Common mode error correction for differential amplifiers

Details Common mode error correction for differential amplifiers Common mode error correction for differential amplifiers

1994-07-01

1995-06-13

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

330 69, 330258, 324123R, G01R 1900

Patent

active

054246776

ABSTRACT:
Common mode error correction for differential amplifiers involves accurately measuring both the input and output of an amplifier using a low-leakage measurement path, and calculating common-mode gain. Two measurements are made at each node by appying two different common-mode voltages. Subtracting one set of measurements from the other eliminates voltage offset errors, and leaves a common-mode error term for gain calculation. The common-mode gain factor is stored, and thereafter, common mode error may be subtracted from measurements made by the differential amplifier.

REFERENCES:
patent: 3581198 (1971-05-01), Shoemaker et al.

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