Modified bridge circuit for measurement purposes
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United States of America Patent
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-
Jul 9, 1985
Grant Date -
N/A
app pub date -
Oct 7, 1982
filing date -
Oct 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a four element modified bridge circuit for measurement purposes at least one impedance element is variable according to a magnitude to be measured. Via a first operational amplifier a DC supply voltage is connected across two bridge nodes facing each other, and at the other two nodes facing each other an output signal is delivered corresponding to the magnitude to be measured. By means of a second operational amplifier one of the output nodes is virtually drawn to ground so that the signal at the second output bridge node is referenced to ground. Thus, the signal at the second output node corresponds to the desired measured magnitude without a superimposed power supply voltage and may be amplified by a third standard operational amplifier without the need of a differential amplifier circuit.
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