对反馈放大电路类型判定方法的研究

Judging method of feedback magnifying circuit types

反馈放大电路由基本放大电路和反馈网络组成,反馈桥梁是反馈网络的一部分或全部。反馈放大电路类型的判定方法是:反馈桥梁的一端连接在输出电压的"上端"(或"下端")就形成电压(或电流)反馈,反馈桥梁的另一端连接输入信号的"前端"(或"后端")就形成并联(或串联)反馈,再利用瞬时极性法确定使净输入量减小(或增大)的反馈为负反馈(或正反馈)。此方法能快速地判定出反馈放大电路的类型。

Feedback magnifying circuit from the basic amplifying circuit and the feedback network composition,feedback bridge is part or all of the feedback network.Feedback magnifying circuit types of determination method is： feedback of the bridge connects to the output voltage of the ＂top＂（or ＂bottom＂） will form voltage（or current） feedback,feedback on the other side of the bridge connecting input signal ＂front＂（or ＂back-end＂） the formation of the parallel（or series） feedback,and then polarity make net method is used to determine the instantaneous input of the decrease（or increase） feedback for negative feedback（or positive feedback）.This method can quickly determine the types of feedback magnifying circuit.