Loop circuitry with low-pass noise filter

Details Loop circuitry with low-pass noise filter Loop circuitry with low-pass noise filter

2007-04-17

2007-04-17

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000, C327S160000

Reexamination Certificate

active

11181366

ABSTRACT:
Phase comparators for use in loop circuits (i.e., DLL circuits and PLL circuits) are provided. The phase comparators include a phase detector for comparing a reference clock signal and a feedback signal derived from the loop circuit generated internal clock signal. The phase comparators also include a low-pass noise filter for filtering out erroneously detected phase differences between the reference clock signal and the feedback signal by requiring a certain net number of leading or lagging detections before the compensation circuitry of the loop circuit (i.e., the controlled delay line in a DLL circuit or the controlled oscillator in a PLL circuit) is adjusted. The number of net measurements required before these adjustments take place depends on a programmable bandwidth signal provided to the phase comparator.

REFERENCES:
patent: 5604775 (1997-02-01), Saitoh
patent: 5771264 (1998-06-01), Lane
patent: 6437650 (2002-08-01), Sung et al.
patent: 6504408 (2003-01-01), Von Kaenel
patent: 6856180 (2005-02-01), Starr et al.

Affiliated with

Also associated with

Rating

Loop circuitry with low-pass noise filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Loop circuitry with low-pass noise filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loop circuitry with low-pass noise filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3784300