Differential amplifier with common mode rejection means
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United States of America Patent
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Dec 25, 1984
Grant Date -
N/A
app pub date -
Jul 2, 1982
filing date -
Jul 2, 1982
priority date (Note) -
Expired
status (Latency Note)
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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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