Digital frequency detector
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United States of America Patent
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Mar 22, 1988
Grant Date -
N/A
app pub date -
Apr 15, 1986
filing date -
Apr 15, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A frequency detector completely implemented with digital logic circuitry is disclosed. The frequency detector hereof employs a unique phase locked loop digitally implemented with asynchronous ripple counters, and a digitally implemented amplitude comparator and signal integrator. The detector is especially adapted for implementation in CMOS hardware, or similar hardware having low current drain characteristics. The selectivity of the detector can be set to a narrow bandwidth for excellent noise discrimination characteristics.
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