Compensation circuit module, power amplifier component, compensation method and device

Abstract

The present disclosure provides a compensation circuit module, a power amplifier component, a compensation method and an apparatus. The compensation circuit module includes at least: a variable resistor, a detection component and a control component; the detection end of the detection component is connected to the DC blocking capacitor of the power amplifier for detecting the voltage swing of the input signal of the DC blocking capacitor; the control component is connected to the detection component for outputting a control signal according to the input signal detected by the detection component; the variable resistor is connected to the output end of the control component for changing the resistance connected to the power amplifier according to the control signal, and the resistance of the variable resistor connected to the power amplifier is used to constitute the feedback resistance of the power amplifier; the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve; the resistance of the variable resistor can be adjusted by the input signal to achieve compensation for the gain of the power amplifier and maintain the linearity of the input and output of the power amplifier.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technology, and more particularly to a compensation circuit module, a power amplifier component, a compensation method, and a device. Background Art

[0002] Existing power amplifiers use amplitude modulation to amplitude modulation distortion (AM-AM) and amplitude modulation to phase modulation distortion (AM-PM) to characterize the output power and adjacent communication band leakage ratio (ACLR) performance of the front-end power amplifier after amplification. The greater the rate of change of AM-AM and AM-PM with the input signal, the worse the ACLR of the power amplifier's output signal. The power amplifier's transistor voltage input signal output characteristics exhibit nonlinear characteristics when a large-amplitude signal is input (for example, a square-rate relationship for MOS transistors and an exponential-rate relationship for HBTs). The feedback resistor in existing power amplifiers has a fixed resistance. Therefore, when the input power increases, the power amplifier's gain, such as AM-AM and AM-PM, will decrease and compress. This unstable gain leads to nonlinear distortion in the power amplifier.

[0003] Existing compensation methods for nonlinear distortion include digital compensation methods or devices such as envelope tracking and digital pre-distortion. However, these methods or devices require external chips, have high manufacturing costs, and are complex to control. Therefore, there is a need for a compensation circuit module or gain compensation device that balances efficiency and effective gain compensation, while having a simple structure, easy integration into the same chip, and low manufacturing cost. Summary of the Invention

[0004] The present disclosure provides a compensation circuit module, a power amplifier component, a compensation method and a device.

[0005] According to a first aspect of the present disclosure, a compensation circuit module is provided, the compensation circuit module comprising at least: a variable resistor, a detection component, and a control component;

[0006] The detection component has a detection terminal connected to the DC blocking capacitor of the power amplifier and used to detect the voltage swing of the input signal of the DC blocking capacitor;

[0007] The control component is connected to the detection component and is used to output a control signal according to the input signal detected by the detection component;

[0008] The variable resistor is connected to the output end of the control component and is used to change the resistance connected to the power amplifier according to the control signal. The resistance of the variable resistor connected to the power amplifier is used to constitute the feedback resistance of the power amplifier; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

[0009] Optionally, the compensation circuit module also includes: an isolation resistor, which is connected to the output end of the control component and the input end of the variable resistor, and is used to change the resistance of the variable resistor connected to the power amplifier according to the control signal and the resistance of the isolation resistor.

[0010] Optionally, the control component includes at least: a first sub-control component and a second sub-control component, wherein the first sub-control component is connected to the detection component and is configured to output a first control current proportional to the input signal according to the input signal of the DC blocking capacitor;

[0011] The second sub-control component is connected to the rear end of the first sub-control component, and is configured to output a current control voltage inversely proportional to the first control current according to the first control current.

[0012] Optionally, the detector includes the detection component and the first sub-control component;

[0013] The detection component of the detector is used to detect the voltage swing of the input signal passing through the DC blocking capacitor;

[0014] The detector is connected to a first control power supply to form the first sub-control component, and the first control power supply is used to generate a first control voltage; the detector is also used to determine the power threshold based on the first control voltage; determine the voltage swing that meets the preset conditions based on the power threshold; and output the first control current based on the voltage swing that meets the preset conditions.

[0015] Optionally, the second sub-control component comprises at least: a voltage source, a voltage-controlled resistor, a second control power supply and a current mirror;

[0016] The current mirror is connected to the voltage-controlled resistor, and is configured to receive the first control current and mirror the first control current to the voltage-controlled resistor;

[0017] The voltage-controlled resistor is connected to a second control power supply, and the second control power supply outputs a second control voltage; wherein the second control voltage is used to control the resistance value of the voltage-controlled resistor;

[0018] The output end of the current-controlled voltage is arranged between the voltage-controlled resistor and the current mirror, and is used to output the current-controlled voltage; wherein the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

[0019] According to a second aspect of the present disclosure, a power amplification component is provided, comprising: a power amplifier and the compensation circuit module provided in the first aspect, wherein the power amplifier comprises at least: a DC blocking capacitor provided at a signal input terminal, a transistor, a bias circuit, a feedback circuit, and a DC blocking capacitor provided at a signal output terminal;

[0020] The first end of the feedback circuit is connected to the DC blocking capacitor at the signal input end, the bias circuit, and the gate of the transistor; the second end of the feedback circuit is connected to the DC blocking capacitor at the signal output end, and the drain of the transistor; the feedback resistor of the feedback circuit includes at least a fixed resistor and the variable resistor connected to the feedback circuit, and the fixed resistor and the variable resistor are used to constitute the feedback resistance of the power amplifier; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

[0021] According to a third aspect of the present disclosure, a compensation method is provided, wherein the compensation circuit module provided by the first aspect is used to compensate the gain of the power amplifier provided by the second aspect. The method includes:

[0022] detecting an input signal of the DC blocking capacitor by the detection component;

[0023] A control signal is outputted by the control component according to the input signal of the DC blocking capacitor; wherein the control signal is used to change the resistance connected to the power amplifier, and the feedback resistance formed by the resistance of the variable resistor connected to the power amplifier and the fixed resistor; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

[0024] Optionally, the method further includes:

[0025] The first sub-control component outputs a first control current proportional to the input signal according to the input signal of the DC blocking capacitor;

[0026] The second sub-control component outputs a current control voltage inversely proportional to the first control current according to the first control current.

[0027] Optionally, the method further includes:

[0028] The detector detects and outputs a first control current; wherein, the first control current is determined based on the voltage swing of the input signal of the DC blocking capacitor; the power threshold is determined based on the first control voltage; the power of the input signal is determined based on the voltage swing of the input signal, and if the power of the input signal meets the preset condition of being greater than the power threshold, the first control current is output; wherein, the first control current is proportional to the power of the input signal.

[0029] Optionally, the method further includes:

[0030] The current mirror receives the first control current and mirrors the first control current to the voltage-controlled resistor;

[0031] The second control power supply outputs a second control voltage; wherein the second control voltage is used to control the resistance value of the voltage-controlled resistor;

[0032] The output end of the current-controlled voltage is set between the voltage-controlled resistor and the current mirror to output the current-controlled voltage; wherein the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

[0033] According to a fourth aspect of an embodiment of the present disclosure, a device is provided, comprising:

[0034] Memory;

[0035] The processor is connected to the memory and is used to execute instructions stored in the memory by a computer, so as to realize the steps of the compensation method provided in the third aspect. The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: the compensation circuit module provided by the embodiment of the present disclosure at least includes: a variable resistor, a detection component and a control component; the detection end of the detection component is connected to the DC blocking capacitor of the power amplifier, and is used to detect the voltage swing of the input signal of the DC blocking capacitor; the control component is connected to the detection component, and is used to output a control signal according to the input signal detected by the detection component; in this way, the detection component can determine the need to output a control signal according to the input signal according to the parameters of the input signal, and then adjust the resistance value of the variable resistor according to the specific situation of the input signal; the variable resistor is connected to the output end of the control component, and is used to change the voltage swing of the input signal connected to the power amplifier according to the control signal. The resistance value in the device, the resistance value of the variable resistor connected to the power amplifier, is used to constitute the feedback resistance value of the power amplifier; wherein, the feedback resistance value is used to increase when the gain of the power amplifier decreases; the increased feedback resistance value is used to keep the gain in the flat section of the gain change curve; thus, compared with the fixed feedback resistance value in the existing power amplifier, the resistance value of the variable resistor constitutes the feedback resistance value of the power amplifier, and the gain of the power amplifier can be compensated by adjusting the resistance value of the variable resistor, so that the gain is stable, the linearity of the output characteristic of the transistor voltage input signal of the power amplifier is maintained under the condition of large-amplitude signal input, and the nonlinear distortion of the power amplifier is prevented.

[0036] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A circuit diagram of a conventional power amplifier;

[0038] Figure 2 A conventional curve diagram showing the change of gain AM-AM with the resistance value of the feedback resistor;

[0039] Figure 3 is a structural diagram of a supplementary circuit module according to an exemplary embodiment;

[0040] Figure 4 is a structural diagram of a supplementary circuit module according to an exemplary embodiment;

[0041] Figure 5 is a structural diagram of a supplementary circuit module according to an exemplary embodiment;

[0042] Figure 6 is a schematic diagram of the circuit structure of a supplementary circuit module according to an exemplary embodiment;

[0043] Figure 7 is a schematic diagram of the circuit structure of a supplementary circuit module according to an exemplary embodiment;

[0044] Figure 8 A simplified schematic diagram of the circuit structure of a supplementary circuit module is shown as an exemplary embodiment;

[0045] Figure 9 FIG1 is a schematic diagram showing a change in a first control current Ic of a supplementary circuit module along with a power amplifier input power Pin according to an exemplary embodiment;

[0046] Figure 10 FIG1 is a schematic diagram showing a change in a current control voltage Vc of a supplementary circuit module along with a first control current Ic according to an exemplary embodiment;

[0047] Figure 11 Schematic diagram showing how the resistance value Requ of the variable resistor of the supplementary circuit module changes with the control voltage Vc1 according to an exemplary embodiment;

[0048] Figure 12 Schematic diagram showing how the feedback resistance Rtotal of the supplementary circuit module changes with the control voltage Vc1 according to an exemplary embodiment;

[0049] Figure 13 Schematic diagram showing how the feedback resistance Rtotal of the supplementary circuit module changes with the input power Pin of the power amplifier according to an exemplary embodiment;

[0050] Figure 14 FIG1 is a schematic diagram showing a change in the gain AM-AM of a power amplifier along with a first control voltage Vcon1 according to an exemplary embodiment;

[0051] Figure 15 FIG1 is a schematic diagram showing a change in the gain AM-AM of a power amplifier along with a first control voltage Vcon2 according to an exemplary embodiment;

[0052] Figure 16 A schematic diagram of a circuit structure of a variable resistor according to an exemplary embodiment;

[0053] Figure 17 A schematic diagram of a circuit structure of a variable resistor according to an exemplary embodiment;

[0054] Figure 18 A schematic diagram of a circuit structure of a variable resistor according to an exemplary embodiment;

[0055] Figure 19 A curve diagram of a variable resistor is shown in an exemplary embodiment;

[0056] Figure 20This is a schematic structural diagram of a power amplification component shown in an exemplary embodiment;

[0057] Figure 21 This is a schematic diagram of the circuit structure of a power amplifier component according to an exemplary embodiment;

[0058] Figure 22 A schematic flow chart of a compensation method according to an exemplary embodiment;

[0059] Figure 23 A schematic flow chart of a compensation method according to an exemplary embodiment;

[0060] Figure 24 The figure is a flowchart of a compensation method according to an exemplary embodiment. DETAILED DESCRIPTION

[0061] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present disclosure, as detailed in the accompanying application documents.

[0062] The circuit of the existing power amplifier is as follows Figure 1 As shown in the figure, the mirror bias circuit composed of NMOS tube M1, filter capacitor C1, isolation resistor Rb and current source provides DC bias current to the power tube. The function of DC blocking capacitors Cb1 and Cb2 is to feed in and out RF signals and isolate DC. Through the RF signal, VDD is the working voltage supply terminal and provides current Id; the feedback circuit composed of DC blocking capacitors Cf1, Cf2 and feedback resistor R2 realizes the control of transistor M2 gain and stability. The smaller the value of feedback resistor R2, the deeper the negative feedback and the lower the amplifier gain. The AM-AM curve of the power amplifier changes with the feedback resistor R2 as shown in the figure. Figure 2 As shown in the figure, P1dB is the 1dB gain compression point, and Psat is the saturation power of the power amplifier. The linear power of the amplifier is largely limited by the nonlinear distortion of the transistors, resulting in AM-AM rolloff (i.e., a significant drop in gain) and ACLR degradation. In the context of multi-band, multi-mode mobile terminal applications, it is difficult to fully cover the operating bandwidth of the power amplifier through external matching. Repeated iteration and compromise optimization across different frequency bands are required, resulting in low development efficiency.

[0063] The present disclosure provides a compensation circuit module 100, which is combined with Figure 3 As shown, the compensation circuit module 100 at least includes: a variable resistor 101, a detection component 102 and a control component 103;

[0064] The detection component 102 has a detection terminal connected to the DC blocking capacitor 201 of the power amplifier 200 and configured to detect a voltage swing of an input signal of the DC blocking capacitor 201;

[0065] The control component 103 is connected to the detection component 102 and is used to output a control signal according to the input signal detected by the detection component 102;

[0066] The variable resistor 101 is connected to the output end of the control component 103 and is used to change the resistance connected to the power amplifier 200 according to the control signal. The resistance of the variable resistor connected to the power amplifier is used to constitute the feedback resistance of the power amplifier; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

[0067] In the embodiment of the present disclosure, the detection component 102 is a component capable of detecting an input signal, including but not limited to: a detector, a galvanometer, or a power meter.

[0068] In the embodiment of the present disclosure, the detection end of the detection component 102 is connected to the DC blocking capacitor 201 of the power amplifier, and is used to detect the voltage swing of the input signal passing through the DC blocking capacitor 201 .

[0069] In one embodiment, the input signal refers to a radio frequency signal that can pass through the DC blocking capacitor 201. The detection end of the detection component 102 can detect and obtain parameters of the input signal, and is used to determine whether it is necessary to enable the control component 103 to output a control signal for the input signal based on the parameters of the input signal.

[0070] In the embodiment of the present disclosure, the detection end of the detection component 102 detects and obtains parameters of the input signal, including but not limited to: voltage parameters of the input signal, current parameters of the input signal, and power parameters of the input signal.

[0071] In the embodiment of the present disclosure, the control component 103 is connected to the detection component 102 and is used to output a control signal based on the input signal detected by the detection component 102. After the control component 103 is connected to the detection component 102, it will receive the current or voltage signal output by the detection component 102, and the control component 103 will output a control signal based on the current or voltage signal output by the detection component 102.

[0072] In the embodiment of the present disclosure, the variable resistor 101 is connected to the control component 103 , and the control signal output by the control component 103 is used to change the resistance value of the variable resistor 101 .

[0073] In one embodiment, the control signal is output in the form of a voltage, and the variable resistor 101 is a voltage-variable resistor, that is, the variable resistor 101 changes with the change of the input voltage. When the control signal is output in the form of a voltage, the resistance of the variable resistor 101 changes with the change of the voltage. In some embodiments, the change in the resistance of the variable resistor 101 is directly proportional or inversely proportional to the change in the voltage.

[0074] In the embodiment of the present disclosure, Figure 1 and Figure 3 As shown, in the feedback circuit of the power amplifier 200, the existing technical solution is to set a fixed resistor R2. In the embodiment of the present disclosure, a variable resistor 101 is set to be connected to the feedback circuit and connected to the fixed resistor R2. The connection relationship between the variable resistor 101 and the fixed resistor R2 is not limited to series or parallel connection, and can also be a mixed connection when there are multiple variable resistors and multiple fixed resistors.

[0075] The number of variable resistors 101 can be one or more, and the number of fixed resistors R2 can be one or more. The embodiments of the present disclosure are not limited to the figures. As long as the variable resistor 101 is connected to the feedback circuit of the power amplifier, the resistance of the variable resistor 101 and the resistance of the fixed resistor R2 together constitute the feedback resistance of the power amplifier, the feedback resistance is variable, and the magnitude of the feedback resistance satisfies the requirement that it increases with the power of the input signal, the manner in which the variable resistor 101 is connected to the power amplifier, and the relationship between the variable resistor 101 and the control signal are not limited to the above embodiments.

[0076] In one embodiment, the inherent fixed resistance R2 of the power amplifier can even be directly replaced by the variable resistor 101 .

[0077] In one embodiment, the control signal is a voltage signal. When the voltage value of the control signal is inversely proportional to the power of the input signal, the feedback resistance is also inversely proportional to the control signal, which ultimately ensures that the feedback resistance is proportional to the power of the input signal.

[0078] In another embodiment, the control signal is a voltage signal. When the voltage value of the control signal is in direct proportion to the power of the input signal, the feedback resistance is also in direct proportion to the control signal, and ultimately the feedback resistance is also in direct proportion to the power of the input signal.

[0079] In the embodiment of the present disclosure, the variable resistor 101 is a voltage-controlled resistor, and when the control signal output by the control component 103 is a voltage signal, the resistance of the voltage-controlled resistor is in direct proportion to the voltage value of the control signal, such as linear, piecewise linear, square, or exponential.

[0080] In the embodiment of the present disclosure, Figure 2As shown, after the variable resistor 101 constitutes the feedback resistance of the power amplifier 200, the gain AM-AM of the power amplifier enters a decreasing region due to an increase in the parameters of the input RF signal, such as power. Therefore, the feedback resistance of the feedback resistor is increased through the variable resistor 101, thereby increasing the gain to maintain it in the flat section of the gain change curve.

[0081] In the disclosed embodiment, the compensation circuit module changes the gain by adjusting the resistance of a variable resistor. The module can also detect input signal parameters to determine whether a control signal needs to be output. For example, when the input signal parameter is below a threshold, the gain is in a flat range, equivalent to a stable gain state, and there is no need to output a control signal to change the resistance of the variable resistor. Only when the input signal parameter is above the threshold and the gain is in a decreasing range, can a control signal be output through the control component to change the resistance of the variable resistor, thereby increasing the gain when it is about to decrease to maintain it in the flat range, thereby achieving gain compensation for the power amplifier, keeping the input and output of the power amplifier's transistors in a linear range, and preventing nonlinear distortion of the power amplifier.

[0082] In the embodiment of the present disclosure, Figure 4 As shown, the compensation circuit module also includes: an isolation resistor 104, which is connected to the output end of the control component 103, and the isolation resistor 104 is connected to the input end of the variable resistor 101, and is used to change the resistance of the variable resistor 101 connected to the power amplifier 200 according to the control signal and the resistance of the isolation resistor 104.

[0083] In the embodiment of the present disclosure, when the control signal output by the control component 103 is a voltage signal and the variable resistor 101 is a voltage-controlled resistor, the isolation resistor 104 is connected in series with the variable resistor 101 to block the radio frequency signal on the variable resistor 101 from leaking to the control component 103, thereby changing the resistance value of the variable resistor 101 by changing the voltage value of the variable resistor 101.

[0084] In the embodiment of the present disclosure, the control component includes at least: a first sub-control component 1031 and a second sub-control component 1032, wherein the first sub-control component 1031 is connected to the detection component 102 and is configured to output a first control current proportional to the input signal according to the input signal of the DC blocking capacitor;

[0085] The second sub-control component 1032 is connected to the rear end of the first sub-control component 1031, and is configured to output a current control voltage inversely proportional to the first control current according to the first control current.

[0086] In the embodiment of the present disclosure, the first sub-control component 1031 is connected to the detection component 102, and the first control current Ic output by the first control sub-component 1031 is proportional to the power of the input signal. The first output current Ic can be in a linear, piecewise linear, square, exponential or other proportional relationship with the input power Pin.

[0087] In the embodiment of the present disclosure, the second sub-control component 1032 is connected to the rear end of the first sub-control component 1031 and is configured to output a current control voltage Vc inversely proportional to the first control current Ic according to the first control current Ic.

[0088] In the embodiment of the present disclosure, the first sub-control component 1031 is also connected to the first control voltage source, and is used to receive the voltage Vcon1 output by the first control voltage source. The power threshold Poffset of the input power Pin is determined by the voltage Vcon1 output by the first control voltage source. When Vcon1 is larger, the power threshold Poffset is lower, and the power starting point Poffset at which the detection component 102 starts to detect the input signal is lower. In this way, the input signal can be detected as early as possible, reducing the situation where the power amplifier drops prematurely.

[0089] In one embodiment, the second sub-control component 1032 can be a programmable current-controlled voltage source. Through the programmable current-controlled voltage source, the above-mentioned current-controlled voltage Vc and the first control current Ic are in a decreasing functional relationship. Vc and Ic can be in an inverse proportional relationship such as linear, piecewise linear, square, exponential, etc. Taking the linear relationship as an example, the proportional coefficient is programmable and adjustable by the second control voltage Vcon2, and the upper limit of the current-controlled voltage Vc is limited by the voltage source Vlimit, so that Vc is in a decreasing functional relationship with the input signal Ic.

[0090] In the embodiment of the present disclosure, the first sub-control component 1031 can be used to determine the output first control current Ic based on the parameters of the input signal; the second sub-control component 1032 can be used to output a current control voltage Vc that is inversely proportional to the first control current Ic based on the first control current Ic. The current control voltage Vc can adjust the resistance value of the variable resistor 101 when it is a voltage-controlled resistor, thereby playing a role in adjusting the gain of the power amplifier.

[0091] In the embodiment of the present disclosure, Figure 6 As shown, the detector includes the detection component and the first sub-control component;

[0092] The detection component of the detector is used to detect the voltage swing of the input signal passing through the DC blocking capacitor;

[0093] The detector is connected to a first control power supply to form the first sub-control component, and the first control power supply is used to generate a first control voltage; the detector is also used to determine the power threshold based on the first control voltage; determine the voltage swing that meets the preset conditions based on the power threshold; and output the first control current based on the voltage swing that meets the preset conditions.

[0094] In the embodiment of the present disclosure, the detection component of the detector detects the input signal passing through the DC blocking capacitor, determines the voltage swing of the input signal, and determines the power value Pin according to the voltage swing, that is, obtains the input power value Pin of the power amplifier.

[0095] In the embodiment of the present disclosure, the input signal is a radio frequency signal.

[0096] In the embodiment of the present disclosure, a detector for detecting that the input signal is a radio frequency signal may be a radio frequency detector, including but not limited to: a zero-bias Schottky diode detector, a biased Schottky diode detector, a logarithmic detector, etc.

[0097] In the embodiment of the present disclosure, the RF detector can accurately detect and measure the amplitude and power of the RF signal. When the RF detector detects the RF signal, it will output a voltage value, which is proportional to the power of the input signal, and based on this output voltage value, it can correspond to the input power value.

[0098] In one embodiment, the RF detector detects the voltage swing U of the RF signal passing through the DC blocking capacitor, and the node resistance is R. Then, according to the formula P=U 2 / R, the corresponding power value of the input RF signal can be calculated.

[0099] In the embodiments of the present disclosure, the detector is further connected to a logic controller and / or an intelligent terminal having the function of performing the judgment step, including but not limited to: the logic controller such as a controller or a single-chip microcomputer, and the intelligent terminal such as a smart phone or a computer; the logic controller and / or the intelligent terminal obtains the voltage swing of the determined input signal of the detector, determines the power Pin of the input signal according to the voltage swing, and determines the first control voltage Vcon1 generated by the first control power supply connected to the detector according to the power Pin of the input signal. Moreover, the greater the value of the first control voltage Vcon1 determined by the logic controller and / or the intelligent terminal, the lower the determined power threshold Poffset; the logic controller and / or the intelligent terminal compares the power Pin of the input signal with the power threshold Poffset according to the obtained power Pin of the input signal determined by the detector. If the power Pin of the input signal is higher than the power threshold Poffset, it is determined that the input signal meets the preset conditions; the logic controller and / or the intelligent terminal controls the detector to output a first control current Ic.

[0100] In the embodiments of the present disclosure, the logic controller and / or the intelligent terminal can obtain the power of the input signal through the detector, and determine the magnitude of the power threshold Poffset by setting different first control voltages Vcon1.

[0101] In one embodiment, the user or the designer can also determine different first control voltages Vcon1 through the logic controller and / or the intelligent terminal according to personal experience.

[0102] In one embodiment, it can also be that the controller obtains the power value at the gain drop point of the power amplifier and automatically determines the corresponding first control voltage Vcon1.

[0103] In the embodiments of the present disclosure, regarding the relationship between the first control current Ic, the input power Pin, the power threshold Poffset, and the first control voltage Vcon1, it can be combined with Figure 9 As shown, the greater the first control voltage Vcon1, the smaller the power threshold Poffset, such as Poffset1 < Poffset2 < Poffset3. The output first control current Ic starts from the power threshold Poffset and increases as the input power Pin increases.

[0104] In the disclosed embodiment, the power threshold Poffset is determined by setting the first control voltage Vcon1. This determines the maximum increase in input power required to compensate for gain as the input signal power increases. This eliminates the need for constant gain compensation; it only needs to be determined when the gain is sufficiently high. This saves computational or control resources while still enabling accurate gain compensation.

[0105] In the embodiment of the present disclosure, Figure 7 as well as Figure 8 As shown, the second sub-control component 1032 includes at least: a voltage source Vlimit, a voltage-controlled resistor Rv, a second control power supply and a current mirror;

[0106] The current mirror is connected to the voltage-controlled resistor, and is configured to receive the first control current and mirror the first control current to the voltage-controlled resistor;

[0107] The voltage-controlled resistor is connected to a second control power supply, and the second control power supply outputs a second control voltage; wherein the second control voltage is used to control the resistance value of the voltage-controlled resistor;

[0108] The output end of the current-controlled voltage is arranged between the voltage-controlled resistor and the current mirror, and is used to output the current-controlled voltage; wherein the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

[0109] In the embodiment of the present disclosure, the current mirror is composed of a 1:1 current mirror consisting of a transistor M3 and a transistor M4, and a transistor M5 and a transistor M6. The transistor M3 receives a first control current Ic, and the first control current is mirrored to the voltage-controlled resistor Rv through the current mirror. The second control power supply is connected to the voltage-controlled resistor Rv, and the second control voltage Vcon2 output by the second control power supply is used to control the resistance value of the voltage-controlled resistor Rv.

[0110] In the embodiment of the present disclosure, the current control voltage Vc=Vlimit-Rv*Ic, so that the upper limit of the output voltage of Vc is limited by the voltage Vlimit output by the voltage source, and the relationship between the second control voltage Vcon2 and the voltage-controlled resistor Rv is in direct proportion. When Vcon2 is larger, the resistance value of the voltage-controlled resistor Rv connected to the circuit is larger. Its simplified equivalent circuit is as follows: Figure 8 shown.

[0111] In the embodiment of the present disclosure, Figure 10As shown in the formula Vc=Vlimit-Rv*Ic, Vcon2 is directly proportional to the voltage-controlled resistor Rv, so Vcon2 can control the proportional relationship between Vc and Ic, thereby controlling the amplitude of the variable resistor 101 changing with the input power.

[0112] In the embodiment of the present disclosure, the equivalent resistance value Requ of the variable resistor 101 can be in inverse proportion to the current control voltage Vc, such as linear, square, or exponential. Taking the linear relationship as an example, the equivalent resistance Requ changes with the change of the resistance control voltage Vc1, such as Figure 11 shown.

[0113] In the embodiment of the present disclosure, after the variable resistor 101, i.e., D1, controlled by the compensation circuit component 100 is connected to the feedback circuit of the power amplifier 200, the total feedback resistance can be expressed as Rtotal = R2 + Requ, where R2 is a fixed resistance with a unit order of about 100 ohms. This is to avoid the situation where the equivalent resistance of D1 is too small under low power input conditions, resulting in too deep feedback and too low low power signal gain. The curve of Rtotal resistance changing with the resistance control voltage Vc1 is as follows: Figure 12 shown.

[0114] In the embodiments of the present disclosure, combined with the above embodiments and Figure 9 、 Figure 10 、 Figure 11 as well as Figure 12 As shown, Figure 9 It shows that the first control current Ic output by the first sub-control component 1031 is in direct proportion to the power of the input signal. Figure 10 It shows that the control signal of the second sub-control component 1032, such as the current control voltage Vc, is in inverse proportion to the first control current Ic. Figure 11 It shows that after the current control voltage Vc is divided by the isolation resistor 104, the output resistance control voltage Vc1 is output. The equivalent resistance Requ of the variable resistor 101 decreases as the voltage Vc1 increases. Figure 12 It shows that the feedback resistance Rtotal = R2 + Requ decreases as the voltage Vc1 increases, from the maximum value Rmax of Requ to zero. In this way, the relationship between the feedback resistance Rtotal and the input power Pin can be made as follows: Figure 13 As shown, the improvement effect of the AM-AM curve of the first control voltage Vcon1 and the second control voltage Vcon2 is as follows: Figure 14 、 Figure 15As shown, Vcon1 is used to determine the starting power point Poffset for the compensation gain, and Vcon2 is used to control the magnitude of the feedback depth decreases with input power. Vcon1 and Vcon2 are controlled by a wired or wireless external device with executable logic control, such as a single-chip microcomputer or a smart terminal with controller and communication capabilities. The smart terminal or logic control device can be programmed to make targeted adjustments based on the AMAM curve at different frequencies, ensuring that the power amplifier meets good ACLR requirements across a wide operating frequency band. This allows gain compensation to be achieved across the gain curve at different frequencies. During pre-gain reduction, the gain is increased by increasing the feedback resistance, ensuring that the increased gain remains within the flat portion of the gain curve, thereby ensuring the linearity of the power amplifier and mitigating linear distortion.

[0115] In the embodiments of the present disclosure, the structure of the variable resistor includes but is not limited to: Figure 16 The fixed resistor shown is connected in parallel with one or more voltage-controlled variable resistors; Figure 17 The fixed resistor shown is connected in parallel with one or more circuits including switches and fixed resistors; if Figure 18 The transistor shown is connected in parallel with a fixed resistor.

[0116] In the embodiments of the present disclosure, Figure 18 In the variable resistor structure composed of the transistor and the fixed resistor in parallel, the transistor works as shown in FIG. Figure 19 In the linear region shown, the equivalent resistance Ron decreases as the voltage increases from Vth, so that the equivalent resistance is in a linear inverse proportional relationship with the voltage Vc1.

[0117] In the embodiments of the present disclosure, the structure of the variable resistor is not limited to the above embodiments, and any series or parallel structure that implements the variable resistor is within the scope of implementation of the present application.

[0118] Combine Figure 20 as well as Figure 21 As shown, an embodiment of the present disclosure provides a power amplification component 300, comprising: a power amplifier 200 and the compensation circuit module 100 in the aforementioned embodiment, wherein the power amplifier 200 at least comprises: a DC blocking capacitor Cb1 arranged at a signal input end, a transistor M2, a bias circuit 202, a feedback circuit 203, and a DC blocking capacitor Cb2 arranged at a signal output end;

[0119] A first end of the feedback circuit 203 is connected to the DC blocking capacitor 201 at the signal input end, the bias circuit 202, and the gate of the transistor M2; a second end of the feedback circuit 203 is connected to the DC blocking capacitor Cb2 at the signal output end, and the drain of the transistor M2; the feedback resistor of the feedback circuit 203 includes at least a fixed resistor and the variable resistor 101 connected to the feedback circuit 203, and the fixed resistor R2 and the variable resistor 101 are used to constitute the feedback resistance of the power amplifier 200; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to maintain the gain in the flat section of the gain change curve.

[0120] In the embodiment of the present disclosure, the compensation circuit component 100 is used to compensate for the gain of the power amplifier 200. The compensation resistor component 100 is used to change the feedback resistance in the feedback circuit of the power amplifier according to the input signal of the power amplifier 200. When the gain of the power amplifier decreases significantly due to a significant increase in power, the feedback resistance will increase. The increased feedback resistance is used to keep the gain in the flat section of the gain change curve, such as Figure 14 、 Figure 15 shown.

[0121] In the embodiment of the present disclosure, in the power amplifier, the bias circuit 202 includes an NMOS transistor M1, a current source Ib, and an isolation resistor Rb for providing a bias current to the transistor M2, and the feedback circuit is connected to the signal output terminal RFout and the signal input terminal RFin of the power amplifier, and is used to provide feedback resistance to the power amplifier to compensate for the gain of the power amplifier. The feedback resistance formed by the variable resistor 101 can dynamically compensate for the gain of the power amplifier.

[0122] In the embodiment of the present disclosure, the function of the DC blocking capacitors Cb1 and Cb2 is to feed in and out the RF signal, isolate the DC, and pass the RF signal; the feedback circuit composed of the DC blocking capacitors Cf1 and Cf2, the feedback resistor R2, and the variable resistor D1 and the fixed resistor R2 controlled by the compensation resistor component 100 realizes the control of the gain and stability of the transistor M2. The variable resistor D1 and the fixed resistor R2 form a feedback resistance. The larger the feedback resistance, the shallower the negative feedback, and the lower the gain of the power amplifier.

[0123] In the disclosed embodiments, a power amplifier can change its gain by adjusting the resistance of a variable resistor within a pre-set communication frequency band. The power amplifier can also detect input signal parameters to determine whether a control signal needs to be output. For example, when the input signal parameter is below a threshold, the gain is in a flat range and stable, so there is no need to output a control signal to change the resistance of the variable resistor. Only when the input signal parameter is above the threshold and the gain is in a decreasing range can a control signal be output through a control component to change the resistance of the variable resistor, thereby increasing the gain when it is about to decrease to maintain it in the flat range, thereby achieving gain compensation for the power amplifier, keeping the input and output of the power amplifier's transistors in a linear range, and preventing nonlinear distortion of the power amplifier.

[0124] The present disclosure provides a compensation method, combining Figure 22 As shown, the gain of the power amplifier is compensated by using the compensation circuit module, and the method includes:

[0125] Step S401, detecting an input signal of the DC blocking capacitor by the detection component;

[0126] In step S402, the control component outputs a control signal according to the input signal of the DC blocking capacitor; wherein the control signal is used to change the resistance connected to the power amplifier, and the feedback resistance formed by the resistance of the variable resistor connected to the power amplifier and the fixed resistor; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

[0127] In the embodiment of the present disclosure, the steps of the compensation method are executed by a logic controller or an intelligent terminal that can be electrically connected or communicatively connected to the power amplifier; the logic control device can be but is not limited to a single-chip microcomputer or a controller, and the intelligent terminal can be but is not limited to: a smart phone or a computer; the steps of the compensation method are executed by programming control.

[0128] In the disclosed embodiment, in step S401, the detection component detects parameters of the input signal of the DC blocking capacitor, including but not limited to the current parameter, voltage parameter, and time period of the input signal. The logic controller or intelligent terminal uses the parameters of the input signal detected by the detection component to calculate and determine the power of the input signal.

[0129] In an embodiment of the present disclosure, in step S402, the logic controller or intelligent terminal outputs a control signal through the control component according to the input signal of the DC blocking capacitor. The control signal is used to change the resistance of the variable resistor 101, thereby changing the gain of the power amplifier, so that the gain of the power amplifier is maintained in the flat section of the gain change curve.

[0130] In the embodiment of the present disclosure, the detection component of the compensation circuit module is controlled to obtain the parameters of the input signal, and then the control component of the compensation circuit module is controlled to output a control signal to the variable resistor 101 according to the input signal, thereby controlling the resistance value of the variable resistor.

[0131] In the disclosed embodiment, by changing the resistance value of the variable resistor, the gain is stabilized in the flat section of the gain change curve, thereby achieving gain compensation for the power amplifier, so that the input and output of the transistor of the power amplifier are in the linear range, thereby preventing linear distortion of the power amplifier.

[0132] In the embodiment of the present disclosure, Figure 23 As shown, the method further includes:

[0133] Step S403: the first sub-control component outputs a first control current proportional to the input signal according to the input signal of the DC blocking capacitor;

[0134] Step S404: the second sub-control component outputs a current control voltage inversely proportional to the first control current according to the first control current.

[0135] In the embodiment of the present disclosure, Figure 3 、 Figure 5 、 Figure 6 as well as Figure 23 As shown, in the step S403, the first sub-control component 1031 outputs a control current Ic that is proportional to the power of the input signal according to the input signal input by the DC blocking capacitor 201. The first output current Ic can be in a linear, piecewise linear, square, exponential or other proportional relationship with the input power Pin.

[0136] In the embodiment of the present disclosure, the second sub-control component 1032 is configured to output a current control voltage Vc inversely proportional to the first control current Ic according to the first control current Ic.

[0137] In the embodiment of the present disclosure, the first sub-control component 1031 is also connected to the first control voltage source, and is used to receive the voltage Vcon1 output by the first control voltage source. The power threshold Poffset of the input power Pin is determined by the voltage Vcon1 output by the first control voltage source. When Vcon1 is larger, the power threshold Poffset is lower, and the power starting point Poffset at which the detection component 102 starts to detect the input signal is lower. In this way, the input signal can be detected as early as possible to avoid the power amplifier from dropping too early.

[0138] In the embodiment of the present disclosure, a logic controller or an intelligent terminal is connected to the first control voltage source of the compensation circuit module 100 to control the voltage Vcon1 output by the first control voltage source, and to determine the relationship between the Vcon1 and the power threshold Poffset. The larger the Vcon1, the lower the power threshold Poffset. In this way, the input signal can be detected as early as possible to avoid the power amplifier from dropping too early.

[0139] In the embodiment of the present disclosure, the second sub-control component 1032 can be a programmable current-controlled voltage source. Through the programmable current-controlled voltage source, the above-mentioned current-controlled voltage Vc and the first control current Ic are in a decreasing functional relationship. Vc and Ic can be in an inverse proportional relationship such as linear, piecewise linear, square, exponential, etc. Taking the linear relationship as an example, the proportional coefficient is programmable and adjustable by the second control voltage Vcon2, and the upper limit of the current-controlled voltage Vc is limited by the voltage source Vlimit, so that Vc is in a decreasing functional relationship with the input signal Ic.

[0140] In an embodiment of the present disclosure, a logic controller or an intelligent terminal is connected to the second control voltage source of the compensation circuit module, and is used to control the second control voltage source to output a second control voltage Vcon2 to the second control sub-component, and the second control voltage Vcon2 is used to control the current control voltage output by the second sub-control component.

[0141] In the embodiment of the present disclosure, the first sub-control component 1031 can be used to determine the output first control current Ic based on the parameters of the input signal; the second sub-control component 1032 can be used to output a current control voltage Vc that is inversely proportional to the first control current Ic based on the first control current Ic. The current control voltage Vc can adjust the resistance value of the variable resistor 101 when it is a voltage-controlled resistor, thereby playing a role in adjusting the gain of the power amplifier.

[0142] In the embodiment of the present disclosure, Figure 24 As shown, the method further includes:

[0143] Step S405: the detector detects and outputs a first control current; wherein the first control current is determined according to the voltage swing of the input signal of the DC blocking capacitor;

[0144] Step S406, determining the power threshold according to the first control voltage;

[0145] Step S407, determining the power of the input signal based on the voltage swing of the input signal, and outputting the first control current if the power of the input signal satisfies a preset condition of being greater than the power threshold; wherein the first control current is proportional to the power of the input signal.

[0146] In the embodiment of the present disclosure, the detection component of the detector detects the voltage swing of the input signal passing through the DC blocking capacitor, and determines the power value Pin of the input signal according to the voltage swing, that is, obtains the input power value Pin of the power amplifier.

[0147] In an embodiment of the present disclosure, the detector is also connected to a logic controller and / or an intelligent terminal having the function of executing a judgment step, including but not limited to: a logic controller such as a controller, a single-chip microcomputer, and an intelligent terminal such as a smart phone or a computer; the logic controller and / or the intelligent terminal obtains the voltage swing of the input signal determined by the detector, determines the power Pin of the input signal based on the voltage swing, and determines the first control voltage Vcon1 generated by the first control power supply connected to the detector based on the power Pin of the input signal, and the logic controller and / or the intelligent terminal determines that the larger the value of the first control voltage Vcon1, the lower the power threshold Poffset; the logic controller and / or the intelligent terminal compares the power Pin of the input signal with the power threshold Poffset based on the power Pin of the input signal determined by the detector, and if the power Pin of the input signal is higher than the power threshold Poffset, it is determined that the input signal meets the preset condition; the logic controller and / or the intelligent terminal controls the detector to output the first control current Ic.

[0148] In the embodiment of the present disclosure, the logic controller and / or the intelligent terminal may obtain the power of the input signal through a detector, and determine the size of the power threshold Poffset by setting different first control voltages Vcon1.

[0149] In one embodiment, different first control voltages Vcon1 may also be determined by a user or designer based on personal experience through a logic controller and / or an intelligent terminal.

[0150] In one embodiment, the controller may obtain a power value at a gain drop point of the power amplifier and automatically determine the corresponding first control voltage Vcon1.

[0151] In the embodiments of the present disclosure, regarding the relationship between the first control current Ic, the input power Pin, the power threshold Poffset, and the first control voltage Vcon1, it can be combined with Figure 9 As shown, the larger the first control voltage Vcon1, the smaller the power threshold Poffset, such as Poffset1 < Poffset2 < Poffset3. The output first control current Ic starts from the power threshold Poffset and increases with the increase of the input power Pin.

[0152] In the embodiments of the present disclosure, by setting the first control voltage Vcon1, the power threshold Poffset is determined, and further, in the process of the increase of the input power of the input signal, it is determined how much the input power increases to determine the compensation for the gain. In this way, it is not necessary to compensate the gain at all times, and only when the gain is large enough, it is determined to compensate the gain of the power amplifier. In this way, the resources required for calculation or control can be saved, and the gain can be accurately compensated.

[0153] In the embodiments of the present disclosure, the method further includes:

[0154] The current mirror receives the first control current and mirrors the first control current to the voltage-controlled resistor;

[0155] The second control power supply outputs a second control voltage; wherein, the second control voltage is used to control the resistance value of the voltage-controlled resistor;

[0156] The output end of the current-controlled voltage is arranged between the voltage-controlled resistor and the current mirror to output the current-controlled voltage; wherein, the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

[0157] The current mirror is composed of transistor M3 and transistor M4, transistor M5 and transistor M6 to form a 1:1 current mirror. Transistor M3 receives the first control current Ic, and the first control current is mirrored to the voltage-controlled resistor Rv through the current mirror. The second control power supply is connected to the voltage-controlled resistor Rv, and the second control voltage Vcon2 output by the second control power supply is used to control the resistance value of the voltage-controlled resistor Rv.

[0158] In the embodiments of the present disclosure, the current-controlled voltage Vc = Vlimit - Rv * Ic, so that the upper limit of the output voltage of Vc is limited by the voltage Vlimit output by the voltage source. The relationship between the second control voltage Vcon2 and the voltage-controlled resistor Rv is in a direct proportion. When Vcon2 is larger, the resistance value of the voltage-controlled resistor Rv connected to the circuit is larger, and its simplified equivalent circuit is as Figure 8 shown.

[0159] In the embodiment of the present disclosure, Figure 10 As shown in the formula Vc=Vlimit-Rv*Ic, Vcon2 is directly proportional to the voltage-controlled resistor Rv, so Vcon2 can control the proportional relationship between Vc and Ic, thereby controlling the amplitude of the variable resistor 101 changing with the input power.

[0160] In the embodiment of the present disclosure, the equivalent resistance value Requ of the variable resistor 101 can be in inverse proportion to the current control voltage Vc, such as linear, square, or exponential. Taking the linear relationship as an example, the equivalent resistance Requ changes with the change of the resistance control voltage Vc1, such as Figure 11 shown.

[0161] In the embodiment of the present disclosure, after the variable resistor 101, i.e., D1, controlled by the compensation circuit component 100 is connected to the feedback circuit of the power amplifier 200, the total feedback resistance can be expressed as Rtotal = R2 + Requ, where R2 is a fixed resistance with a unit order of about 100 ohms. This is to avoid the situation where the equivalent resistance of D1 is too small under low power input conditions, resulting in too deep feedback and too low low power signal gain. The curve of Rtotal resistance changing with the resistance control voltage Vc1 is as follows: Figure 12 shown.

[0162] In the embodiments of the present disclosure, combined with the above embodiments and Figure 9 、 Figure 10 、 Figure 11 as well as Figure 12 As shown, Figure 9 It shows that the first control current Ic output by the first sub-control component 1031 is in direct proportion to the power of the input signal. Figure 10 It shows that the control signal of the second sub-control component 1032, such as the current control voltage Vc, is in inverse proportion to the first control current Ic. Figure 11 It shows that after the current control voltage Vc is divided by the isolation resistor 104, the output resistance control voltage Vc1 is output. The equivalent resistance Requ of the variable resistor 101 decreases as the voltage Vc1 increases. Figure 12 It shows that the feedback resistance Rtotal = R2 + Requ decreases as the voltage Vc1 increases, from the maximum value Rmax of Requ to zero. In this way, the relationship between the feedback resistance Rtotal and the input power Pin can be made as follows: Figure 13 As shown, the improvement effect of the AM-AM curve of the first control voltage Vcon1 and the second control voltage Vcon2 is as follows: Figure 14 、 Figure 15As shown, Vcon1 is used to determine the starting power point Poffset for the compensation gain, and Vcon2 is used to control the magnitude of the feedback depth decreases with input power. Vcon1 and Vcon2 are controlled by a wired or wireless external device with executable logic control, such as a single-chip microcomputer or a smart terminal with controller and communication capabilities. The smart terminal or logic control device can be programmed to make targeted adjustments based on the AMAM curve at different frequencies, ensuring that the power amplifier meets good ACLR requirements across a wide operating frequency band. This allows gain compensation to be achieved across the gain curve at different frequencies. During pre-gain reduction, the gain is increased by increasing the feedback resistance, ensuring that the increased gain remains within the flat portion of the gain curve, thereby ensuring the linearity of the power amplifier and mitigating linear distortion.

[0163] In combination with the above embodiments, the following examples are provided:

[0164] Example 1: A compensation circuit component.

[0165] In mobile communication systems, the efficiency and linear power of the front-end power amplifier (PA) directly impact the energy consumption and communication quality of base stations and mobile terminals. The output power and adjacent band leakage ratio (ACLR) of the terminal device's uplink modulated signal after amplification by the PA must meet the requirements of various mobile communication protocols. In memory-free systems, the PA's ACLR performance can be characterized by its amplitude modulation-to-amplitude modulation distortion (AM-AM) and amplitude modulation-to-phase modulation distortion (AM-PM). The greater the rate of change of AM-AM and AM-PM with input signal variations, the worse the ACLR of the amplifier's output signal. AM-AM distortion primarily stems from the nonlinearity of the PA's transistor voltage input-to-output characteristics (e.g., square-rate dependence for MOS transistors and exponential dependence for HBT transistors) when input signals are applied. As the input drive power increases, the PA experiences gain compression, leading to spectral spread and deteriorating ACLR.

[0166] When designing an amplifier, the difference between the linear power (distortion-free or weakly distorted power) and the saturation power of the power amplifier is typically determined based on the PAR (the ratio of peak power with a probability of 0.01% to the total average power) of the non-constant envelope modulation signal used in the communication system. Choosing this difference requires a compromise between the power amplifier's ACLR performance and efficiency. If the value is too large, the amplifier's load impedance must generally be reduced, and the output signal ACLR will fall far short of meeting protocol requirements. However, the amplifier's operating current will be high, resulting in low efficiency. If the value is too small, the amplifier's load impedance can be increased, reducing the amplifier's current consumption. However, premature gain compression will cause distortion of signals above the average power, and ACLR performance will fail to meet protocol requirements.

[0167] There are many ways to minimize the impact of power amplifier gain compression on the output signal ACLR while maintaining efficiency. Digital compensation methods such as envelope tracking and digital pre-distortion are effective but require external chips, resulting in high cost and complex control. Alternatively, an AM-AM compensation circuit can be added to the amplifier chain. As the input signal amplitude increases, the amplifier bias current (voltage) is increased to compensate for the AM-AM compression. This circuit is relatively simple, effective, easy to integrate, and very low in cost.

[0168] Common power amplifier circuits such as Figure 1 As shown in the figure, the mirror bias circuit composed of NMOS tube M1, filter capacitor C1, isolation resistor Rb and current source Ib provides DC bias current to the power tube; the function of isolation capacitors Cb1 and Cb2 is to feed in and out the RF signal and isolate the DC; the feedback network composed of isolation capacitors Cf1, Cf2 and feedback resistor R2 controls the gain and stability of the power tube M2. The smaller the value of feedback resistor R2, the deeper the negative feedback and the lower the amplifier gain. The curve of the amplifier AM-AM changing with the feedback resistor R2 is shown in the figure. Figure 2 As shown in the figure, P1dB is the 1dB gain compression point, and Psat is the amplifier's saturation power. The amplifier's linear power is largely limited by the nonlinear distortion of the amplifier tube components. As the amplifier's output power (Pout) increases, the AM-AM ratio begins to decline, and ACLR deteriorates. In the context of multi-band, multi-mode mobile terminal applications, achieving full coverage of the amplifier's operating bandwidth through external matching is difficult. Repeated iteration and compromise optimization across different frequency bands are required, resulting in low development efficiency.

[0169] This example proposes an AM-AM compensation circuit based on a variable resistor, a detector, and a programmable current-controlled voltage source. The power point at which the AM-AM compensation is turned on and the rate of change of the AM-AM with the input signal are programmable. This allows for free adjustment based on the actual circuit state, shortening the development cycle. Furthermore, different frequency points can be optimized separately, allowing the power amplifier to achieve good ACLR across the entire frequency band. Figure 3 As shown, the compensation circuit consists of three parts:

[0170] 1. Provide a detector that provides output current Ic that follows input power after the input power exceeds a specific value (Poffset). The output current Ic can be proportional to the input power Pin in a linear, piecewise linear, square, or exponential manner. Taking the linear relationship as an example, the Poffset value is controlled by the detector voltage Vcon1, which determines the power point at which AM-AM compensation is turned on. The larger the voltage Vcon1, the lower the detector power threshold. Figure 9 As shown;

[0171] 2. A programmable current-controlled voltage source that makes the output voltage Vc and the input signal Ic a decreasing function. Vc and Ic can be in a linear, piecewise linear, square, exponential or other inverse proportional relationship. Taking the linear relationship as an example, the proportional coefficient is adjustable by the voltage Vcon2. The upper limit of the output voltage of Vc is limited by Vlimit, so that Vc can be adjusted with the input signal Ic. Figure 11 The control method shown. Figure 7 A way to implement this circuit is given: M3 and M4, M5 and M6 form a 1:1 current mirror, and the voltage Vcon2 controls the voltage-controlled variable resistor Rv. The larger the value of Vcon2, the larger the resistance of the voltage-controlled variable resistor. The simplified equivalent circuit is as follows Figure 8 As shown, at this time, the output voltage Vc = Vlimit-Rv*Ic, and different Rv under different Vcon2 realizes a variable proportional relationship between Vc and Ic;

[0172] 3. Used as a voltage-controlled variable resistor D1, its control voltage Vc1 is provided by the programmable current-controlled voltage source Vc through the isolation resistor R1; the equivalent resistance value Requ of D1 can be linear, piecewise linear, square, exponential and other inverse proportional relationships with the control voltage Vc1. Taking the linear relationship as an example, the equivalent resistance Requ can be programmably controlled with the control voltage Vc1, such as Figure 12 shown.

[0173] Example 2:

[0174] In combination with Example 1 and the above embodiments, a compensation method is provided;

[0175] exist Figure 6 After the voltage-controlled variable resistor D1 is connected in series to the power amplifier feedback network, the total feedback resistance can be expressed as Rtotal = R2 + Requ, where R2 is a fixed resistor with an order of magnitude of about 100 ohms. This prevents D1's equivalent resistance Requ from being too small under low power input conditions, resulting in too deep feedback and too low small signal gain. The curve of Rtotal resistance changing with the control voltage Vc1 is shown below: Figure 13 As shown. As the input signal amplitude exceeds the detection threshold set by Vcon1, the detector begins to output a current Ic proportional to Pin. This current enters the programmable current-controlled voltage source set by Vcon2 and is converted into a control voltage. The feedback resistor Rtotal becomes a non-zero value as Requ, the feedback depth decreases, and the amplifier gain is high. As the input signal exceeds the threshold power, the value of Rtotal becomes larger, the feedback depth becomes shallower, and the amplifier gain becomes higher. The feedback depth becomes shallower as the input power input increases, compensating for the AMAM dropout caused by the nonlinear distortion of the power amplifier transistor under high power, thereby improving ACLR. The relationship between Rtotal and input power Pin is shown as follows: Figure 13 As shown, the effect of adjusting the AMAM curve of the control voltages Vcon1 and Vcon2 is as follows: Figure 14 、 15 As shown in the figure, Vcon1 can control the input power point where the feedback takes effect, and Vcon2 can control the amplitude of the feedback depth decreasing with the input power. The programming is flexible and can be adjusted according to the AMAM curve of different frequency points. In a wide operating frequency band, the amplifier can meet good ACLR requirements.

[0176] The supplementary circuit and compensation method provided by the examples or embodiments of the present disclosure achieve a relatively simple circuit with flexible design. By adjusting the compensation circuit parameters, the power point at which the AM-AM compensation is turned on and the AM-AM compensation amplitude can be programmed and adjusted. This method has a high degree of freedom, good applicability, can broaden the operating bandwidth of the amplifier, is easy to integrate, and has low cost.

[0177] In an embodiment of the present disclosure, a device is provided, comprising:

[0178] processor;

[0179] a memory for storing processor-executable instructions;

[0180] The processor is used to implement the steps of the compensation method described above when running the computer service.

[0181] Those skilled in the art will appreciate that all or part of the steps of the above-mentioned method embodiments may be implemented by hardware associated with program instructions, and the aforementioned program may be stored in a computer-readable storage medium. When the program is executed, the program executes the steps of the above-mentioned method embodiments. The aforementioned storage medium includes various media that can store program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0182] In an embodiment of the present disclosure, a medium is provided, wherein the medium contains computer-executable instructions, and the computer-executable instructions are executed by a processor to implement the steps in the compensation method described above.

[0183] Alternatively, if the above-mentioned integrated unit of the embodiment of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks or optical disks.

[0184] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the application documents.

Claims

1. A compensation circuit module, characterized in that: The compensation circuit module at least includes: a variable resistor, a detection component and a control component; The detection component has a detection terminal connected to the DC blocking capacitor of the power amplifier and used to detect the voltage swing of the input signal of the DC blocking capacitor; The control component is connected to the detection component and is used to output a control signal according to the input signal detected by the detection component; The variable resistor is connected to the output end of the control component and is used to change the resistance connected to the power amplifier according to the control signal. The resistance of the variable resistor connected to the power amplifier is used to constitute the feedback resistance of the power amplifier; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to maintain the gain in the flat section of the gain change curve; The control component includes at least a first sub-control component, and the detector includes the detection component and the first sub-control component; The detection component of the detector is used to detect the voltage swing of the input signal passing through the DC blocking capacitor; the detector is connected to the first control power supply to form the first sub-control component, and the first control power supply is used to generate a first control voltage; the detector is also used to determine a power threshold based on the first control voltage; based on the power threshold, determine a voltage swing that meets a preset condition; and output a first control current based on the voltage swing that meets the preset condition.

2. The compensation circuit module according to claim 1, wherein: The compensation circuit module also includes: an isolation resistor, which is connected to the output end of the control component and the input end of the variable resistor, and is used to change the resistance of the variable resistor connected to the power amplifier according to the control signal and the resistance value of the isolation resistor.

3. The compensation circuit module according to claim 1, wherein: The control component further includes: a second sub-control component; The first sub-control component is connected to the detection component and is configured to output the first control current proportional to the input signal according to the input signal of the DC blocking capacitor; The second sub-control component is connected to the rear end of the first sub-control component, and is configured to output a current control voltage inversely proportional to the first control current according to the first control current.

4. The compensation circuit module according to claim 3, wherein: The second sub-control component comprises at least: a voltage source, a voltage-controlled resistor, a second control power supply and a current mirror; The current mirror is connected to the voltage-controlled resistor, and is configured to receive the first control current and mirror the first control current to the voltage-controlled resistor; The voltage-controlled resistor is connected to a second control power supply, and the second control power supply outputs a second control voltage; wherein the second control voltage is used to control the resistance value of the voltage-controlled resistor; The output end of the current-controlled voltage is arranged between the voltage-controlled resistor and the current mirror, and is used to output the current-controlled voltage; wherein the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

5. A power amplifier component, characterized in that: include: A power amplifier and a compensation circuit module according to any one of claims 1 to 4, wherein the power amplifier comprises at least: a DC blocking capacitor arranged at a signal input terminal, a transistor, a bias circuit, a feedback circuit, and a DC blocking capacitor arranged at a signal output terminal; The first end of the feedback circuit is connected to the DC blocking capacitor at the signal input end, the bias circuit, and the gate of the transistor; the second end of the feedback circuit is connected to the DC blocking capacitor at the signal output end, and the drain of the transistor; the feedback resistor of the feedback circuit includes at least a fixed resistor and the variable resistor connected to the feedback circuit, and the fixed resistor and the variable resistor are used to constitute the feedback resistance of the power amplifier; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; the increased feedback resistance is used to keep the gain in the flat section of the gain change curve.

6. A compensation method, characterized in that: The method of compensating the gain of the power amplifier according to claim 5 by using the compensation circuit module according to any one of claims 1 to 4 comprises: detecting an input signal of the DC blocking capacitor by the detection component; The control component outputs a control signal based on an input signal from the DC blocking capacitor; wherein the control signal is used to change a resistance connected to the power amplifier, and a feedback resistance formed by the resistance of the variable resistor connected to the power amplifier and the fixed resistor; wherein the feedback resistance is used to increase when the gain of the power amplifier decreases; and the increased feedback resistance is used to maintain the gain in a flat section of a gain change curve; The detection component of the detector detects the voltage swing of the input signal passing through the DC blocking capacitor; the detector determines a power threshold based on the first control voltage; based on the power threshold, determines a voltage swing that meets a preset condition; and outputs a first control current based on the voltage swing that meets the preset condition.

7. The compensation method according to claim 6, characterized in that: The method further comprises: utilizing the compensation circuit module of claim 4 to compensate the gain of the power amplifier of claim 5; The first sub-control component outputs the first control current proportional to the input signal according to the input signal of the DC blocking capacitor; The second sub-control component outputs a current control voltage inversely proportional to the first control current according to the first control current.

8. The compensation method according to claim 6, characterized in that: The method further comprises: The first control current is determined based on the voltage swing of the input signal of the DC blocking capacitor; the power of the input signal is determined based on the voltage swing of the input signal, and if the power of the input signal meets the preset condition of being greater than the power threshold, the first control current is output; wherein, the first control current is proportional to the power of the input signal.

9. The compensation method according to claim 6, characterized in that: The method further comprises: utilizing the compensation circuit module of claim 4 to compensate the gain of the power amplifier of claim 5; The current mirror receives the first control current and mirrors the first control current to the voltage-controlled resistor; The second control power supply outputs a second control voltage; wherein the second control voltage is used to control the resistance value of the voltage-controlled resistor; The output end of the current-controlled voltage is set between the voltage-controlled resistor and the current mirror to output the current-controlled voltage; wherein the voltage value of the current-controlled voltage is equal to the voltage value of the voltage source minus the product of the voltage-controlled resistor and the first control current.

10. A device, characterized in that The device comprises: Memory; A processor, connected to the memory, and configured to implement the method according to any one of claims 6 to 9 through computer-executable instructions stored in the memory.

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