Digital DLL circuit

Details Digital DLL circuit Digital DLL circuit

2007-02-20

2009-12-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000, C327S152000, C327S153000, C327S161000

Reexamination Certificate

active

07636001

ABSTRACT:
A digital DLL circuit includes: a first register configured to hold a first delay specifying value to specify a delay of a rising edge side of a signal; a second register configured to hold a second delay specifying value to specify a delay of a falling edge side of a signal; and a digitally-controlled variable delay circuit configured to be allowed to individually control delays of a rise side and a fall side of a signal. The digital DLL circuit further includes a control circuit configured to implement control so that a rise-side delay and a fall-side delay by the variable delay circuit are kept at the first delay specifying value of the first register and the second delay specifying value of the second register, respectively.

REFERENCES:
patent: 6087868 (2000-07-01), Millar
patent: 2003/0012320 (2003-01-01), Bell
patent: 07-095022 (1995-04-01), None
patent: 11-273252 (1999-10-01), None
patent: 2002-076859 (2002-03-01), None
patent: 2004-531981 (2004-10-01), None
patent: 2005-142859 (2005-06-01), None
patent: 2005-168029 (2005-06-01), None
Marcovitz, Alan; Introduction to Logic Design; 2005; McGraw Hill; Second Edition; p. 368.

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