Differential amplifier with common mode rejection means

Details Differential amplifier with common mode rejection means Differential amplifier with common mode rejection means

1982-07-02

1984-12-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, H03F 345, H03F 126

Patent

active

044906862

ABSTRACT:
A differential amplifier suitable for use with a transducer network, such as a Wheatstone bridge, for measuring small signal voltages while eliminating common mode voltage contributions applied to the input of the amplifier. A potentiometer is connected across the output terminals of a pair of amplifiers whose positive input terminals receive the common mode voltage components and induced signal voltages from the transducer network. The shiftable terminal of the potentiometer is connected to the negative input terminals of one of the two amplifiers and adjusted to control the gain of the amplifier pair. The output signals of the differential amplifier are proportional to the induced signal voltages and devoid of the common mode voltage.

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