Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Reexamination Certificate
2005-04-12
2005-04-12
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
C327S115000, C326S039000
Reexamination Certificate
active
06879202
ABSTRACT:
A digital frequency synthesizer (DFS) circuit adds little additional delay on the clock path. True and complement versions of an input clock signal are provided to a first and second passgates, respectively. Under the direction of a control circuit, the passgates pass selected rising edges of the true clock signal, and selected falling edges of the complement clock signal, to an output clock terminal of the DFS circuit. When neither the true nor the complement clock signal is passed, a keeper circuit retains the value already present at the output clock terminal. In some embodiments, both passgates can be disabled and a ground or power high signal can be applied to the output terminal. Other embodiments include PLDs in which the DFS circuits are employed to allow individual clock control for each programmable logic block.
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Cartier Lois D.
Xilinx , Inc.
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