Analog zero if FM decoder and embodiments thereof, such as the family radio service
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United States of America Patent
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Apr 24, 2007
Grant Date -
N/A
app pub date -
Jan 3, 2000
filing date -
Jan 22, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system for directly down-converting FM signals to demodulated baseband information signals that can be used to directly down-convert analog FM signals and digital FM signals to demodulated baseband information signals. In an embodiment, the method includes aliasing an FM signal at an aliasing rate substantially equal to the frequency of the FM signal or substantially equal to a sub-harmonic thereof; adjusting the aliasing rate in accordance with frequency changes on the FM signal to maintain the aliasing rate substantially equal to the frequency of the FM signal, and outputting a demodulated baseband information signal. The method optionally includes compensating for phase delays and/or other characteristics of the loop in order to maintain bandwidth and stability for the loop.
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