Patent ID: 7795967
Filing Date: 2010-09-14
Classification: H03G

Abstract:
1. An AGC circuit, comprising a variable gain amplifying circuit for amplifying an inputted signal; an A/D conversion circuit for A/D converting an output signal of the variable gain amplifying circuit; a gain control unit for detecting an output amplitude of the variable gain amplifying circuit from an output signal of the A/D conversion circuit, comparing the output amplitude of the variable gain amplifying circuit with preset reference amplitude to thereby generate gain control signals, and outputting the generated gain control signals to the variable gain amplifying circuit; and an offset compensation unit for detecting an output DC offset amount of the variable gain amplifying circuit from the output signal of the A/D conversion circuit, generating an offset compensation signal for compensating an output DC offset of the variable gain amplifying circuit, and outputting the generated offset compensation signal to the variable gain amplifying circuit.