Direct conversion FM receiver with offset
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United States of America Patent
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-
Jul 24, 1990
Grant Date -
N/A
app pub date -
Aug 9, 1988
filing date -
Aug 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A direct conversion FM receiver that includes AC coupling and automatic gain control employs an offset frequency at the first local oscillator. The offset frequency prevents the frequency spectrum occupied by the signal modulation from being affected by AC coupling. The offset frequency is chosen so that it translates the frequency spectrum of the received signal outside the DC notch created in the spectrum by the AC coupling. To conserve battery supplied power, an error amplifier coupled between the output of the receiver and the first local oscillator maintains the offset frequency after it has been established by a frequency synthesizer, which is then turned off.
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