Phase comparator with dual phase detectors

Details Phase comparator with dual phase detectors Phase comparator with dual phase detectors

1978-12-22

1980-04-29

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

307232, 328133, 328155, 331 11, 331 14, 331 27, H03B 304, H03K 117, H03K 520

Patent

active

042008450

ABSTRACT:
A phase comparator for a digital phase locked loop which provides first and second order error signals for phase and frequency correction of a voltage controlled oscillator in the loop with respect to data being read for self synchronization of the data. A first order error signal is generated in a first phase detector which operates only during a VCO "unsafe" condition, i.e., when a data pulse is beyond a present limit. A finer, second order error signal is generated in a second phase detector which operates only during a VCO "safe" condition, i.e., when a data pulse is within a preset limit.

REFERENCES:
patent: 3944940 (1976-03-01), Desai
patent: 4069462 (1978-01-01), Dunn
patent: 4080576 (1978-03-01), Huber et al.

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