Input protection device for C-MOS device

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357 42, 357 2313, H01L 2980, H01L 2978, H01L 2702

Patent

active

048720453

ABSTRACT:
An input protection device for a C-MOS device having an n-type semiconductor substrate and a p-type well region. The device comprises a diode consisting of the p-type well region and an n.sup.+ -type layer diffusion formed in the p-type well region and connected between a gate of a C-MOS FET and ground. The n.sup.+ -type layer of the diode has a higher impurity concentration and a greater diffusion depth than those of n.sup.+ -type layers formed in the p-type well region and constitute the source and drain of an n-channel MOSFET.

REFERENCES:
patent: 3667009 (1972-05-01), Rugg
"C-MOS/SOS LSI Input/Output Protection Network", (8/1978)--B. T. Ahlport et al.
"Gate Protection of MIS Devices"--M. Lenzlinger--(Apr. 1971).

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