电压放大倍数的频率响应是电子技术中一个重要的问题;也是一个费解的问题。本文提供了一种较为简便的分析方法——混合参数π型微变等效电路法。这种分析方法之所以能行的通,就是因为我们所讨论的输入电压非常的小,同时静态工作点(Q)又选的合适,选在特性曲线的直线部分,晶体管的电压和电流的交流分量之间的关系基本上是线性的。这样,就可用微变等效电路来替代晶体管电路进行分析了。本文分析了中频电压放大,特别是利用相位超前和落后的RC电路的概念来分析了低频电压放大和高频电压放大的幅频特性和相频特性,物理概念比较明确。最后将低, The frequency response of voltage magnification is an important issue in electronic technology; it is also a matter of conviction. This article provides a simpler method of analysis - mixed parameter π-type micro-equivalent circuit method. The reason why this analysis method works, because we are talking about the input voltage is very small, while the static operating point (Q) and the election of the right, selected in the linear part of the characteristic curve, the transistor voltage and current exchange The relationship between the components is basically linear. In this way, we can use the micro-equivalent circuit to replace the transistor circuit analysis. This paper analyzes the intermediate frequency voltage amplification, especially using the concept of phase lead and backward RC circuits to analyze the amplitude-frequency characteristics and phase-frequency characteristics of low-frequency voltage amplification and high-frequency voltage amplification. The physical concept is relatively clear. Finally, low,