AGC circuit and radio receiver
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United States of America Patent
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Oct 9, 2018
Grant Date -
Oct 26, 2017
app pub date -
Jul 7, 2017
filing date -
Jan 14, 2015
priority date (Note) -
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Abstract
An AGC circuit for a radio receiver includes a detector converting a high frequency signal into a baseband signal. To reduce generation of a DC offset, the AGC circuit includes: a variable gain amplifier having an amplifier circuit and a high-pass filter, the amplifier circuit amplifying the baseband signal with a variable gain and the high-pass filter coupled to the amplifier circuit and having a cut-off frequency which is variable; a controller supplying a gain control signal; and a blocker temporarily blocking the high frequency signal. Using the block control signal, the controller causes the blocker to start blocking the high frequency signal, before the cut-off frequency of the high-pass filter is switched from high to low.
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