False frequency lock detector

Details False frequency lock detector False frequency lock detector

2011-05-03

2011-05-03

Corrielus, Jean B (Department: 2611)

Pulse or digital communications

Synchronizers

C331SDIG002, C327S141000, C327S160000

Reexamination Certificate

active

07936853

ABSTRACT:
A system and method are provided for detecting a false clock frequency lock in a clock and data recovery (CDR) device. The method accepts a digital raw data signal at a first rate and counts edge transitions in the raw data signal, creating a raw count. A clock signal is also accepted at a second rate. The clock signal is a timing reference recovered from the raw data signal. The raw data signal is sampled at a rate responsive to the clock signal, generating a sampled signal. Edge transitions are counted in the sampled signal, creating a sampled count. Then, the raw count is compared to the sampled count, to determine if the first rate is equal to the second rate. The method is used to determine if the second rate is less than the first rate—to detect if the clock signal is incorrectly locked to the first rate.

REFERENCES:
patent: 6331792 (2001-12-01), Tonietto
patent: 6853696 (2005-02-01), Moser et al.
patent: 7424082 (2008-09-01), Choi
patent: 7668271 (2010-02-01), Kim et al.
patent: 2004/0001483 (2004-01-01), Schmidt et al.

Affiliated with

Also associated with

Rating

False frequency lock detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with False frequency lock detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and False frequency lock detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2693222