Variable gain amplifier
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United States of America Patent
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Feb 10, 2004
Grant Date -
Mar 27, 2003
app pub date -
Aug 2, 2002
filing date -
Sep 27, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable gain amplifier device comprises a variable gain amplifier circuit which amplifies a difference between an input signal and a feedback signal to output an output signal, a feedback circuit which supplies the feedback signal to the variable gain amplifier circuit, and a controller which controls the variable gain amplifier circuit and the feedback circuit to decrease a cutoff frequency of the feedback circuit according to increase of a gain of the variable gain amplifier circuit or vice versa.
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