Low drift amplifier

Details Low drift amplifier Low drift amplifier

1981-09-08

1983-07-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 9, H03F 345, H03F 102

Patent

active

043921124

ABSTRACT:
A differential amplifier is arranged to exhibit substantially no D.C. offset or drift. Input signal is alternately connected to the non-inverting and inverting input terminals of an input differential stage. Synchronously therewith the differential output signals of the differential stage are interchanged to maintain the sense of the output signal constant. The synchronous interchanging of differential input and differential output signals tends to average out parameter offset in the input circuit elements. The differential input stage is provided with a substantially balanced active current mirror load. The current mirror load devices are commutated with respect to the input devices to further reduce amplifier offset arising inherently in the differential stage load elements. The commutation of the current mirror load elements is performed at a rate which is a multiple of the rate at which the input and output signals are interchanged.

REFERENCES:
patent: 3982172 (1976-09-01), Van de Plassche
patent: 4068182 (1978-01-01), Dingwall et al.
patent: 4138649 (1979-02-01), Schaffer
patent: 4185236 (1980-01-01), Van de Plassche
patent: 4225816 (1980-09-01), Schade, Jr.
patent: 4263519 (1981-04-01), Schade, Jr.
"A CMOS A/D Converter Circuit for Thermocouple Temp Measurement", 1981 IEEE International Solid State Circuits Conference, p. 60, Digest of Technical Papers.

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