Edge detector and method

Details Edge detector and method Edge detector and method

2006-03-21

2006-03-21

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By pulse coincidence

C327S012000

Reexamination Certificate

active

07015726

ABSTRACT:
Embodiments of an edge detector and related methods are disclosed. One method embodiment for detecting the rising and/or falling edge of an input clock signal of unknown phase and frequency includes providing a reference clock signal of a known phase and frequency to an edge detection circuit; dividing and phase shifting the reference clock signal to provide a plurality of meta flip-flop clock signals; providing the plurality of meta flip-flop clock signals and an input clock signal to a plurality of flip-flop pairs that provide meta-stability resolution; selecting the earliest output signal of the plurality of flip-flop pairs to register a transition on the input clock signal; providing a signal corresponding to the transition to an edge detection circuit; and providing an edge detect indication at the edge detection circuit during one of the corresponding high and low phase of the input clock signal.

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patent: 2005/0162199 (2005-07-01), Green et al.

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