Circuit utilizing resistors trimmed by metal migration

Details Circuit utilizing resistors trimmed by metal migration Circuit utilizing resistors trimmed by metal migration

1986-09-18

1988-02-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330296, 330307, 357 51, H03F 310, H03F 345

Patent

active

047257911

ABSTRACT:
An operational amplifier of the type which includes first and second differentially coupled input transistors which cooperate with a current mirror circuit also includes a first and second RTMM resistors which may be individually trimmed to reduce input offset voltage. Each RTMM resistor is coupled from the power supply rail through first and second diodes respectively to the first and second input terminals. In this manner, signals appearing on the input terminals which exceed the rail voltage will cause currents to flow through the RTMM resistors thus reducing their resistance, and reducing offset voltage.

REFERENCES:
patent: 4606781 (1986-08-01), Vyne

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