Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1998-11-03
2000-06-06
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361111, H02H 904
Patent
active
060726776
ABSTRACT:
An electrostatic discharge protective circuit formed by use of a silicon controller rectifier is coupled to an input port and an internal circuit for discharging electrostatic charges on the input port to ground. When the electrostatic charges are applied on the input port, a punch-through effect is created between a first P-type diffusion region and a second N-type diffusion region to turn on a parasitic NPN bipolar junction transistor. At the same time, a voltage is applied on a gate of the MOS transistor via a small-signal equivalent capacitor to turn on itself, thereby discharging the electrostatic charges. Accordingly, the trigger voltage of the silicon controller rectifier can be efficiently lowered to improve the electrostatic discharge protective capability of the silicon control rectifier.
REFERENCES:
patent: 5400202 (1995-03-01), Metz et al.
patent: 5671111 (1997-09-01), Chen
patent: 5682047 (1997-10-01), Consiglio et al.
patent: 5869873 (1999-02-01), Yu
Chen Mainn-Gwo
Chen Ming-Jer
Liu Chuan H.
Gaffin Jeffrey
Huynh Kim
United Microelectronics Corp.
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