Patent ID: 9729249
Date: 2017-08-08
CPC Classifications: H03F,H03G,H04B

Claim:
1. An amplification circuit comprising: an amplifier which has a gain based on a gain control signal and which amplifies an input signal by the gain; and a gain control signal generator which outputs the gain control signal for increasing the gain after decreasing the gain based on an amplitude of the input signal, when the amplitude of the input signal is detected, wherein the gain control signal generator comprises: an amplitude detector which detects the amplitude of the input signal; a comparator which generates the gain control signal by comparing an output value of the amplitude detector and a first reference value; and an integration circuit which generates the first reference value based on a time integration value obtained by integrating a difference between the gain control signal and a second reference value, wherein the integration circuit executes feedback control to make a time-averaged value of the gain control signal approach the second reference value.