Escalator code-based delay-locked loop apparatus and...

Details Escalator code-based delay-locked loop apparatus and... Escalator code-based delay-locked loop apparatus and...

2005-01-25

2005-01-25

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S160000

Reexamination Certificate

active

06847242

ABSTRACT:
A delay-locked loop (DLL) may include: a variable delay line arrangement operable to receive a reference clock and to output a delayed local clock; a phase comparator device operable to compare said reference clock and said local clock and to provide an up/down indication; and a delay control circuit, responsive to said up/down count-indication, to provide a reduced-noise delay control signal to said variable delay line arrangement, said delay control circuit being operable to count said up/down indication using an escalator code arrangement.

REFERENCES:
patent: 3573797 (1971-04-01), Kopelson
patent: 4795314 (1989-01-01), Prybella et al.
patent: 6215726 (2001-04-01), Kubo
patent: 6424199 (2002-07-01), Taguchi et al.
patent: 6680634 (2004-01-01), Ruha et al.

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