Electronic digital logic circuitry – Clocking or synchronizing of logic stages or gates – Field-effect transistor
Reexamination Certificate
2006-04-25
2006-04-25
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Clocking or synchronizing of logic stages or gates
Field-effect transistor
C326S095000
Reexamination Certificate
active
07034576
ABSTRACT:
A circuit has been developed that reduces the effective strength of a keeper circuit during an interval in which at least one path of an evaluation circuit is sensitive to a keeper device. The keeper circuit includes a keeper gating device coupled to a keeper device that is responsive to a keeper control. The keeper device is sized to overcome leakage current in the evaluation circuit. In some configurations, the keeper circuit includes a weak keeper device that is minimally sized to overcome noise while the keeper device is effectively disabled. In some configurations, the reduction in effective strength of the keeper circuit occurs before arrival of the fastest signal coupled to a sensitive output path of the evaluation circuit and the effective strength is restored after arrival of the slowest signal coupled to the sensitive output path of the evaluation circuit.
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Neil H. E. Weste and Kamran Eshraghian, Principles of CMOS VLSI Design, A Systems Perspective, Second Edition, Addison-Wesley Publishing Co., Copyright 1993 by AT&T, pp. 298-303, no month.
Eleyan Nadeem
Kim Hong
Levy Howard
Sharma Harsh
Sun Microsystems Inc.
Tan Vibol
Zagorin O'Brien Graham LLP
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