Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Signal transmission integrity or spurious noise override
Patent
1997-02-14
1998-08-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Signal transmission integrity or spurious noise override
327387, 327389, 327391, 327427, 327434, 327437, H03K 1716, H03K 17687
Patent
active
057899649
ABSTRACT:
Decoupling capacitors are activated by high current impulses that occur due to electrical over stress or electrostatic discharge, which occurs when the chip is powered off with no additional control signal or feedback elements. The high current or high voltage impulse is used to activate a rise time network, which turns on an electric switch, enabling the capacitor network. The basic circuit can be modified to address the situation where a failed decoupling capacitor needs to be switched out. In this modification, there is in addition to the three basic elements listed above, a feedback element connected between the decoupling capacitor and the switch. This feedback element operates to turn the electronic switch off when the decoupling capacitor is leaky. A further modification of the basic invention allows the decoupling capacitor to be used as a decoupling transistor during chip operation and as a capacitor during electrostatic discharge (ESD) testing or an ESD event.
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Callahan Timothy P.
International Business Machines - Corporation
Luu An T.
Schkurko, Esq. Eugene
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