In the early years of radio circuits, fading (defined as slow variations in the amplitude of the received signals) required continuing adjustments in the receiver’s gain in order to maintain a relative constant output signal. Such situation led to the design of circuits, which primary ideal function was to maintain a constant signal level at the output, regardless of the signal’s variations at the input of the system. Originally, those circuits were described as automatic volume control circuits, a few years later they were generalized under the name of Automatic Gain Control (AGC) circuits [1,2].

自己收集的一些自动增益控制(AGC)电路的资料!原来是准备参加待电子设计大赛初赛的,后面没选这个题目!

一、AGC到底是怎么回事？ 二、AGC为什么不会改变信号中包含的信息？