Transistor protection circuit and method

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver

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Details

327427, 327327, H03B 100, H03K 17687

Patent

active

058923799

ABSTRACT:
A circuit and method protect a transistor (68, 70) from damage when controlling an input signal (V.sub.PROG) that exceeds a gate to channel stress voltage of the transistor. A small, low current protection transistor (64, 66) is serially coupled to the gate electrode of the transistor being protected. The gate of the protection transistor is biased to a voltage (V.sub.P, V.sub.N) of lower magnitude than the input signal to limit the voltage applied to the gate of the protected transistor to a value within the stress voltage of the protected transistor.

REFERENCES:
patent: 3947727 (1976-03-01), Stewart
patent: 4508978 (1985-04-01), Reddy
patent: 4678950 (1987-07-01), Mitake
patent: 5064453 (1991-11-01), Pedersen

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