Trimmable current source

Details Trimmable current source Trimmable current source

1987-09-03

1988-08-23

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323354, 357 51, G05F 326

Patent

active

047663669

ABSTRACT:
A trimmable current source for use with low voltage circuitry includes a plurality of trimming networks. A voltage-divider circuit is connected to the trimming networks. Each of the trimming networks includes a resistor in an isolated epitaxial region series connected to a zener diode. A programming signal, having a voltage level which would normally damage the low voltage circuitry can be applied to the junction of the resistor and zener diode, and to the isolated epitaxial region containing the resistor of the trimming network to be programmed without damage to the low voltage circuitry.

REFERENCES:
patent: 3624530 (1971-11-01), Zwirn
patent: 3930304 (1976-01-01), Kellar et al.
patent: 4016483 (1977-04-01), Rudin
patent: 4055773 (1977-10-01), Shoeff
patent: 4225878 (1980-09-01), Dobkin
patent: 4238724 (1980-12-01), Klaus et al.
patent: 4280091 (1981-07-01), Hiltner
patent: 4412241 (1983-10-01), Nelson
patent: 4434358 (1984-02-01), Apfelbeck et al.
patent: 4608530 (1986-08-01), Bacrania

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