Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2005-08-02
2005-08-02
Nguyen, Minh (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S122000, C327S299000, C377S043000
Reexamination Certificate
active
06924684
ABSTRACT:
Phase shifter circuits and methods use counters to define the positions of the output clock edges. A plurality of counters are each clocked by a count clock relatively much faster than the input clock. A first counter counts for one input clock period, and a delay value is determined based at least in part on the counted value. In some embodiments, the delay value has a maximum value that depends on the counted value. The delay value is provided to a second counter, which counts from zero to the delay value and generates a pulse one delay value after the beginning of the input clock period. A third counter running at the same clock rate generates a pulse after an additional delay. The pulses from the counters are used to provide output clock edges at predetermined times during the input clock cycle. Some circuits also perform a duty cycle correction.
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U.S. Appl. No. 10/651,811, filed Aug. 29, 2003, Nguyen.
Cartier Lois D.
Nguyen Minh
XILINX Inc.
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