Loop circuitry with low-pass noise filter

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

2006-02-21

2006-02-21

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000, C327S160000

Reexamination Certificate

active

07002384

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 et al.
patent: 5771264 (1998-06-01), Lane
patent: 6437650 (2002-08-01), Sung et al.
patent: 6504408 (2003-01-01), von Kaenel

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