Digital frequency detector

Details Digital frequency detector Digital frequency detector

1986-04-15

1988-03-22

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

307516, 307514, G01R 2310

Patent

active

047331690

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.

REFERENCES:
patent: 3742353 (1973-06-01), Parisi
Pages 38-43 from Texas Instruments Incorporated Publication, D2629, dated Jan. 1981.

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