Delay locked loop circuits and methods preventing erroneous...

Details Delay locked loop circuits and methods preventing erroneous... Delay locked loop circuits and methods preventing erroneous...

2006-04-25

2006-04-25

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S025000, C375S376000

Reexamination Certificate

active

07034590

ABSTRACT:
Delayed locked loop (DLL) circuits and methods using a coarse-fine lock structure which prevent malfunction due to jitter or noise that causes erroneous transitions from a coarse-lock to a fine-lock delay. A phase detector uses two feedback signals to detect a phase of an external clock signal (or reference signal) based on a phase difference between the two feedback signals, thereby enabling a more accurate determination as to when to transition from a coarse-lock to a fine-lock delay. The phase difference of the two feedback signals can be regulated by using frequency information to set a phase difference between the first and second feedback signals to renders the detection process more robust against noise or jitter over a wide frequency band from a low frequency to a high frequency, for determining when to transition from the coarse-lock to the fine-lock.

REFERENCES:
patent: 5744991 (1998-04-01), Jefferson et al.
patent: 6346837 (2002-02-01), Shibayama
patent: 6388485 (2002-05-01), Kim
patent: 6518807 (2003-02-01), Cho
patent: 6765976 (2004-07-01), Oh

Affiliated with

Also associated with

Rating

Delay locked loop circuits and methods preventing erroneous... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Delay locked loop circuits and methods preventing erroneous..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Delay locked loop circuits and methods preventing erroneous... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3577371