Automatic frequency control in FSK receiver using voltage window deviation
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United States of America Patent
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-
Dec 18, 2001
Grant Date -
N/A
app pub date -
Dec 14, 1998
filing date -
Dec 12, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An AFC circuit for controlling an oscillation frequency of a local oscillator is disclosed. An f/V converter converts a frequency of an FSK signal to a received signal voltage varying depending on the frequency of the FSK signal. A window generator generates a voltage window including a reference voltage corresponding to a center frequency of the FSK signal. The oscillation frequency of the local oscillator is controlled depending on a deviation of the received signal voltage from the voltage window so that the received signal voltage falls into the voltage window.
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