Edge detector and method

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By pulse coincidence

Reexamination Certificate

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Details

Other Related Categories

C327S012000

Type

Reexamination Certificate

Status

active

Patent number

07015726

Description

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.

REFERENCES:
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patent: 5231636 (1993-07-01), Rasmussen
patent: 5313154 (1994-05-01), Norris
patent: 5315181 (1994-05-01), Schowe
patent: 6107841 (2000-08-01), Goodnow
patent: 6194927 (2001-02-01), Crowley et al.
patent: 2002/0050842 (2002-05-01), Soda
patent: 2003/0095619 (2003-05-01), Vallet et al.
patent: 2005/0162199 (2005-07-01), Green et al.

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