Frequency comparison circuit

Details Frequency comparison circuit Frequency comparison circuit

1976-11-19

1977-11-22

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328 44, 324 78D, 324 78Z, 328 55, H03D 1300

Patent

active

040598047

ABSTRACT:
A frequency comparison circuit for determining, at least within certain limits of accuracy, whether the frequency of a received signal is equal or not to a frequency F. Generating means produce first and second reference signals at frequency F, in phase quadrature. A logic circuit periodically compares the signs m, p and q of the received signal and of the two reference signals and according to the results of these comparisons (m, p and q alike, or m different from p and q, or q different from m and p and p different from m and q) applies a pulse to the plus or minus input of a first bidirectional counter or to the plus or minus input of a second bidirectional counter, one of the two counters overflowing when the frequency of the received signal is sufficiently close to F. In a variant embodiment the second reference signal has a frequency 2F.

REFERENCES:
patent: 3200340 (1965-08-01), Dunne
patent: 3626307 (1971-12-01), Koyama
patent: 3735324 (1973-05-01), Phillips
patent: 3956705 (1976-05-01), Mayer

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