用微变等效法分析差动放大电路

Analysis of Differential Amplifier with the Method of Slight Variation

传统对差动放大电路的动态分析,均多是根据输入、输出信号的特点,利用特定条件下的微变等效分析,这种方法易于得出结论,但不容易理解其物理含义,这是认识和理解差动放大电路的难点之一。文中从典型的电路出发,根据连接方式的不同,得出相应的指标,从而解决了这个难题。

Most tradional analysis of the differential amplifiers in dynamic state is conducted under specific condition and based on the characterics of signals input and output. Conclusions can easily be drawn after such analysis, yet their physics implication is hard to get across. This constitutes one of the difficulties in recognizing and understanding the differential amplifiers. This paper derives indexes concerned from typical circuit and different linking methods so as to provide an approach to this problem.