Shielded transistor device

Details Shielded transistor device Shielded transistor device

1989-06-20

1991-02-19

Hille, Rolf

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330253, 330261, 3072962, 3072964, 3072965, 3072968, H01L 2940

Patent

active

049948911

ABSTRACT:
The invention comprises an operational amplifier circuit having a shielded transistor device whose drain is surrounded by a gate comprising an annular ribbon of polysilicon. The gate is connected to a trackable potential that fluctuates but is keyed to a voltage slightly above the average between the positive and negative circuit bias. The shielded transistor device allows the operational amplifier circuit of which it is a part to function at extended voltage levels of 12 volts.

REFERENCES:
patent: 4288802 (1981-09-01), Ronen
patent: 4290078 (1981-09-01), Ronen
patent: 4308549 (1981-12-01), Yeh
patent: 4412242 (1983-10-01), Herman et al.
patent: 4634894 (1987-01-01), Shu et al.
patent: 4692689 (1987-09-01), Takemae
patent: 4788455 (1988-11-01), Mori et al.

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