Phase locked loop carrier recovery circuit with false lock preve

Details Phase locked loop carrier recovery circuit with false lock preve Phase locked loop carrier recovery circuit with false lock preve

1979-12-27

1981-10-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

329 50, 329124, 331 12, 331 17, 331DIG2, H03L 710

Patent

active

042976502

ABSTRACT:
A carrier recovery apparatus for phase modulated waves including phase-locked loops is operable to prevent false locks. The apparatus includes a clock recovery circuit which generates a signal in response to a modulated carrier, a first phase comparator responsive to the modulated carrier and the output of a VCO, a second phase comparator responsive to the first phase comparator and the clock signal, and a control device for superimposing the low frequency component of the output of the second phase comparator on the output of the first phase comparator or a loop filter which controls the VCO.

REFERENCES:
patent: 3768030 (1973-10-01), Brown et al.
patent: 4000476 (1976-12-01), Walker et al.

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