Frequency comparator

Details Frequency comparator Frequency comparator

2008-05-27

2008-05-27

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S039000

Reexamination Certificate

active

11381139

ABSTRACT:
A frequency comparator comparing frequencies of a first clock signal and a reference clock signal. The frequency comparator includes a phase-frequency detector and a comparison module. The phase-frequency detector receives the first clock signal and the reference clock signal, and outputs an up clock signal and a down clock signal. The pulse-width difference between the up clock signal and the down clock signal corresponds to the phase difference between the first clock signal and the reference clock signal. The comparison module compares the frequencies of the first clock signal and the reference clock signal based on how many times the pulse width of the up clock signal is larger or shorter than that of the down clock signal in a predetermined period.

REFERENCES:
patent: 5740213 (1998-04-01), Dreyer
patent: 6005425 (1999-12-01), Cho
patent: 6919759 (2005-07-01), Chuan
patent: 7061290 (2006-06-01), Hasegawa
patent: 7129789 (2006-10-01), Hsiao et al.
patent: 7256656 (2007-08-01), Wu

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