Offset compensating circuit for operational amplifier

Details Offset compensating circuit for operational amplifier Offset compensating circuit for operational amplifier

1980-11-17

1982-10-26

Mullins, James B.

Amplifiers

With periodic switching input-output

330259, 330290, H03F 102, H03F 345

Patent

active

043564500

ABSTRACT:
Disclosed is an offset compensating circuit for an operational amplifier having its noninverting input terminal supplied with a compensating voltage corresponding to its output voltage obtained when its inverting input terminal is grounded. This offset compensating circuit includes a comparator connected to the output terminal of the operational amplifier and comparing the output voltage of the operational amplifier with a set voltage to deliver a binary signal corresponding to the result of such comparison, a pulse generator, an up-down counter for counting output pulses from the pulse generator in a count direction in accordance with the level of the output signal of the comparator, and a D/A converter for supplying the noninverting input terminal of the operational amplifier with a voltage corresponding to the count output of the up-down counter.

REFERENCES:
patent: 4229703 (1980-10-01), Bustin
Fullagar et al., Dual f.e.t.-input operational amplifier, Mar. 18, 1975, New Electronics.
D. Stout, Handbook of Operational Amplifier Circuit Design, pp. 2-3 to 2-5 (1976).

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