Delay locked loops and methods using ring oscillators

Details Delay locked loops and methods using ring oscillators Delay locked loops and methods using ring oscillators

2007-04-03

2007-04-03

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

11158013

ABSTRACT:
Delay locked loops include a ring oscillator having serially connected inverters and a feedback path around the serially connected converters. The ring oscillator is configured to generate an output clock signal that is a delayed version of an input clock signal, in response to the input clock signal and to a control signal that is applied to the ring oscillator. A phase responsive circuit is configured to generate the control signal in response to a phase difference between the input clock signal and the output clock signal. Analogous methods of delaying a clock signal also are described.

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Notice to Submit Response for Korean Patent Application No. 10-2004-0081352 mailed on Feb. 28, 2006.

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