Protection circuit for discharging large amount of static charge

Details Protection circuit for discharging large amount of static charge Protection circuit for discharging large amount of static charge

1998-09-04

2000-07-25

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 56, H02H 322

Patent

active

060943327

ABSTRACT:
A protection circuit has a series combination of a p-channel enhancement type field effect transistor, a first node and a first resistor connected between a high voltage line and a low voltage line and a series combination of a second resistor, a second node and an n-channel enhancement type field effect transistor also connected between the high voltage line and the low voltage line, and the first node and the second node are respectively connected to the gate electrode of the n-channel enhancement type field effect transistor and the gate electrode of the p-channel enhancement type field effect transistor; when one of the field effect transistors is broken down between the source node and the drain node due to abnormal voltage applied between the high voltage line and the low voltage line, the associated resistor varies the potential level at the gate electrode of the other of the field effect transistors due to the break-down current passing therethrough, and causes the other of the field effect transistors to turn on so as to increase the current discharging capability of the protection circuit.

REFERENCES:
patent: 3555374 (1971-01-01), Usuda
patent: 5012317 (1991-04-01), Rountre
patent: 5225702 (1993-07-01), Chatterjee
patent: 5610425 (1997-03-01), Quigley et al.
patent: 5675469 (1997-10-01), Racino et al.

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