Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By pulse width or spacing
Reexamination Certificate
2010-01-07
2010-11-23
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By pulse width or spacing
C363S028000
Reexamination Certificate
active
07839181
ABSTRACT:
Circuits and methods of suppressing signal glitches in an integrated circuit (IC). A glitch on a signal entering a clock buffer, for example, is prevented from propagating through the clock buffer. In some embodiments, a latch is added to an input clock path that detects a transition on the input signal, and then ignores any subsequent transitions for a time delta that is determined by a delay circuit. In some embodiments, a multiplexer circuit is used to select between the input clock signal and the output clock signal, with changes on the input clock signal not being passed through the multiplexer circuit unless the time delta has already elapsed. In some embodiments, the delay is programmable, pin-selectable, or self-adapting.
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Cartier Lois D.
Donovan Lincoln
Hiltunen Thomas J
Xilinx , Inc.
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