Phase detector

Details Phase detector Phase detector

2004-12-07

2009-02-03

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S355000, C375S373000, C375S375000, C375S376000, C327S525000

Reexamination Certificate

active

07486756

ABSTRACT:
A phase detector is applied for detecting the phase difference between a data signal and a clock signal, and outputting a first up signal whose pulse width is between 1/2 and 3/2 period of the clock signal, a first down signal, a second down signal, and a second up signal whose periods are equal to the period of the clock signal to a charge pump. The pulse width of the first up signal varies with the difference between the falling edge of the clock signal and the data signal. Besides, the falling edge of the first up signal of the invention is aligned to the falling edge of the clock signal, and is unrelated to the pulse of the data signal. The invention utilizes the up signal and down signal which are more accurate to resolve the unlock problem due to the divergence of the phase error signal.

REFERENCES:
patent: 6256362 (2001-07-01), Goldman
patent: 6392456 (2002-05-01), Pyeon et al.
patent: 6438178 (2002-08-01), Lysdal et al.
patent: 6735731 (2004-05-01), Ewen et al.
patent: 2001/0055355 (2001-12-01), Okamoto
patent: 2004/0146131 (2004-07-01), Wilson
patent: 2004/0247066 (2004-12-01), Suda
patent: 2004/0257118 (2004-12-01), Galloway et al.

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