摘要
本文提出“虚接”的概念，利用此概念可以解决反馈放大电路在拆环时反馈网络Ｆ对基本放大电路Ａ的负载效应问题和单向化问题。拆环后所得到的Ａ和Ｆ的物理意义清楚，方法简单；代入通用公式后，其结果与用解析法得出的完全一致。
It is well known that the operation principle of a single loop feedback amplifier can be represented by a block diagram consisting of basic amplifier A and feedback network F. Usually,the evaluation of A and F is carried out by means of 4-terminal network theory. However,since an assumption is made in making F unidirectional,the result of the evaluation will not be accurate,and in some particular cases,the error is not negligible. In this paper,by introducing a new concept namely virtual connection,the result can be exact and identical with that obtained from analytical method. The rules of separating F form A and the expression of A thus formed are simple too.
出处
《电气电子教学学报》
2000年第2期27-31,共5页
Journal of Electrical and Electronic Education
关键词
反馈放大电路
拆环
虚接
电子电路
feedback amplifier analysis
separation of A and F form the feedback loop
virtual connection
