Pressure measurement circuit diagram composed of OPO7

Published:2011/4/29 2:36:00 Author:Nicole | Keyword: Pressure measurement | From:SeekIC

The figure 1 is a pressure measurement circuit which is composed of OPO7. In the circuit, A2 uses Bi-FET input operational amplifier, when adjust potentiometer RP1, it can avoid the zero drift which is caused by bias current. A3 is initial balanced circuit and singal calibration circuit. The precision of amplifier is 0.5%, but the allowable bridge resistance precision is ±10%. In reality, it can be improved if take measures. The common-mode rejection ratio is about 90dB, 1kHz band noise is about 1~2μV(peak-peak value). It provides pressure sensor with constant current.



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