Amplifier with offset correction

Details Amplifier with offset correction Amplifier with offset correction

1994-12-20

1996-04-16

Mullins, James B.

Amplifiers

With periodic switching input-output

330259, 330290, 360 67, H03F 345

Patent

active

055086560

ABSTRACT:
A signal processing circuit that includes a differential amplifier and an integrator. The differential amplifier receives at a first input a signal to process and at a second input an offset compensation signal provided by the integrator. The integrator includes a differential transconductance amplifier receiving an output voltage of the signal processing circuit at a first input and a reference voltage at a second input; a capacitor having a first terminal connected to the output of the transconductance amplifier and a second terminal connected to a fixed voltage; and a voltage follower receiving the voltage at the first terminal of the capacitor and providing the offset compensation signal.

REFERENCES:
patent: 3366889 (1968-01-01), Avins
patent: 3580243 (1971-05-01), Johnson
patent: 3737798 (1973-06-01), Faraguet et al.
patent: 4039963 (1977-08-01), Guillon et al.
patent: 4430622 (1984-02-01), Simoes
patent: 4622521 (1986-11-01), Redfern
Review of Scientific Instruments, vol. 59, No. 7, Jul. 1988, New York US, pp. 1241-1243, R. C. S. Freire et al., "DC Amplifier with Auto-Zeroing of Thermal Drift".

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