Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Reexamination Certificate
2005-12-27
2005-12-27
Cho, James H. (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
C326S083000
Reexamination Certificate
active
06980018
ABSTRACT:
A buffer/driver having large output devices for driving multiple loads is configured with three parallel paths. The first logic path is made of small devices and is configured to provide the logic function of the buffer without the ability to drive large loads. Second and third logic paths have the logic function of the first logic path up to the last inverting stage. The last inverting stage in each path is a single device for driving the logic states of the buffer output. The second and third logic paths have power-gating that allows the input to the pull-up and pull-down devices to float removing gate-leakage voltage stress. When the second and third logic paths are power-gated, the first logic path provides a keeper function to hold the logic state of the buffer output. The buffer may be an inverter, non-inverter, or provide a multiple input logic function.
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Kuang Jente B.
Ngo Hung C.
Nowka Kevin J.
Cho James H.
Frankeny Richard F.
Internatiional Business Machines Corporation
Salys Casimer K.
Winstead Sechrest & Minick P.C.
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