the input terminal of audio branch circuit two, and one output terminal of audio branch circuit two is connected to the input terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the input terminal of the branch power amplifier circuit with negative feedback. The branch power signal and branch distortion signal output from the branch power output terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the branch power amplifier circuit with negative feedback are connected to the ground terminal through the connected power load circuit. The branch power output terminal and the power load circuit... At the connection point, the output branch extraction signal and branch distortion signal; the positive or negative branch extraction signal, branch distortion signal and noise signal output by the connected adjustable extraction signal circuit are sent to the negative input terminal of the error extraction circuit; the positive clean signal, clean distortion signal and noise signal output by the connected clean signal adjustment circuit are sent to the positive input terminal of the error extraction circuit; the negative branch extraction signal in the error extraction circuit is subtracted from the positive clean signal, and the negative branch distortion signal and noise signal output by the error extraction circuit are connected to one input terminal of the combiner circuit; One output of the audio branch circuit is connected to a low-distortion or distortion-free pre-amplifier audio signal, which is then connected to another input of the combiner circuit. The output of the combiner circuit, based on the phase and amplitude characteristics of the synchronous audio signal and the negative branch distortion signal within the audio range, outputs a synchronous audio signal with pre-distortion characteristics. This negative branch distortion signal is then connected to the input of a main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or to the input of a main-path power amplifier circuit with negative feedback. The output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or the output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, is then connected to the input of a main-path power amplifier circuit with negative feedback. The main power amplifier circuit amplifies the output terminal, and the main power signal output by the main power amplifier circuit includes the main power distortion signal and the negative branch distortion signal. At the output terminal of the main power amplifier circuit with adjustable negative feedback matching for main power error extraction, or at the output terminal of the main power signal of the main power amplifier circuit with negative feedback, when the time delay is close to equal, the amplitude is close to equal or close to similar overlap, and the phase is opposite or close to opposite, the main power distortion signal and the negative branch distortion signal in the main power signal are canceled out, thereby reducing the main power distortion signal in the main power signal output by the main power amplifier circuit with adjustable negative feedback matching for main power error extraction or the main power amplifier circuit with negative feedback. The branch distortion signal in the branch power signal output by the branch error extraction matching negative feedback adjustable audio power amplifier circuit or the branch power amplifier circuit with negative feedback, the negative branch distortion signal of the synchronous audio signal with pre-distortion characteristics output by the combining circuit, and the synchronous branch distortion signal output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power amplifier circuit with negative feedback are closely overlapped or similar to the synchronous main distortion signal in the main power signal amplified and output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power signal amplified and output by the main power amplifier circuit with negative feedback. The audio power load circuit is composed of a capacitor that connects the resistor that matches and absorbs the power signal of the branch to ground.

[0101] refer to Figure 37 The adjustable audio power amplifier circuit 101 with branch error extraction matching negative feedback can refer to the circuit structure of the adjustable audio power amplifier circuit with error extraction matching negative feedback in any embodiment of the present invention. It is understood that the adjustable audio power amplifier circuit with error extraction matching negative feedback can be replaced with... Figure 36 The diagram shows a main power amplifier circuit with negative feedback. Figure 37 The audio power amplifier circuit with adjustable error extraction matching negative feedback connected to the audio branch circuit 12 is called the branch error extraction matching negative feedback adjustable audio power amplifier circuit 101; the main power amplifier circuit with negative feedback is called the branch power amplifier circuit with negative feedback. Figure 37 The audio power amplifier circuit with adjustable error extraction matching negative feedback connected to the combiner circuit 00 is called the main-path audio power amplifier circuit 102. A main-path power amplifier circuit with negative feedback is called a main-path power amplifier circuit with negative feedback.

[0102] For example, the structures of audio branch circuit 11 and audio branch circuit 12 are the same as those of audio branch circuit 1. The input of the adjustable audio power amplifier circuit 101 with branch error extraction and matching negative feedback is connected to one output of audio branch circuit 12, used to process the audio signal and output a branch power signal and a branch distortion signal. The output of the adjustable audio power amplifier circuit 101 with branch error extraction and matching negative feedback is connected to the power load circuit 9. The output of the adjustable audio power amplifier circuit 101 with branch error extraction and matching negative feedback is also connected to the adjustable extraction signal circuit 5. The adjustable extraction signal circuit 5 outputs a branch extraction signal based on the branch power signal and the branch distortion signal, the branch extraction signal being superimposed with the branch distortion signal and noise signal. The output of the adjustable extraction signal circuit 5 is connected to the positive input of the error extraction circuit 7. The input of the clean signal adjustment circuit 6 is connected to another output of audio branch circuit 12, the clean signal adjustment circuit 6 being used to output a clean signal based on the audio signal, the clean signal being superimposed with the clean distortion signal and noise signal. The output of the clean signal adjustment circuit 6 is connected to the negative input of the error extraction circuit 7. The error extraction circuit 7 is used to process the branch extracted signal and the clean signal. The branch extracted signal and the clean signal cancel each other out or partially cancel each other out, and output the negative branch distortion signal and noise signal.

[0103] The other output of audio splitter circuit 11 is connected to low-distortion preamplifier audio amplifier circuit 10. Low-distortion preamplifier audio amplifier circuit 10 amplifies the audio signal output from audio splitter circuit 11, resulting in a lower degree of distortion between the amplified and unaffected audio signals. The amplified audio signal can be used as the preamplifier audio signal. Low-distortion preamplifier audio amplifier circuit 10 can also be a distortion-free preamplifier audio amplifier circuit, as the output audio signal from a distortion-free preamplifier audio amplifier circuit is undistorted.

[0104] The combiner circuit 00 can be implemented using a combiner. One input terminal of the combiner circuit 00 is connected to the output terminal of the error extraction circuit 7, and the other input terminal of the combiner circuit 00 is connected to the output terminal of the low-distortion preamplifier audio amplifier circuit 10 to synchronize the audio signal and the branch distortion signal.

[0105] The audio signal is pre-processed by forming a branch audio power amplifier circuit with pre-distortion through an audio branch circuit 11, an audio branch circuit 2 12, a branch error extraction matching negative feedback adjustable audio power amplifier circuit 101, an extraction signal adjustable circuit 5, a clean signal adjustment circuit 6, an error extraction circuit 7, a low distortion pre-amplifier circuit 10, and a combiner circuit 00.

[0106] The input terminal of the main path error extraction and matching negative feedback adjustable audio power amplifier circuit 102 is connected to the output terminal of the combiner circuit 00. The main path error extraction and matching negative feedback adjustable audio power amplifier circuit 102 processes the audio signal output by the pre-distorted branch audio power amplifier circuit.

[0107] Understandable, Figure 37 The circuit structure and working principle of the adjustable signal extraction circuit 5, the clean signal adjustment circuit 6, and the error extraction circuit 7 can all refer to any of the above embodiments of the present invention.

[0108] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0109] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An audio power amplifier circuit with adjustable error extraction matching negative feedback, characterized in that, The audio signal output from the main signal output terminal of the audio splitter circuit, or the audio signal output from the pre-stage matching circuit that is equal to the positive feedback main signal extracted by the error extraction circuit, is connected to the signal input terminal of the main differential circuit. The main power amplifier circuit is formed by connecting the signal output terminal of the main differential circuit to the signal amplification input terminal of the main power amplifier output circuit. At the branch extraction signal output terminal of the main power amplifier circuit, the positive main extraction signal and main distortion and noise signals extracted by the connected extraction signal adjustable circuit are adjusted. The input terminal of the clean signal adjustment circuit connected to the clean signal output terminal of the audio branch circuit is adjusted. The phase and amplitude characteristics of the clean signal output by the clean signal adjustment circuit in the audio range are adjusted to approximate or similar to the phase and amplitude characteristics of the main extraction signal in the audio range, and the positive or negative clean signal and clean distortion and noise signals output by the clean signal adjustment circuit are adjusted. The main path extracted signal and the clean signal are connected to the two positive and negative input terminals of the error extraction circuit. The positive main path extracted signal and the negative clean signal are subtracted in the error extraction circuit. The feedback positive main path signal, feedback distortion signal and noise signal extracted at the output terminal of the error extraction circuit are connected to the feedback input terminal of the main path differential circuit. This forms an audio power amplifier circuit with adjustable error extraction matching negative feedback. The main path power amplifier circuit with low negative feedback operates stably. Based on the determined gain of the main path power amplifier circuit, the main path distortion signal in the main path power signal output terminal of the audio power amplifier circuit with adjustable error extraction matching negative feedback is reduced in an adjustable manner, and the input signal-to-noise ratio is maintained or improved.

2. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, in, The main differential circuit consists of a differential circuit, a mirror constant current source circuit, a common-emitter common-base differential amplifier circuit, and a constant current source circuit, forming either a main mirror constant current source differential circuit or a main common-emitter common-base amplifier mirror constant current source differential circuit. One base input terminal of the main differential circuit is the signal input terminal, and the other base input terminal is the feedback input terminal. The collector on the signal input side of the main differential circuit is the signal output terminal. The main power output circuit is composed of two output terminals of the bias voltage circuit of the main voltage amplifier circuit connected to two input terminals of the main power output stage circuit, or one output terminal of the main voltage amplifier circuit connected to the Class A single transistor input terminal of the main power output stage circuit; the output terminals of the main power output circuit are divided into a power signal output terminal and a branch signal output terminal. The main voltage amplifier circuit is composed of a multi-stage combined voltage amplifier circuit formed by an emitter follower circuit, a voltage amplifier circuit, a common emitter common base amplifier circuit, a differential amplifier circuit, a push-pull voltage amplifier circuit, a bias voltage circuit, a constant current source circuit, or a bootstrap circuit. The bias voltage circuit is installed between the collector output terminal of the main voltage amplifier circuit and the constant current source or bootstrap circuit. The bias voltage circuit consists of a multiplier circuit and a resistor voltage divider circuit. The main power output stage circuit is composed of a multi-stage power output stage circuit formed by an emitter follower circuit, a complementary feedback circuit, a quasi-complementary circuit, or a Class A single-transistor power circuit.

3. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, The adjustable signal extraction circuit includes: a load circuit composed of resistors and capacitors, an adjustable voltage divider resistor circuit, and an operational amplifier circuit, forming an operational amplifier or an adjustable resistor circuit for extracting signals. The operational amplifier circuit consists of a voltage amplification operational amplifier circuit or an emitter follower operational amplifier circuit. The load circuit consists of a load resistor connected in series with a capacitor and grounded. The adjustable voltage divider resistor circuit consists of an attenuation resistor connected to the input or output terminal of the load circuit, wherein the connection point between the attenuation resistor and the load circuit is the output terminal of the adjustable voltage divider resistor circuit. The signal extraction operational amplifier or resistor-adjustable circuit comprises a load circuit, a voltage divider resistor-adjustable circuit, and an operational amplifier circuit. The input terminal of the signal extraction operational amplifier or resistor-adjustable circuit is connected to the branch extraction signal output terminal of the main power amplifier circuit, and the positive extraction signal output by the signal extraction operational amplifier or resistor-adjustable circuit is connected to the positive input terminal of the error single-stage extraction circuit. Specifically, by adjusting the voltage division ratio of the adjustable voltage divider resistor in the adjustable signal extraction circuit and adjusting the amplification ratio of the operational amplifier circuit, the positive main path extracted signal and main path distortion and noise signals extracted by the adjustable signal extraction circuit are subtracted from the negative clean signal in the error extraction circuit. This makes the feedback positive main path signal and feedback distortion and noise signals output by the error extraction circuit stable in the low negative feedback main path power amplifier circuit. Furthermore, based on the determined gain of the main path power amplifier circuit, the main path distortion signal in the main path power signal output by the power signal output terminal of the audio power amplifier circuit with adjustable negative feedback matching is reduced, and the input signal-to-noise ratio is maintained or improved.

4. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, in, A clean signal conditioning circuit includes: an audio branching circuit, a combined operational amplifier circuit, an RC phase-shifting circuit, an adjustable voltage divider resistor circuit, a load circuit, and a branching circuit to form a clean signal combining conditioning circuit, or a clean signal splitting conditioning circuit. Among them, the RC phase shift circuit is formed by using resistors and capacitors to form an RC low-pass phase shift circuit according to the requirements of a low-pass filter; or to form an RC high-pass phase shift circuit according to the requirements of a high-pass filter; or to form an RC band-pass phase shift circuit according to the requirements of a low-pass filter and a high-pass filter connected in series to form a band-pass filter. The combined operational amplifier circuit consists of an operational amplifier circuit, an instrumentation amplification circuit, a subtraction circuit, a symmetrical buffer differential amplification circuit, and an operational amplifier subtraction circuit. The clean signal combining adjustment circuit includes: connecting the voltage divider adjustable circuit or load circuit through the RC phase shift circuit, or connecting the input terminal of the RC phase shift circuit to the output terminal of the combined operational amplifier circuit or the output terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, or connecting the output terminal of the RC phase shift circuit to the input terminal of the combined operational amplifier circuit or the input terminal of the voltage amplification operational amplifier circuit in the combined operational amplifier circuit, forming a single-channel clean signal operational amplifier combining adjustment circuit; Alternatively, multiple single-channel clean signal operational amplifier combining adjustment circuits can be used, with their input terminals connected in parallel and their output terminals connected in parallel, to form a multi-channel clean signal operational amplifier combining adjustment circuit; wherein, the positive clean signal output from the output terminal of the single-channel or multi-channel clean signal operational amplifier combining adjustment circuit is connected to the negative input terminal of the error single-stage extraction operational amplifier circuit; Alternatively, the positive or negative clean signal output from the single or multiple clean signal resistor combining adjustment circuit can be connected to the negative input of the corresponding error single-stage extraction circuit. This circuit can be connected either through a resistor-capacitor phase-shifting circuit or a voltage divider resistor adjustable circuit. The clean signal shunting adjustment circuit includes: two or more clean signal combining adjustment circuits connected in parallel to form two or more output terminals; two or more corresponding positive or negative clean signals output to form a multi-channel clean signal shunting adjustment circuit; or a shunting circuit connected to the output terminal of the clean signal combining adjustment circuit to form two or more output terminals, outputting two or more corresponding positive or negative clean signals to form a single-channel clean signal shunting adjustment circuit; the clean signal shunting adjustment circuit includes: two or more clean signal operational amplifier or resistor shunting adjustment circuits; Among them, the positive or negative clean signal output by the first output of the two outputs of the clean signal shunt adjustment circuit is the negative input of the first-stage error single-stage extraction circuit in the two-stage error extraction circuit corresponding to the positive or negative clean signal output by the second output of the two outputs of the clean signal shunt adjustment circuit; the negative input of the second-stage error single-stage extraction circuit in the two-stage error extraction circuit corresponding to the positive or negative clean signal output by the second output of the clean signal shunt adjustment circuit. Specifically, by adjusting the amplitude and phase of the RC phase-shifting circuit in the clean signal adjustment circuit, the phase and amplitude characteristics of the audio signal at the input terminal of the input audio branch circuit, after passing through the clean signal adjustment circuit, are made close to or approximate to the phase and amplitude characteristics of the main extracted signal output from the adjustable extraction signal circuit connected to the branch signal output terminal of the main power amplifier circuit within the audio range. This eliminates self-oscillation in the main power amplifier circuit and stabilizes its operating state. Furthermore, by adjusting the voltage amplification factor in the combined operational amplifier circuit within the clean signal adjustment circuit, the phase and amplitude characteristics of the main extracted signal within the audio range are made close to or approximate to the phase and amplitude characteristics of the main extracted signal output from the adjustable extraction signal circuit connected to the branch signal output terminal of the main power amplifier circuit. The voltage division ratio of the adjustable resistor circuit and the attenuation value of the RC phase-shifting circuit ensure that the positive or negative clean signal, clean distortion, and noise signal output by the clean signal adjustment circuit meet the requirements of the feedback positive main path signal, feedback distortion, and noise signal output after subtracting the negative clean signal from the positive main path extraction signal in the error extraction circuit. This ensures the stable operation of the low negative feedback main path power amplifier circuit. Furthermore, based on a determined main path power amplifier circuit gain, the main path distortion signal in the main path power signal output from the power signal output terminal of the adjustable negative feedback audio power amplifier circuit is reduced, and the input signal-to-noise ratio is maintained or increased. The audio branch circuit is composed of capacitors connected to the input terminal of the branch circuit or capacitors connected to the two output terminals of the branch circuit respectively. The main signal output terminal of the two output terminals of the audio branch circuit is connected to the signal input terminal of the main differential circuit, or connected to the signal input terminal of the main differential circuit via a pre-stage matching circuit. The clean signal output terminal of the two output terminals of the audio branch circuit is connected to the input terminal of the clean signal adjustment circuit.

5. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, The error extraction circuit includes: a single-stage or two-stage error extraction circuit composed of a combination of operational amplifier subtraction circuit, load circuit, adjustable voltage divider resistor circuit, and combining circuit. Among them, the single-stage or two-stage error extraction circuit includes: a single-stage or two-stage error extraction operational amplifier circuit, or a single-stage or two-stage error extraction resistor circuit, or a single-stage or two-stage error extraction inductor-capacitor circuit. Among them, the combined operational amplifier subtraction circuit consists of an operational amplifier subtraction circuit, an instrument measurement amplification subtraction circuit, a non-inverting series operational amplifier subtraction circuit, a non-inverting or inverting operational amplifier circuit, and an operational amplifier subtraction circuit with inverting addition and / or positive addition. It is composed according to the function of subtracting the input signal or the function of subtracting the input signal after amplification. Each input terminal of the combined operational amplifier subtraction circuit is divided into one input terminal or one input terminal after multiple additions. The single-stage error extraction operational amplifier circuit is composed of a combined operational amplifier subtraction circuit output terminal connected to the load circuit input terminal, or connected to the input terminal of a voltage divider resistor adjustable circuit. The positive input terminal of the single-stage error extraction operational amplifier circuit is connected to the positive extraction signal output from the extraction signal adjustable circuit output terminal, and the negative input terminal is connected to the positive clean signal output from the single-channel or multi-channel clean signal combining or splitting adjustment circuit output terminal; or the negative input terminal and the inverting multi-channel addition multi-channel input terminal of the single-stage error extraction operational amplifier circuit are respectively connected to the multi-channel output terminals of the single-channel or multi-channel clean signal splitting adjustment circuit output multiple positive clean signals. Alternatively, the single-stage error extraction resistor circuit may be connected to the combined output of the combining circuit via the input of the load circuit or the input of the adjustable voltage divider resistor circuit. One input of the combining circuit serves as the positive input of the single-stage error extraction resistor circuit, and the other input serves as the negative input. The positive input of the single-stage error extraction resistor circuit is connected to the positive extraction signal output by the adjustable extraction signal circuit, and the negative input of the single-stage error extraction resistor circuit is connected to the negative clean signal output by the single-channel or multi-channel clean signal combining or splitting adjustment circuit. Alternatively, the single-stage error extraction inductor-capacitor circuit may be composed of an inductor connected to one input terminal of the combiner circuit in the single-stage error extraction resistor circuit, and a capacitor connected to the other input terminal of the combiner circuit. The inductor input terminal is the positive input terminal of the single-stage error extraction inductor-capacitor circuit, and the capacitor input terminal is the negative input terminal. The positive input terminal of the single-stage error extraction inductor-capacitor circuit is connected to the positive extraction signal output from the adjustable extraction signal circuit, and the negative input terminal is connected to the negative clean signal output from the single-channel or multi-channel clean signal combiner or splitter adjustment circuit. The two-stage error extraction circuit includes: a positive extraction signal output from the output of a corresponding adjustable extraction signal circuit connected to the positive input terminal of the first single-stage error extraction circuit; a positive or negative clean signal output from the first output terminal of a corresponding clean signal shunt adjustment circuit connected to the negative input terminal of the first single-stage error extraction circuit; and an operational amplifier, resistor, inductor, or capacitor circuit for two-stage error extraction. Wherein, when the operating voltage of the operational amplifier circuit in the error extraction matching negative feedback adjustable audio power amplifier circuit is less than the operating voltage of the main power amplifier circuit, the operational amplifier circuit connects the corresponding positive and negative power supply terminals, or the positive power supply terminal and ground terminal, respectively, with the same resistors that satisfy the operating voltage of the operational amplifier circuit connected in series between the positive and negative power supply terminals or between the positive power supply terminal and ground terminal; this achieves equal matching between the DC bias voltage at the input terminal of the error extraction circuit and the DC bias voltage at the output terminal of the adjustable signal extraction circuit and the output terminal of the clean signal adjustment circuit, and equal matching between the DC bias voltage at the output terminal of the error extraction circuit and the DC bias voltage at the feedback input terminal of the main differential circuit, and equal matching between the DC bias voltage at the output terminal of the pre-stage matching circuit and the DC bias voltage at the signal input terminal of the main differential circuit; this satisfies the bias midpoint voltage at the power signal output terminal of the main power output stage circuit, and meets the requirements of the main power amplifier circuit with low negative feedback not generating self-oscillation and operating stably. In the error extraction circuit, the difference between the main extracted signal output from the main power amplifier circuit and the clean signal output from the clean signal adjustment circuit is obtained by passing the audio signal through a direct circuit or a pre-stage matching circuit and the branch signal output from the main power amplifier circuit. This difference is used to evaluate the positive feedback main signal, feedback distortion, and noise signals output by the error extraction circuit. This ensures the stable operation of the low negative feedback main power amplifier circuit in the error extraction matched negative feedback adjustable audio power amplifier circuit. Furthermore, based on a determined main power amplifier circuit gain, this circuit achieves adjustable reduction of the main power signal output from the power signal output of the error extraction matched negative feedback adjustable audio power amplifier circuit, as well as maintaining or improving the input signal-to-noise ratio.

6. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, The preamp matching circuit includes: a preamp resistor matching circuit, a preamp operational amplifier matching circuit, and a preamp subtraction matching circuit, which are composed of resistors, a load circuit, an adjustable voltage divider resistor circuit, an audio branch circuit, an operational amplifier circuit, an operational amplifier subtraction circuit, and a branch circuit. The pre-stage resistor matching circuit is composed of an adjustable circuit of resistors or voltage divider resistors. The input terminal of the pre-stage resistor matching circuit is connected to the main signal output terminal of the audio branch circuit, and the output terminal of the pre-stage resistor matching circuit is connected to the signal input terminal of the main differential circuit. When the resistance in the pre-stage resistor matching circuit composed of resistors is zero ohms, it is a through circuit. The pre-amplifier matching circuit is composed of an operational amplifier circuit, or an operational amplifier circuit connected in series with a load circuit or a series voltage divider adjustable circuit. The input terminal of the pre-amplifier matching circuit is connected to the main signal output terminal of the audio splitter circuit, and the output terminal of the pre-amplifier matching circuit is connected to the signal input terminal of the main differential circuit. The pre-amplifier subtraction matching circuit is composed of two components: one output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit, or the other output of the shunt circuit is connected to the positive input of the operational amplifier subtraction circuit via the operational amplifier circuit; and the other output of the shunt circuit is connected to the negative input of the operational amplifier subtraction circuit via the adjustable voltage divider resistor circuit, or the other output of the shunt circuit is connected to the negative input of the operational amplifier circuit via the adjustable voltage divider resistor circuit in series. The input of the shunt circuit in the pre-amplifier subtraction matching circuit is connected to the main signal output of the audio shunt circuit, and the output of the pre-amplifier subtraction matching circuit is connected to the signal input of the main differential circuit. Specifically, by adjusting the resistors or voltage divider resistors in the pre-stage matching circuit, the audio signal output from the audio branch circuit and then from the pre-stage matching circuit to the main differential circuit signal input is made equal to the positive feedback main circuit signal output after subtracting the clean signal from the main circuit extracted signal in the error extraction circuit. This stabilizes the operation of the low negative feedback main circuit power amplifier in the error extraction matching negative feedback adjustable audio power amplifier circuit. Furthermore, based on a determined main circuit power amplifier gain, it achieves adjustable reduction of the main circuit distortion signal in the main circuit power signal output from the power signal output terminal of the error extraction matching negative feedback adjustable audio power amplifier circuit, while maintaining or improving the input signal-to-noise ratio.

7. The audio power amplifier circuit with adjustable error extraction matching negative feedback according to claim 1, characterized in that, By disconnecting the positive input terminal of the error extraction circuit from the corresponding output terminal of the adjustable extraction signal circuit, and disconnecting the negative input terminal of the error extraction circuit from the corresponding output terminal of the clean signal adjustment circuit, the positive input terminal of the error extraction circuit is connected to the output terminal of the clean signal adjustment circuit, and the negative input terminal of the error extraction circuit is connected to the output terminal of the adjustable extraction signal circuit. In this circuit, the negative input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive main path extraction signal output by the adjustable extraction signal circuit; the positive input of the single-stage or two-stage error extraction operational amplifier circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit; or the negative input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the negative main path extraction signal output by the adjustable extraction signal circuit; and the positive input of the single-stage or two-stage error extraction resistor or inductor-capacitor circuit is connected to the positive clean signal output by the single-channel or multi-channel clean signal combining adjustment circuit or split adjustment circuit. The modified error extraction circuit outputs a feedback negative main path signal, a feedback negative distortion signal, and a noise signal. The modified error extraction circuit outputs a feedback negative distortion signal and a noise signal. Simultaneously, the connection between the output of the error extraction circuit and the feedback input of the main differential circuit is disconnected. Instead, the output of the modified error extraction circuit is fed into the signal input of the main differential circuit via a connected capacitor. Furthermore, a branch feedback signal output is added to the power signal output of the main power amplifier circuit. This branch feedback signal output is connected to the input of a resistive negative feedback circuit composed of voltage divider resistors. The output of this resistive negative feedback circuit is then connected to the feedback input of the main differential circuit, forming a main power amplifier circuit with resistive negative feedback. This constitutes an error extraction input-adjustable negative feedback audio power amplifier circuit. By adjusting the feedback negative distortion signal extracted by the modified error extraction circuit and feeding it into the signal input terminal of the main differential circuit in the main power amplifier circuit with resistive negative feedback, the main distortion signal in the main power signal output terminal of the main power amplifier circuit with adjustable error extraction input is reduced in an adjustable manner.

8. A predistortion-cancelling audio power amplifier circuit, characterized in that, Includes the error extraction matched negative feedback adjustable audio power amplifier circuit according to any one of claims 1-7, wherein the predistortion cancelling audio power amplifier circuit include: Specifically, one output terminal of audio branch circuit one is connected to the input terminal of audio branch circuit two, and one output terminal of audio branch circuit two is connected to the input terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the input terminal of the branch power amplifier circuit with negative feedback. The branch power signal and branch distortion signal output from the branch power output terminal of the adjustable audio power amplifier circuit with branch error extraction matching negative feedback or the branch power amplifier circuit with negative feedback are connected to the ground terminal through the connected power load circuit. The branch power output terminal and the power load circuit... At the connection point, the output branch extraction signal and branch distortion signal; the positive or negative branch extraction signal, branch distortion signal and noise signal output by the connected adjustable extraction signal circuit are sent to the negative input terminal of the error extraction circuit; the positive clean signal, clean distortion signal and noise signal output by the connected clean signal adjustment circuit are sent to the positive input terminal of the error extraction circuit; the negative branch extraction signal in the error extraction circuit is subtracted from the positive clean signal, and the negative branch distortion signal and noise signal output by the error extraction circuit are connected to one input terminal of the combiner circuit; One output of the audio branch circuit is connected to a low-distortion or distortion-free pre-amplifier audio signal, which is then connected to another input of the combiner circuit. The output of the combiner circuit, based on the phase and amplitude characteristics of the synchronous audio signal and the negative branch distortion signal within the audio range, outputs a synchronous audio signal with pre-distortion characteristics. This negative branch distortion signal is then connected to the input of a main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or to the input of a main-path power amplifier circuit with negative feedback. The output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, or the output of the main-path error extraction and matching negative feedback adjustable audio power amplifier circuit, is then connected to the input of a main-path power amplifier circuit with negative feedback. The main power amplifier circuit amplifies the output terminal, and the main power signal output by the main power amplifier circuit includes the main power distortion signal and the negative branch distortion signal. At the output terminal of the main power amplifier circuit with adjustable negative feedback matching for main power error extraction, or at the output terminal of the main power signal of the main power amplifier circuit with negative feedback, when the time delay is close to equal, the amplitude is close to equal or close to similar overlap, and the phase is opposite or close to opposite, the main power distortion signal and the negative branch distortion signal in the main power signal are canceled out, thereby reducing the main power distortion signal in the main power signal output by the main power amplifier circuit with adjustable negative feedback matching for main power error extraction or the main power amplifier circuit with negative feedback. The branch distortion signal in the branch power signal output by the branch error extraction matching negative feedback adjustable audio power amplifier circuit or the branch power amplifier circuit with negative feedback, the negative branch distortion signal of the synchronous audio signal with pre-distortion characteristics output by the combining circuit, and the synchronous branch distortion signal output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power amplifier circuit with negative feedback are nearly identical or similar to the synchronous main distortion signal in the main power signal amplified and output by the main error extraction matching negative feedback adjustable audio power amplifier circuit or the main power signal amplified and output by the main power amplifier circuit with negative feedback. The audio power load circuit is composed of a capacitor that connects the resistor that matches and absorbs the power signal of the branch to ground.

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