Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Reexamination Certificate
2007-08-14
2007-08-14
Cho, James H. (Department: 2819)
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
C326S098000
Reexamination Certificate
active
11089956
ABSTRACT:
Disclosed are keeper circuits for electronic circuits that selectively maintain the voltage level of an intermediate circuit node at a desired level. In one exemplary embodiment, a keeper transistor either provides current or drains current from the intermediate node to maintain the desired voltage level in response to a signal to do so. The keeper circuit works against a leakage current that either drains current from the node or supplies current to the node. A current-setting transistor is coupled in series with the keeper transistor to set the maximum current through the keeper circuit to a value that is related to this leakage current, preferably tracking the leakage current. With this construction, the current-setting transistor is able to track variations in the leakage current caused by variations in the manufacturing process, and thereby provide dynamic leakage compensation.
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Lih Yolin
Walker William W.
Cho James H.
Fujitsu Limited
Sheppard Mullin Richter & Hampton LLP
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