Automatic gain controller

Details Automatic gain controller Automatic gain controller

2006-04-14

2008-12-30

Pascal, Robert (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S254000

Reexamination Certificate

active

07471147

ABSTRACT:
An automatic gain controller includes a variable gain amplifier for amplifying an input signal having a specified DC level on the basis of the DC level, and outputting a first differential signal having a specified gain α, a second differential signal having a 180° phase difference from the first differential signal, and an output signal obtained by subtracting the second differential signal from the first differential signal; a full-wave-rectifying unit for full-wave-rectifying the first differential signal and the second differential signal; a low-pass filter for extracting the DC component from the output signal of the full-wave-rectifying unit and outputting the extracted DC component; a reference voltage level adjustment unit for adjusting a DC level of a reference voltage; and a comparison unit for comparing the output signal of the low-pass filter with the output signal of the reference voltage level adjustment unit to adjust a gain of the variable gain amplifier.

REFERENCES:
patent: 7215191 (2007-05-01), Maejima
patent: 2002/0008581 (2002-01-01), Callahan Jr.
patent: 2005/0264347 (2005-12-01), Gyohten et al.

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