Patent ID: 7982541

Claim:
An AGC circuit comprising: a variable gain amplifier with a gain controlled in accordance with a gain control signal; a count control signal generating section for generating a first count control signal on the basis of an output signal of the variable gain amplifier; a first up/down counter for performing an up-count operation for a first up-count clock signal or a down-count operation for a first down-count clock signal on the basis of the first count control signal; a gain control signal generating section for generating the gain control signal on the basis of a count value of the first up/down counter; and a state detector section for detecting a state of a circuit operation and outputting a state detection signal indicating whether the state of the circuit operation is a steady state or another state, when the state detection signal indicates that the state of the circuit operation is the steady state, an operation of at least one of the first up/down counter and the gain control signal generating section being controlled in such a manner as to fix the gain control signal.