Phase and frequency comparator

Details Phase and frequency comparator Phase and frequency comparator

1974-04-30

1976-03-30

Kaufman, Nathan

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307232, 328134, H04B 102

Patent

active

039477754

ABSTRACT:
The comparator comprises a circuit for detecting the sign of the phase-shift of the reference signal relatively to the second signal for a predetermined phase of the latter. It delivers a corresponding binary phase difference signal.
A second circuit selects those changes in values of the phase difference signal which occur for a phase of the reference signal comprised in a predetermined phase interval, and are thus surely representative of a change in the sign of the frequency difference.

REFERENCES:
patent: 3441745 (1969-04-01), Reeves et al.
patent: 3460034 (1969-08-01), Tanner
patent: 3646455 (1972-02-01), Coccagna
patent: 3723889 (1973-03-01), Oberst
patent: 3755746 (1973-08-01), Hogue et al.

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