Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Reexamination Certificate
2007-02-27
2007-02-27
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
C327S020000, C327S099000
Reexamination Certificate
active
10973258
ABSTRACT:
A clock switching circuit suitably adapted to stable switching operation of high-frequency multiphase clock signals. The clock switching circuit receives two clock signals and selectively outputs one of the two clock signals in accordance with a selection signal. The clock switching circuit includes a switching controller that transfers the selection signal at the beginning of a period in which both of the two clock signals are active, and an internal selector that selectively outputs one of the two clock signals in response to the selection signal transferred from the switching controller.
REFERENCES:
patent: 5550489 (1996-08-01), Raab
patent: 6229364 (2001-05-01), Dortu et al.
patent: 6300816 (2001-10-01), Nguyen
patent: 6822478 (2004-11-01), Elappuparackal
patent: 6845490 (2005-01-01), Natsume
patent: 6891401 (2005-05-01), Starr et al.
Arent & Fox LLP
Callahan Timothy P.
Luu An T.
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