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United States of America Patent
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Issued Date -
Dec 3, 2009
app pub date -
Nov 8, 2006
filing date -
Apr 4, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
By A/D converting a signal output from a mixer (4) and inputting the A/D converted signal to a DSP (8), and generating AGC control data (D.sub.L) corresponding to a level of the signal to control a gain of an LNA (3) in such a manner that a voltage input to an A/D converting circuit (7) is lower than a full scale voltage of the A/D converting circuit (7), it is possible to prevent a signal having an excessively high level beyond a dynamic range of the A/D converting circuit (7) from being input to the A/D converting circuit (7). By controlling the gain of the LNA (3) corresponding to a level of a broad band signal before passing through a BPF (11) and controlling a gain of an IF amplifier (12) corresponding to a level of a narrow band signal after passing through the BPF (11), moreover, it is possible to properly control a gain of an AGC as a whole in consideration of signal levels of both a desirable wave and a disturbing wave.
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