Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By pulse coincidence
Reexamination Certificate
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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Josephson Don Douglas
Tayler Michael Kennard
Zhu Quanhong
Almo Khareem E.
Hewlett--Packard Development Company, L.P.
Wells Kenneth B.
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