Circuit and structure for protecting integrated circuits from de

Details Circuit and structure for protecting integrated circuits from de Circuit and structure for protecting integrated circuits from de

1985-03-11

1986-12-30

Clawson, Jr., Joseph E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

357 13, 357 39, 357 35, 361 56, 361 91, H01L 2978

Patent

active

046332839

ABSTRACT:
A protection circuit comprises first and second circuit to respectively protect an IC against negative and positive going transients in an input signal. If the input includes a repetitive signal greater than a threshold for firing the negative going protection circuit, substrate current injection and signal clamping will result. To prevent this, the first circuit includes an emitter-base shunt resistor and a Zener diode coupled to a pair of opposite conductivity type transistors to lower the threshold thereof. Each of the circuits comprises a pair of opposite conductivity type transistors formed in a single isolated region, which in turn is formed in an opposite conductivity type substrate.

REFERENCES:
patent: 3573550 (1969-03-01), Baker, Jr.
patent: 4377832 (1983-03-01), Toney et al.
patent: 4400711 (1983-08-01), Avery
patent: 4484244 (1984-11-01), Avery
G. Feth et al., "Planar Triac Structures", IBM Tech. Discl. Bull, vol. 19 #6, Nov. 1976, pp. 2297-2301.
D. Goldthorp et al., "Integ. Ckt. Comp. PNPN Diode", 1979 IEDM, Ch 1504, pp. 180-183.

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