Low power high frequency phase detector

Details Low power high frequency phase detector Low power high frequency phase detector

2006-06-06

2006-06-06

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S012000

Reexamination Certificate

active

07057432

ABSTRACT:
A phase detector employs a modified logic gate in conjunction with a set/reset latch to make a phase detector that generates control outputs for use in increasing and decreasing the delay in a delay circuit in the path of a feedback clock generated by delaying a reference clock. The delay circuit provides a controllable delay from less than to greater than one clock cycle of the reference clock. The phase detector generates an up control (UP) signal for increasing delay when the feedback clock leads the reference clock and a down control (DN) signal for decreasing delay when the feedback clock lags the reference clock. The UP signal and DN signal are updated each clock cycle when the leading clock edge makes a transition.

REFERENCES:
patent: 6683478 (2004-01-01), Yoo
patent: 6690209 (2004-02-01), Cyrusian

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