System for providing open-loop quadrature clock generation

Oscillators – Ring oscillators

Reexamination Certificate

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Details

C331S045000, C331S074000, C327S156000

Reexamination Certificate

active

07612621

ABSTRACT:
A system for providing open-loop quadrature clock generation. The system is implemented by a ring oscillator structure that includes input inverters for receiving an input clock, forward direction loop inverters, backward direction loop inverters, one or more outputs, and cross-coupled latches connected between any two opposite nodes.

REFERENCES:
patent: 5565817 (1996-10-01), Lakshmikumar
patent: 7057433 (2006-06-01), Cho
patent: 7135935 (2006-11-01), Kim
patent: 7199630 (2007-04-01), Kim
patent: 7362187 (2008-04-01), Lai et al.
patent: 2004/0222829 (2004-11-01), Cho
patent: 2007/0090866 (2007-04-01), Park
patent: 2007/0090867 (2007-04-01), Kim
patent: 2007/0109032 (2007-05-01), Park
patent: 2007/0109058 (2007-05-01), Kim
patent: 102004042900 (2005-04-01), None
patent: 2005094754 (2004-04-01), None
patent: 2007006492 (2007-01-01), None

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