Bias current compensated operational amplifier circuit

Details Bias current compensated operational amplifier circuit Bias current compensated operational amplifier circuit

1976-12-20

1978-10-31

Dahl, Lawrence J.

Amplifiers

Sum and difference amplifiers

330107, 330109, 330146, H03F 345

Patent

active

041237218

ABSTRACT:
Operational amplifier circuitry is provided which comprises an operational amplifier having a first input port and a second input port, and a compensating circuit for making a voltage difference between the first and the second input ports of the operational amplifier substantially equal to the offset voltage of the amplifier, compensating the bias currents of the operational amplifier. The compensating circuit may include a series of a first resistor and a second resistor connected between the first and the second input ports of the amplifier. The node connecting the first and the second resistors is coupled to a predetermined voltage, the resistances of the first and the second resistors being selected so that a voltage difference between the first and the second input ports of the amplifier is substantially equal to the offset voltage of the operational amplifier. A resistor may be connected between the first and the second input ports of the amplifier instead of the series of the first and the second resistors.

REFERENCES:
patent: 3617919 (1971-11-01), Clark
patent: 3906390 (1975-09-01), Rollett
patent: 3993959 (1976-11-01), Boctor
Ritter -- "Controlling the Op Amp with One Potentiometer", Electronics/Jul. 31, 1972; p. 78.

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