一、半导体反馈放大器的基本概念与电子管放大器相似,为了改善放大器频率特性、失真、及稳定性等往往在半导体放大器中采用负反馈线路。为了说明什么是负反馈,得先说明什么是反馈。在放大电路中将被放大了的输出的一部分再回授到输入端叫做反馈。如果反馈量与输入信号方向相向即称为负反馈。在电子管电路中放大器输入端引入的反馈电压(或电流),可以和输出电压成正比,也可以和输出电流成正比。但由于半导体是一 First, the basic concept of semiconductor feedback amplifier and tube amplifier is similar, in order to improve the amplifier frequency characteristics, distortion, and stability are often used in semiconductor amplifiers with negative feedback line. To illustrate what negative feedback means, first explain what is feedback. In the amplifier circuit will be amplified part of the output feedback to the input called feedback. If the amount of feedback and input signal direction is called negative feedback. The feedback voltage (or current) introduced at the input of the amplifier in the tube circuit can be proportional to the output voltage and also to the output current. But because the semiconductor is one