Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2005-11-08
2005-11-08
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S254000
Reexamination Certificate
active
06963236
ABSTRACT:
Quadrature clock generating apparatus includes a multiplexer selecting one of a generated clock and a gated generated clock as a double clock in accordance with a halt multiplexer control. Divider circuitry provides an alignment signal corresponding to an inverted double clock divided by two. A recovery circuit recovers first and second clocks having a 90° phase difference from the double clock in accordance with the alignment signal. A halt circuit controls the halt multiplexer control to select the gated generated clock when the alignment signal matches a pre-determined clock level. The halt multiplexer control is clocked by the generated clock.
REFERENCES:
patent: 6282413 (2001-08-01), Baltus
patent: 6337976 (2002-01-01), Kudou
patent: 6466086 (2002-10-01), Syoji
patent: 6545546 (2003-04-01), Takeshita et al.
Berkram Daniel A.
Wyatt Perry M.
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