AGC circuit

Details AGC circuit AGC circuit

2007-10-31

2008-10-28

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S278000

Reexamination Certificate

active

07443242

ABSTRACT:
An AGC circuit includes: a variable gain amplifier circuit having a gain controlled with a gain control signal; a rectifier circuit for rectifying an output signal of the variable gain amplifier circuit; a voltage comparator for comparing a rectified signal with a threshold voltage; an up/down counter that switches between up-counting and down-counting according to the level of an output voltage of the voltage comparator; and a D/A converter circuit for outputting a voltage corresponding to a count value of the up/down counter. The gain control signal supplied to the variable gain amplifier circuit corresponds to the voltage output from the D/A converter circuit, and the threshold voltage for the voltage comparator is a voltage corresponding to the voltage output from the D/A converter circuit.

REFERENCES:
patent: 4360787 (1982-11-01), Galpin
patent: 4910797 (1990-03-01), Min et al.
patent: 5150075 (1992-09-01), Hietala et al.
patent: 5504457 (1996-04-01), Jensen
patent: 5566363 (1996-10-01), Senda
patent: 5606284 (1997-02-01), Tamesue et al.
patent: 5752171 (1998-05-01), Akiya
patent: 6038432 (2000-03-01), Onoda
patent: 6057732 (2000-05-01), Morishita
patent: 6977550 (2005-12-01), Ishida et al.
patent: 2004/0178851 (2004-09-01), Ishida et al.
patent: 2005/0030099 (2005-02-01), Ishida et al.
patent: 60-123115 (1985-07-01), None
patent: 61-133713 (1986-06-01), None
patent: 63-77205 (1988-04-01), None
patent: 63-228808 (1988-09-01), None
patent: 4-355517 (1992-12-01), None
patent: 5-63481 (1993-03-01), None
patent: 7-202600 (1995-08-01), None
patent: 8-8768 (1996-01-01), None
patent: 2000-138549 (2000-05-01), None
patent: 2000-216653 (2000-08-01), None
patent: 2003-152483 (2003-05-01), None
Japanese Office Action, with English translation, issued in Japanese Patent Application No. JP 2004-244249, mailed Feb. 19, 2008.
Japanese Office Action issued in corresponding Japanese Patent Application No. JP 2003-064980, dated Oct. 17, 2006.
Japanese Office Action issued in corresponding Japanese Patent Application No. JP 2003-287926, dated Oct. 17, 2006.

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