This paper introduces the structure, hardware circuit and software design of PWM DC power amplifier controlled by microcomputer.

本文介绍了单片机控制的PW M直流功率放大器的结构形式、硬件电路以及软件设计。

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The simulation results show that the amplifier of improved control circuit not only solve the question of output DC offset, but also keep the voltage gain lowered by voltage compensation technique.

仿真结果表明，改进控制电路后的系统不但解决了输出直流偏置问题，而且解决了电压补偿方法所造成的放大器增益下降问题。

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The PGA consists of the differential amplifier with variable source degeneration resistor and the DC-offset correction circuit.

该可编程增益放大器采用源极反馈电阻可变的差分放大器结构，且带有直流漂移校正电路。

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