ESD protection apparatus and method for a high-voltage input...

Details ESD protection apparatus and method for a high-voltage input... ESD protection apparatus and method for a high-voltage input...

2005-11-15

2005-11-15

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

C361S091100

Reexamination Certificate

active

06965504

ABSTRACT:
An ESD protection apparatus for a high-voltage input pad comprises a modulator connected between the input pad and a snapback device with first and second guard rings surrounding the modulator, third guard ring surrounding the snapback device, and first and second guard ring control circuits to control the guard rings such that the protection apparatus has higher triggering and holding voltages under normal operation and lower triggering and holding voltages under ESD event.

REFERENCES:
patent: 5440151 (1995-08-01), Crevel et al.
patent: 5502328 (1996-03-01), Chen et al.
patent: 5986863 (1999-11-01), Oh
patent: 6274909 (2001-08-01), Chang et al.
patent: 6788507 (2004-09-01), Chen et al.
patent: 6791146 (2004-09-01), Lai et al.

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