Novel frequency signal power amplification circuit

Abstract

The utility model discloses a novel frequency signal power amplification circuit which comprises a signal input module, an operational amplification circuit, a power amplification circuit and a signal output module which are connected in sequence, and the operational amplification circuit comprises an operational amplifier U1A, an operational amplifier U1B and peripheral circuits thereof. The power amplification circuit comprises triodes Q1 to Q6 and peripheral circuits of the triodes Q1 to Q6; the model of the operational amplifier U1A and the model of the operational amplifier U1B are both SGMOP17C-2 amplifiers. According to the novel frequency signal power amplification circuit provided by the utility model, the output signal has the characteristics of high voltage, low temperature excursion, strong loading capacity and uneasy waveform distortion.

Description

Technical Field

[0001] The utility model relates to the technical field of power amplifiers, in particular to a novel frequency signal power amplifier circuit. Background Art

[0002] The signal power amplifier circuit is an electronic circuit that is mainly used to increase the power of the signal to drive the load, amplify the input voltage and current, and increase the power to make it more capable of carrying a load.

[0003] There are various amplifiers in the industry, which are divided into preamplifiers and power amplifiers according to their functions. The preamplifier is generally a first-stage amplifier between the signal source and the power amplifier. Its main function is to preliminarily amplify the weak input signal to increase its amplitude while reducing noise and distortion. It usually has a higher input impedance and a lower output impedance to facilitate matching with the signal source and the power amplifier, but the preamplifier does not have a signal source selection. The power amplifier is located at the end of the signal transmission link and is used to further amplify the signal output by the preamplifier to a sufficient power level to drive the load (such as speakers, motors, etc.). Existing power amplifiers, such as the domestic integrated circuit FH0189, have weak load capacity, high cost, and the integrated device is easy to heat up, and the frequency signal amplification effect is not ideal. Utility Model Content

[0004] In view of the above-mentioned deficiencies of current power amplifiers, the utility model provides a novel frequency signal power amplifier circuit, the output signal of which has the characteristics of high voltage, low temperature drift, strong load capacity and less waveform distortion.

[0005] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0006] A novel frequency signal power amplifier circuit comprises a signal input module, an operational amplifier circuit, a power amplifier circuit and a signal output module, wherein the operational amplifier circuit comprises an operational amplifier U1A, an operational amplifier U1B and peripheral circuits thereof, and the power amplifier circuit comprises transistors Q1, Q2, Q3, Q4, Q5, Q6 and peripheral circuits thereof; a voltage input signal is output to the input end of the operational amplifier after passing through the signal input module, the output end of the operational amplifier circuit is connected to the input end of the power amplifier circuit, the output end of the power amplifier circuit is connected to the signal output module, and the signal output module outputs an amplified signal; the operational amplifier circuit also comprises a feedback circuit; the operational amplifier U1A and the operational amplifier U1B are both SGMOP17C-2 amplifiers.

[0007] According to one aspect of the utility model, the peripheral circuit of the operational amplifier circuit includes capacitor C3, capacitor C5, diode D1, diode D4, diode D5, diode D6, resistor R5, resistor R7, resistor R9, resistor R14, and resistor R19; the positive power input terminal of the operational amplifier U1A is connected to capacitor C3, resistor R7, and the positive power input terminal of the operational amplifier U1B, the other end of the resistor R7 is connected to the cathode of diode D5 and the anode of diode D1, the cathode of diode D1 is connected to resistor R5 and then connected to the positive power supply; the negative power input terminal of the operational amplifier U1A is connected to capacitor C5, resistor R14, and the negative power input terminal of the operational amplifier U1B, the other end of the resistor R14 is connected to the cathode of diode D6 and the anode of diode D4, the anode of diode D6 is connected to resistor R19 and then connected to the negative power supply.

[0008] According to one aspect of the utility model, the feedback circuit includes a capacitor C2, a capacitor C12, and a resistor R11. The negative input terminal of the operational amplifier U1A is connected to the capacitor C12 and the capacitor C2. The other end of the capacitor C12 is connected to the resistor R11 and then grounded. The other end of the capacitor C2 is connected to the output terminal of the operational amplifier U1A to form a feedback loop.

[0009] According to one aspect of the present invention, the output terminal of the operational amplifier U1B is connected to the non-inverting input terminal thereof to form a voltage follower circuit.

[0010] According to one aspect of the utility model, the peripheral circuit of the power amplifier circuit includes a capacitor C1, a capacitor C9, a resistor R2, a resistor R3, a resistor R4, a resistor R8, a resistor R10, a resistor R15, a resistor R17 and a resistor R20; the output end of the operational amplifier circuit is connected to the base of the transistor Q3 and the base of the transistor Q4; the collector of the transistor Q3 is connected to the collector of the transistor Q1, the base of the transistor Q2 and the resistor R4, the other end of the resistor R4 is connected to the emitter of the transistor Q2, the base of the transistor Q1 is connected to the resistor R3 and then to the emitter of the transistor Q2, the emitter of the transistor Q1 is connected to the capacitor C1, the resistor R2 and the positive electrode of the power supply, and the other end of the resistor R2 is connected to the emitter of the transistor Q2.

[0011] According to one aspect of the utility model, the emitter of the transistor Q3 is connected to the emitter of the transistor Q4 and the resistors R10 and R8, the collector of the transistor Q4 is connected to the base of the transistor Q5, the collector of the transistor Q6 and the resistor R15, the other end of the resistor R15 is connected to the emitter of the transistor Q5, the emitter of the transistor Q6 is connected to the capacitor C9, the resistor R20 and the negative electrode of the power supply, the base of the transistor Q6 is connected to the resistor R17 and then to the emitter of the transistor Q5, and the collector of the transistor Q5 is connected to the collector of the transistor Q2 and the other end of the resistor R8.

[0012] According to one aspect of the utility model, the output end of the power amplifier circuit is further connected to a resistor R1 and then connected to the inverting input end of an operational amplifier U1A to form a feedback loop.

[0013] According to one aspect of the utility model, the signal input module includes capacitor C6, capacitor C7, capacitor C8, resistor R18, resistor R21, resistor R22 and potentiometer RP1. The capacitor C6, capacitor C7 and resistor R18 are connected in series in sequence and then connected to the potentiometer RP1. The capacitor C8 and resistor R22 are connected in parallel and then connected to the sliding end of the potentiometer RP1 with the resistor R21. The resistor R22 is also connected to the non-inverting input end of the operational amplifier U1A.

[0014] According to one aspect of the utility model, the signal output module includes a diode D2, a diode D3, a capacitor C4, a resistor R1, a resistor R13 and a resistor R12. The output end of the power amplifier circuit is connected to the anode of the diode D2, the cathode of the diode D3, the capacitor C4 and the resistor R12. The capacitor C4 is connected in series with the resistor R13 and then connected in parallel with the resistor R12. The other end of the resistor R12 is grounded.

[0015] Advantages of the implementation of the utility model: The application discloses a novel frequency signal power amplifier circuit, including a signal input module, an operational amplifier circuit, a power amplifier circuit and a signal output module connected in sequence, the operational amplifier circuit includes an operational amplifier U1A, an operational amplifier U1B and its peripheral circuits, the power amplifier circuit includes transistors Q1 to Q6 and their peripheral circuits; the operational amplifier U1A and the operational amplifier U1B are both SGMOP17C-2 amplifiers. The utility model uses an operational amplifier circuit to perform digital operational amplification on the input signal, so that the signal has the characteristics of low noise and low power consumption. Due to the characteristics of low noise and low temperature drift, the signal amplified by the digital operational amplifier has higher accuracy and stability. The signal after the operational amplifier output of the circuit of the application can have the characteristics of high voltage, low temperature drift, strong load capacity and not easy waveform distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a module schematic diagram of the novel frequency signal power amplifier circuit described in the utility model;

[0018] Figure 2 The utility model is a circuit diagram of a novel frequency signal power amplifier circuit. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0021] The specific values ​​or models of the components such as resistors, capacitors, diodes, and transistors used in this embodiment can be found in the attached Figure 2 Circuit marking information shown in .

[0022] like Figure 1 , Figure 2 As shown, the utility model provides a novel frequency signal power amplifier circuit, including a signal input module, an operational amplifier circuit, a power amplifier circuit and a signal output module. The operational amplifier circuit includes an operational amplifier U1A, an operational amplifier U1B and its peripheral circuits, and the power amplifier circuit includes transistors Q1, Q2, Q3, Q4, Q5, Q6 and their peripheral circuits; the voltage input signal is output to the input end of the operational amplifier after passing through the signal input module, the output end of the operational amplifier circuit is connected to the input end of the power amplifier circuit, the output end of the power amplifier circuit is connected to the signal output module, and the signal output module outputs the amplified signal.

[0023] The operational amplifier U1A and the operational amplifier U1B are both SGMOP17C-2 amplifiers. The SGMOP17C-2 is a dual, low-noise and high-precision operational amplifier that is optimized for high-voltage operation from a single power supply of 4.5V to 36V. This type of amplifier can provide a low bias voltage and low bias current of less than 120μV, and has a wider range of applications.

[0024] In practical applications, the peripheral circuit of the operational amplifier circuit includes capacitor C3, capacitor C5, diode D1, diode D4, diode D5, diode D6, resistor R5, resistor R7, resistor R9, resistor R14, and resistor R19.

[0025] The positive power input terminal of the operational amplifier U1A is connected to the capacitor C3, the resistor R7 and the positive power input terminal of the operational amplifier U1B;

[0026] The other end of the resistor R7 is connected to the cathode of the diode D5 and the anode of the diode D1;

[0027] The cathode of diode D1 is connected to resistor R5 and then to the positive pole of power supply;

[0028] The anode of diode D5 is grounded;

[0029] The negative power input terminal of the operational amplifier U1A is connected to the capacitor C5, the resistor R14 and the negative power input terminal of the operational amplifier U1B;

[0030] The other end of the resistor R14 is connected to the cathode of the diode D6 and the anode of the diode D4;

[0031] The anode of diode D6 is connected to resistor R19 and then to the negative pole of power supply;

[0032] The cathode of diode D4 is grounded;

[0033] The output end of the operational amplifier U1A is connected to the resistor R9 and the capacitor C2, and the other end of the resistor R9 serves as the output end of the operational amplifier circuit.

[0034] In this embodiment, unless otherwise specified, the voltage of the positive electrode of the power supply defaults to +38V, and the voltage of the negative electrode of the power supply defaults to -38V.

[0035] The operational amplifier circuit further includes a feedback circuit, which includes a capacitor C2, a capacitor C12, and a resistor R11.

[0036] Wherein, the negative phase input terminal of the operational amplifier U1A is connected to the capacitor C12 and the capacitor C2;

[0037] The other end of capacitor C12 is connected to resistor R11 and then grounded;

[0038] The other end of capacitor C2 is connected to the output end of operational amplifier U1A to form a feedback loop;

[0039] The non-inverting input terminal of the operational amplifier U1A is connected to the output terminal of the signal input module.

[0040] The feedback circuit is used to feedback whether the circuit is working properly.

[0041] In this embodiment, the output end of the operational amplifier U1B is connected to its non-phase input end to form a voltage follower circuit. The voltage follower uses negative feedback to achieve matching between the output voltage and the input voltage, which can improve the circuit's load capacity and enable the output signal to better drive the next stage circuit.

[0042] The peripheral circuit of the power amplifier circuit includes a capacitor C1, a capacitor C9, a resistor R2, a resistor R3, a resistor R4, a resistor R8, a resistor R10, a resistor R15, a resistor R17 and a resistor R20.

[0043] The output end of the operational amplifier circuit is connected to the base of the transistor Q3 and the base of the transistor Q4. The principle is that the change of the output signal of the operational amplifier circuit causes the base current of the above transistors to change. After the change of the base current is amplified, it causes the collector current to change.

[0044] The collector of transistor Q3 is connected to the collector of transistor Q1, the base of transistor Q2 and resistor R4;

[0045] The other end of the resistor R4 is connected to the emitter of the transistor Q2;

[0046] The base of transistor Q1 is connected to resistor R3 and then to the emitter of transistor Q2;

[0047] The emitter of transistor Q1 is connected to capacitor C1, resistor R2 and the positive electrode of the power supply, and the other end of capacitor C1 is grounded;

[0048] The other end of the resistor R2 is connected to the emitter of the transistor Q2.

[0049] The emitter of transistor Q3 is connected to the emitter of transistor Q4 and resistor R10 and resistor R8, and the other end of resistor R10 is grounded;

[0050] The collector of transistor Q4 is connected to the base of transistor Q5, the collector of transistor Q6 and resistor R15;

[0051] The other end of the resistor R15 is connected to the emitter of the transistor Q5;

[0052] The emitter of transistor Q6 is connected to capacitor C9, resistor R20 and the negative electrode of the power supply, and the other end of capacitor C9 is grounded;

[0053] The base of transistor Q6 is connected to resistor R17 and then connected to the emitter of transistor Q5;

[0054] The collector of the transistor Q5 is connected to the collector of the transistor Q2 and the other end of the resistor R8.

[0055] The other end of the resistor R8 serves as the output end of the power amplifier circuit.

[0056] The output end of the power amplifier circuit is also connected to a resistor R1 and then connected to the inverting input end of the operational amplifier U1A to form a feedback loop.

[0057] The main function of the power amplifier circuit is to amplify the positive half cycle of the sinusoidal signal through the main components such as transistor Q1, transistor Q2, and transistor Q3, and to amplify the negative half cycle of the sinusoidal signal through the main components such as transistor Q4, transistor Q5, and transistor Q6.

[0058] In practical applications, the signal input module includes a capacitor C6, a capacitor C7, a capacitor C8, a resistor R18, a resistor R21, a resistor R22 and a potentiometer RP1.

[0059] Among them, capacitor C6, capacitor C7, and resistor R18 are connected in series in sequence and connected to port 1 of potentiometer RP1 and the signal input port (P1), and port 3 of potentiometer RP1 is grounded;

[0060] Capacitor C8 and resistor R22 are connected in parallel and then connected to the sliding end (2-port) of potentiometer RP1 with resistor R21;

[0061] The resistor R22 is also connected to the non-inverting input terminal of the operational amplifier U1A, serving as the output terminal of the signal input module;

[0062] The other end of the resistor R22 is grounded.

[0063] The main function of the signal input module is to form an RC filter circuit through resistor R21, resistor R22 and capacitor C8, and to form input filtering and input signal voltage adjustment through capacitor C6, capacitor C7, resistor R18 and potentiometer RP1. In this embodiment, capacitor C6 and capacitor C7 are both electrolytic capacitors.

[0064] In practical applications, the signal output module includes a diode D2, a diode D3, a capacitor C4, a resistor R1, a resistor R13 and a resistor R12.

[0065] The output end of the power amplifier circuit is connected to the anode of the diode D2, the cathode of the diode D3, the capacitor C4 and the resistor R12;

[0066] The cathode of diode D2 is connected to the positive pole of the power supply, and the anode of diode D3 is connected to the negative pole of the power supply;

[0067] The capacitor C4 is connected in series with the resistor R13 and in parallel with the resistor R12, and one end of the capacitor C4 is connected to the resistor R8 and the signal output port (P2), and the other end is grounded.

[0068] The main function of the signal output module is to filter and stabilize the output signal through diode D2, diode D3, capacitor C4, resistor R12 and resistor R13.

[0069] The utility model adopts an operational amplifier circuit to perform digital operational amplification on the input signal, so that the signal has the characteristics of low noise and low power consumption. Due to the characteristics of low noise and low temperature drift, the signal amplified by the digital operational amplifier has higher accuracy and stability. The signal output by the operational amplifier of the circuit of the application can have the characteristics of high voltage, low temperature drift, strong load capacity and not easy waveform distortion.

[0070] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A novel frequency signal power amplifier circuit, comprising a signal input module, an operational amplifier circuit, a power amplifier circuit and a signal output module, characterized in that: The operational amplifier circuit includes an operational amplifier U1A, an operational amplifier U1B and peripheral circuits thereof; the power amplifier circuit includes transistors Q1, Q2, Q3, Q4, Q5, Q6 and peripheral circuits thereof; the voltage input signal is output to the input end of the operational amplifier after passing through the signal input module; the output end of the operational amplifier circuit is connected to the input end of the power amplifier circuit; the output end of the power amplifier circuit is connected to the signal output module, and the signal output module outputs the amplified signal; the operational amplifier circuit also includes a feedback circuit; the operational amplifier U1A and the operational amplifier U1B are both SGMOP17C-2 amplifiers.

2. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The peripheral circuit of the operational amplifier circuit includes capacitor C3, capacitor C5, diode D1, diode D4, diode D5, diode D6, resistor R5, resistor R7, resistor R9, resistor R14, and resistor R19; The positive power input terminal of the operational amplifier U1A is connected to the capacitor C3, the resistor R7 and the positive power input terminal of the operational amplifier U1B, the other end of the resistor R7 is connected to the cathode of the diode D5 and the anode of the diode D1, the cathode of the diode D1 is connected to the resistor R5 and then to the positive power supply; The negative power input terminal of the operational amplifier U1A is connected to the capacitor C5, the resistor R14 and the negative power input terminal of the operational amplifier U1B. The other end of the resistor R14 is connected to the cathode of the diode D6 and the anode of the diode D4. The anode of the diode D6 is connected to the resistor R19 and then to the negative power supply terminal.

3. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The feedback circuit includes capacitor C2, capacitor C12, and resistor R11. The negative input end of the operational amplifier U1A is connected to capacitor C12 and capacitor C2, the other end of capacitor C12 is connected to resistor R11 and then grounded, and the other end of capacitor C2 is connected to the output end of the operational amplifier U1A to form a feedback loop.

4. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The output end of the operational amplifier U1B is connected to its non-inverting input end to form a voltage follower circuit.

5. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The peripheral circuit of the power amplifier circuit includes a capacitor C1, a capacitor C9, a resistor R2, a resistor R3, a resistor R4, a resistor R8, a resistor R10, a resistor R15, a resistor R17 and a resistor R20; the output end of the operational amplifier circuit is connected to the base of the transistor Q3 and the base of the transistor Q4; The collector of the transistor Q3 is connected to the collector of the transistor Q1, the base of the transistor Q2 and the resistor R4, the other end of the resistor R4 is connected to the emitter of the transistor Q2, the base of the transistor Q1 is connected to the resistor R3 and then to the emitter of the transistor Q2, the emitter of the transistor Q1 is connected to the capacitor C1, the resistor R2 and the positive electrode of the power supply, and the other end of the resistor R2 is connected to the emitter of the transistor Q2.

6. The novel frequency signal power amplifier circuit according to claim 5 is characterized in that: The emitter of the transistor Q3 is connected to the emitter of the transistor Q4 and the resistors R10 and R8, the collector of the transistor Q4 is connected to the base of the transistor Q5, the collector of the transistor Q6 and the resistor R15, the other end of the resistor R15 is connected to the emitter of the transistor Q5, the emitter of the transistor Q6 is connected to the capacitor C9, the resistor R20 and the negative electrode of the power supply, the base of the transistor Q6 is connected to the resistor R17 and then to the emitter of the transistor Q5, and the collector of the transistor Q5 is connected to the collector of the transistor Q2 and the other end of the resistor R8.

7. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The output end of the power amplifier circuit is also connected to a resistor R1 and then connected to the inverting input end of the operational amplifier U1A to form a feedback loop.

8. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The signal input module includes capacitor C6, capacitor C7, capacitor C8, resistor R18, resistor R21, resistor R22 and potentiometer RP1. The capacitor C6, capacitor C7 and resistor R18 are connected in series in sequence and then connected to the potentiometer RP1. The capacitor C8 and resistor R22 are connected in parallel and then connected to the sliding end of the potentiometer RP1 with the resistor R21. The resistor R22 is also connected to the non-inverting input end of the operational amplifier U1A.

9. The novel frequency signal power amplifier circuit according to claim 1 is characterized in that: The signal output module includes a diode D2, a diode D3, a capacitor C4, a resistor R1, a resistor R13 and a resistor R12. The output end of the power amplifier circuit is connected to the anode of the diode D2, the cathode of the diode D3, the capacitor C4 and the resistor R12. The capacitor C4 is connected in series with the resistor R13 and then connected in parallel with the resistor R12. The other end of the resistor R12 is grounded.

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