AGC circuit

Details AGC circuit AGC circuit

2006-03-21

2006-03-21

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S278000

Reexamination Certificate

active

07015759

ABSTRACT:
An AGC circuit of the present invention includes a first up/down counter for converting the amount of change in an output voltage higher than a threshold voltage into a count value and controlling a gain of a variable gain amplifier circuit and a second up/down counter to which a reference clock having a lower frequency than that of a reference clock supplied to the first up/down counter is supplied. Count values of the first and second up/down counters are D/A-converted and then compared with each other by a voltage comparator. An up/down count of the first up/down counter is controlled based on a comparison result and the gain of the variable gain amplifier circuit is controlled using only a signal based on the count value of the first up/down counter, thereby suppressing distortion of an output waveform and the generation of a frequency signal which is not originally input.

REFERENCES:
patent: 5179353 (1993-01-01), Miyake
patent: 5566363 (1996-10-01), Senda
patent: 5752171 (1998-05-01), Akiya
patent: 6038432 (2000-03-01), Onoda
patent: 6057732 (2000-05-01), Morishita
patent: 6577852 (2003-06-01), Iwata et al.
patent: 6847261 (2005-01-01), Iwata et al.
patent: 2004/0178851 (2004-09-01), Ishida et al.
patent: 8-116226 (1996-05-01), None

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