AUTOMATIC GAIN CONTROL CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an automatic gain control circuit that controls a gain in a short time.SOLUTION: The amplitude of an output signal (amplified signal) of a variable gain amplifier 11 is detected by an amplitude monitor section 12, and with an amplitude monitor signal Adetected by the amplitude monitor section 12, a predetermined amplitude monitor signal Acorresponding to the amplitude of a desired amplified signal, and a gain Gset in the variable gain amplifier 11, a gain Gfor producing the desired amplified signal is calculated by (A/A)Gand set in the variable gain amplifier 11.