Phase-frequency comparator for phase-locked loops

Details Phase-frequency comparator for phase-locked loops Phase-frequency comparator for phase-locked loops

1986-11-06

1988-09-20

Heyman, John S.

Oscillators

Relaxation oscillators

331 1A, G01R 2508

Patent

active

047728523

ABSTRACT:
An instantaneous comparison unit with an associated sequential state logic circuit is described which functions to maintain a condition of phase locking with a reference signal which is substantially immune to disturbances which cause losses or additions of signal fronts. Continuous phase shifting conditions during the transient, which precedes phase locking, is detected and compensated for by the disclosed circuit.

REFERENCES:
patent: 3599102 (1971-08-01), Mous
patent: 3849671 (1974-11-01), Molack
patent: 4123704 (1978-10-01), Johnson
patent: 4339731 (1982-07-01), Adams
patent: 4668917 (1987-05-01), Levine

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