Method and system for a lock detector for a phase-locked loop

Details Method and system for a lock detector for a phase-locked loop Method and system for a lock detector for a phase-locked loop

2007-01-02

2007-01-02

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S025000, C331SDIG002

Reexamination Certificate

active

11101985

ABSTRACT:
A lock detector receives a feedback signal from a phase-locked loop and a reference signal. The lock detector includes a first generator for receiving the reference and feedback signals, and for sampling the feedback signal with the reference signal. A second generator is coupled to the first generator for incrementing a count when the feedback signal is at different polarities at consecutive edges of the reference signal. An output line, for asserting a phase lock when the count reaches a defined value, is coupled to the second generator.

REFERENCES:
patent: 6794944 (2004-09-01), Hirai

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