Offset-voltage-balancing operational amplifier

Details Offset-voltage-balancing operational amplifier Offset-voltage-balancing operational amplifier

1990-09-14

1991-09-10

Laroche, Eugene R.

Amplifiers

With periodic switching input-output

330261, 330 51, 307353, 307491, 307494, H03F 102, H03F 316

Patent

active

050477277

ABSTRACT:
An offset-voltage-balancing operation amplifier for difference signals includes an auxiliary and a main amplifier, each having a difference input and an auto-zero input. To provide offset balancing, the auto-zero inputs are connected to the potentials of two integrated storage capacitors. The difference input of the auxiliary amplifier can be short-circuited via first and second switching means, and the two storage capacitors are connected to the output of the auxiliary amplifier via third and fourth switching means. The sensitivity of the auto-zero inputs is less than the sensitivity of the difference inputs.

REFERENCES:
patent: 4365204 (1982-12-01), Haque
patent: 4829263 (1989-05-01), Gulczynski
patent: 4833345 (1989-05-01), Miller
T. A. Schwarz, "Offset Compensation Circuit," IBM Technical Disclosure Bulletin, vol. 19, No. 9, Feb. 1977, pp. 3584-3585.
Michael Armstrong et al., "A CMOS Programmable Self-Calibrating 13b Eight Channel Analog Interface Processor," I.E.E.E. 1987 Solid-State Circuits Conference, Feb. 25, 1987, pp. 44-45, 333-334.
Brian Dance, "Chopper Stabilised Operational Amplifiers," New Electronics, vol. 20, No. 11, May 26, 1987, pp. 33-35.
Carl Jones et al., "Chopperstabilisierte Operationsverstarker--den Offset im Griff," Elektronik, vol. 20, Sep. 30, 1988, pp. 97-104.
European Search Report, dated May 31, 1990, for European Patent Application No. 89117361.9.

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