Phase and frequency lock detector

Details Phase and frequency lock detector Phase and frequency lock detector

2006-01-24

2006-01-24

Vo, Don N. (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C327S156000, C331SDIG002

Reexamination Certificate

active

06990165

ABSTRACT:
A lock detector and method is provided for detecting lock between first and second signals. The lock detector includes a pulse generator for receiving the first signal and generating a pulse train from the first signal. Each pulse corresponds to at least one of rising and falling edges of the first signal in each period of the first signal. The lock detector also includes a mask generator for generating a mask signal from the second signal such that the mask signal has a mask state around at least one of rising and falling edges of the second signal in each period of the second signal. Additionally, the lock detector has a logic gate, which receives the pulse train and the mask signal from the pulse generator and the mask generator, respectively. The logic gate generates an incrementing pulse signal by combining the pulse train with the mask signal.

REFERENCES:
patent: 5175767 (1992-12-01), Landry
patent: 5602513 (1997-02-01), De Loe, Jr.
patent: 5949203 (1999-09-01), Buthker
patent: 2003/0169836 (2003-09-01), Ebuchi et al.

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