Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Reexamination Certificate
2011-08-02
2011-08-02
Fureman, Jared (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
C361S111000
Reexamination Certificate
active
07990664
ABSTRACT:
An ESD protection circuit is integrated into the core of an FPGA in a distributed fashion coupling the bodies of one or more transistors to the power supply pin and/or the ground pin of the FPGA. The ESD protection circuit includes one or more positive discharge paths and one or more negative discharge paths. In the case of a positive ESD event, the positive discharge paths are on and the negative discharge paths are off. In the case of a negative ESD event, the positive discharge paths are off and the negative discharge paths are on. In either event, the bodies of the transistors track the voltages at the power supply pin and/or the ground pin to protect the core from being by damaged by electrostatic discharge.
REFERENCES:
patent: 5859758 (1999-01-01), Kim
patent: 6552879 (2003-04-01), Voldman
patent: 7446378 (2008-11-01), Bakker
patent: 2007/0058307 (2007-03-01), Mergens et al.
Gallerano Antonio
Huang Cheng-Hsiung
Perisetty Srinivas
Watt Jeffrey T.
Altera Corporation
Fureman Jared
Thomas Lucy
Ward and Olivo LLP
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