Operational amplifier circuit utilizing resistors trimmed by met

Details Operational amplifier circuit utilizing resistors trimmed by met Operational amplifier circuit utilizing resistors trimmed by met

1986-04-28

1987-07-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330298, 330307, 357 51, H03F 345

Patent

active

046834427

ABSTRACT:
A method for trimming a diffused or implanted resistor located within an integrated circuit is disclosed. This technique for trimming a resistor requires the use of high current pulses and geometric shaped metal contacts. The current pulses react with the electropositive metal atoms in the thin film conductor and cause the metal atoms to migrate to another location, thus altering the value of the resistor by progressively decreasing the conductivity of the resistor. An operational amplifier circuit utilizing resistors trimmed by metal migration is also disclosed.

REFERENCES:
patent: 3206340 (1965-09-01), Stelmak
patent: 3600797 (1971-08-01), Bower et al.
patent: 3629782 (1971-12-01), Sahni
patent: 3851270 (1974-11-01), Vosteen
patent: 4377423 (1983-03-01), Anthony
patent: 4534100 (1985-08-01), Lane
Faber, "Algorithmic Trimming on Active Circuitry", Proceedings, 1974, 24th Electronic Components Conference, pp. 248-254.

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