A complementary power amplifier

By designing a complementary power amplifier and utilizing a common-mode suppression circuit composed of a large-loop negative feedback and transistors, mid-to-high frequency interference is eliminated, solving the problems of poor stability and high-frequency conversion heat generation in existing power amplifiers, and improving signal stability and accuracy.

CN224521022UActive Publication Date: 2026-07-17TIANJIN POLYTECHNIC UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
TIANJIN POLYTECHNIC UNIV
Filing Date
2025-06-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing power amplifiers in neural modulation devices suffer from poor stability, susceptibility to distortion, and severe overheating during high-frequency switching.

Method used

A complementary power amplifier is employed, which eliminates mid-to-high frequency interference by introducing large-loop negative feedback and filtering with polarized capacitors and resistors. It utilizes NPN and PNP transistors to form a common-mode suppression circuit and a differential amplification structure, and combines the parallel and series structures of resistors and capacitors to form current series negative feedback to improve the output waveform.

Benefits of technology

It significantly improves signal stability and accuracy, reduces high-frequency interference and crossover distortion, reduces equipment overload risk, and improves response speed and output signal quality.

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    Figure CN224521022U_ABST
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Abstract

The utility model belongs to the technical field of electronic circuit, concretely relates to a complementary power amplifier, including input terminal P2, polarity capacitor U3, resistance R40, first level input stage circuit, second level common -emission amplifier circuit, third level amplifier circuit, resistance R32, electric capacity C12 and output terminal P1, input terminal P2 is connected with polarity capacitor U3, polarity capacitor U3 is connected with resistance R40 and resistance R41, resistance R40 is connected with first level input stage circuit, first level input stage circuit is connected with second level common -emission amplifier circuit, second level common -emission amplifier circuit is connected with third level amplifier circuit, third level amplifier circuit is connected with resistance R32 and output terminal P1, through the introduction big loop negative feedback, has improved power amplification effect significantly, through polarity capacitor U3 and resistance R41 filter elimination medium high frequency interference, NPN transistor Q1 and NPN transistor Q2 in the circuit constitute the common mode circuit of inhibition, effectively reduce high frequency interference signal, and output signal is more stable.
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Claims

1. A complementary power amplifier characterized by: It includes an input terminal P2, a polarized capacitor U3, a resistor R40, a first-stage input stage circuit, a second-stage common-emitter amplifier circuit, a third-stage amplifier circuit, a resistor R32, a capacitor C12, and an output terminal P1. The input terminal P2 is connected to the polarized capacitor U3, the polarized capacitor U3 is connected to resistors R40 and R41, the resistor R40 is connected to the first-stage input stage circuit, the first-stage input stage circuit is connected to the second-stage common-emitter amplifier circuit, the second-stage common-emitter amplifier circuit is connected to the third-stage amplifier circuit, and the third-stage amplifier circuit is connected to resistor R32 and the output terminal P1.

2. A complementary power amplifier as claimed in claim 1, characterized in that: The first-stage input circuit includes an NPN transistor Q1. The base of NPN transistor Q1 is connected to resistor R40. The collector of NPN transistor Q1 is connected to resistor R44, and its emitter is connected to resistor R42. Resistor R44 is connected to resistors R45 and R46. Resistor R45 is connected to the collector of NPN transistor Q2. The base of NPN transistor Q2 is connected to resistor R56. Resistor R56 is connected to a polarized capacitor U4. The polarized capacitor U4 is connected to ground. The emitter of NPN transistor Q2 is connected to resistor R42. Resistor R42 is connected to the collector of NPN transistor Q10. The base of NPN transistor Q10 is connected to diode D1 via resistor R49. Resistor R49 is connected to ground. The emitter of NPN transistor Q10 is connected to resistor R50. Diode D1 is connected to diode D3. Diode D3 is connected to resistor R50 and diode D4.

3. A complementary power amplifier as claimed in claim 2, characterized in that: The second-stage common-emitter amplifier circuit includes a PNP transistor Q18. The emitter of the PNP transistor Q18 is connected to a resistor R46. The collector of the PNP transistor Q18 is connected to a capacitor C15 and the collector of an NPN transistor Q1. The collector of the PNP transistor Q18 is connected to a capacitor C15, a resistor R54, and a resistor R55. Resistors R54 and R55 are connected in parallel. Resistors R54 and R55 are connected to the base of an NPN transistor and a resistor R52. Resistor R52 is connected to the collector of an NPN transistor Q11 and the emitter of an NPN transistor Q4. The base of an NPN transistor Q11 is connected to a resistor R51 and a diode D2. The emitter of an NPN transistor Q11 is connected to a resistor R53. Resistor R51 is connected to the ground wire. Capacitors D2 and D4 are connected. Capacitor D4, resistor R53, and the negative terminal of the power supply are connected.

4. A complementary power amplifier as claimed in claim 3, characterized in that: The second-stage common-emitter amplifier circuit also includes a resistor R43, which is connected in parallel with a capacitor C16. One end of the resistor R43 is connected to a resistor R56, and the other end is connected to a resistor R47.

5. A complementary power amplifier as claimed in claim 4, characterized in that: The third-stage amplifier circuit includes an NPN transistor Q3. The collector of the NPN transistor Q3 is connected to the positive terminal of the power supply. The base of the NPN transistor Q3 is connected to capacitor C17, the collector of NPN transistor Q4, and the collector of PNP transistor Q18. The emitter of the NPN transistor Q3 is connected to resistors R11 and R26. The capacitor C17 is connected to the base of PNP transistor Q17. The emitter of PNP transistor Q17 is connected to resistors R26 and R48. The collector of PNP transistor Q17 is connected to the negative terminal of the power supply and the collector of PNP transistor Q12. The base of PNP transistor Q12 is connected to resistor R48. Resistor R47 is connected to resistor R19. Resistor R19 is connected to the emitter of NPN transistor Q5. The base of NPN transistor Q5 is connected to resistor R11. The collector of NPN transistor Q5 is connected to the positive terminal of the power supply.

6. A complementary power amplifier as claimed in claim 5, characterized in that: The resistor R32 is connected to the capacitor C12, and the capacitor C12 is connected to the ground wire and the output terminal P1.

7. A complementary power amplifier as described in claim 6, characterized in that: The resistor R41 is connected to the ground wire and the input terminal P2.