Apparatus to shift to pre-charge mode a dynamic circuit...

Details Apparatus to shift to pre-charge mode a dynamic circuit... Apparatus to shift to pre-charge mode a dynamic circuit...

2007-08-14

2007-08-14

Chang, Daniel (Department: 2819)

Electronic digital logic circuitry

Clocking or synchronizing of logic stages or gates

Field-effect transistor

C326S121000, C365S203000, C327S544000

Reexamination Certificate

active

11099186

ABSTRACT:
A method and apparatus for shifting a dynamic circuit, driven by a one-shot clock, to a pre-charge mode, during a power-off mode, is provided. Under certain conditions, a floating node may be present in a dynamic circuit. One approach to prevent floating nodes involves the generation of a new one-shot clock signal that is supplied to the last dynamic circuit in the series of dynamic circuits before the output flop (“the final dynamic circuit”). The new one-shot clock signal is driven to a logical low value when the power-off signal has a logical high value. Another approach to prevent floating nodes involves modifying the final dynamic circuit to include a structure that, when the power-off signal has a logical high value, drives the dynamic node to either a logical high value or a logical low value to prevent the dynamic node from becoming a floating node.

REFERENCES:
patent: 5453708 (1995-09-01), Gupta et al.
patent: 6429689 (2002-08-01), Allen et al.
patent: 6873188 (2005-03-01), Belluomini et al.
patent: 2002/0057112 (2002-05-01), Ye et al.

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