AUTOMATIC GAIN CONTROL CIRCUIT

摘要

An automatic gain control circuit has two rectifiers and a variable impedance element to which the output of the rectifiers is applied so as to obtain the gain control operation. One of the two rectifiers has a fast attack time, and controls the variable impedance element when the input signal increases suddenly, and the other one controls the variable impedance element for the time other than the time when a sudden change of the input signal is occurring, so that there is no overshoot in the output signal even through the input signal increases suddenly.