FSK Demodulator employing a switched capacitor filter and period counters
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United States of America Patent
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May 14, 1985
Grant Date -
N/A
app pub date -
Nov 5, 1981
filing date -
Nov 7, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An FSK demodulation circuit especially suited for integrated construction is provided. The demodulating circuit uses N counters and a counter selector circuit for sequentially switching the counters at every zero-cross point in the received FSK signal. Sensitivity of demodulation is improved by N-time zero-cross detection rather than counting the time between two adjacent zero-cross points. The FSK demodulation circuit uses a Switched Capacitor Bandpass Filter whose characteristics are changed by changing the frequency of an internal clock using simple dividing circuitry.
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