Fully differential switched capacitor amplifier having autozeroe

Details Fully differential switched capacitor amplifier having autozeroe Fully differential switched capacitor amplifier having autozeroe

1986-04-11

1987-09-29

Mullins, James B.

Amplifiers

With periodic switching input-output

330107, 330253, 330258, 330260, H03F 345, H03F 134

Patent

active

046971521

ABSTRACT:
A fully differential amplifier which is compensated for both input offset voltage error and output common-mode variation is provided. The differential amplifier provides two very accurate output reference voltages which vary in proportion to the difference between first and second input voltages. In one form, the differential amplifier functions as an integrator. A differential amplifier is provided which uses first and second input pairs of differential transistors for normal differential operation and for common-mode output voltage regulation, respectively. Both input pairs of transistors must be compensated for offset voltage associated therewith. A compensation portion external to the differential amplifier is used to compensate for an offset voltage associated with circuitry within the differential amplifier for regulating the common-mode output voltage.

REFERENCES:
patent: 4574250 (1986-03-01), Senderowicz

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