Operational amplifier with improved offset correction

Details Operational amplifier with improved offset correction Operational amplifier with improved offset correction

1980-05-19

1982-03-30

Mullins, James B.

Amplifiers

With periodic switching input-output

330259, 330290, H03F 134

Patent

active

043226876

ABSTRACT:
Improved input offset voltage compensation of an amplifier (12) is achieved through the use of a servo loop which is added to electronic switch and capacitor offset compensation circuitry disposed in the input (14) and feedback (20) paths of the amplifier. A voltage approximately equal to the offset voltage is stored on a feedback capacitor (24) by operation of input reset (34), feedback shunt (22) and feedback reset (26) switches. An error correction voltage is then generated within the servo loop (40) to adjust for the residual offset produced by the operation of the input reset and feedback shunt switches as well as the finite gain of the amplifier.

REFERENCES:
patent: 3617913 (1971-11-01), Schmidhauser et al.
patent: 3737798 (1973-06-01), Faraquet et al.
patent: 4129863 (1978-12-01), Gray et al.
Suarez et al. "An All-MOS Charge-Redistribution A/D Conversion Technique" pp. 194-195 IEEE International Solid State Circuit Conference 1974.

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