引入奈奎斯特(Nyquist)准则对反馈放大电路稳定性的分析

目前高等院校在模拟电子技术课程中对于负反馈放大电路稳定性进行分析时,一般采用波特图的分析方法。这种方法是将电路的幅频特性和相频特性曲线结合起来对环路增益进行分析,以此作为判断系统是否稳定的依据。由于激励信号是复数形式的变化量,因此我们还可以采用奈奎斯特准则,利用奈奎斯特图在复平面上的变化特点,对环路增益进行分析。

Analysis of the Stability of Feedback of Amplifier Circuit Based on Nyquist Rule

The stability of feedbac k of amplifier circuit is often analyzed with bode in Simulation Electron and Technology in the advanced institutes. The method is to judge whether a system is stable by analyzing the amplification of loop circuit based on amplitude frequency response and phase frequency or not. This paper suggests that there is another better way to judge whether a system is stable or not--that is analyzing the amplification of loop circuit with the Nyquist rule.