As shown in Figure 3, this circuit uses a BP01 pressure sensor and an op amp MAX4472. The BP01 pressure sensor is specially designed for detecting blood pressure and is mainly used in portable electronic blood pressure monitors. It adopts precision thick film ceramic chip and nylon plastic package, which has the characteristics of high linearity, low noise and low external stress; it adopts internal calibration and temperature compensation to improve the measurement accuracy, stability and repeatability, within the full range, The accuracy is ± 1%, and the zero offset is not more than ± 300μV. MAX4472 is a low power amplifier chip integrated with four operational amplifiers by MAXIM. In this system, the internal integrated operational amplifier A is connected to a constant current source to provide a constant current for the pressure sensor, operational amplifier B and operational amplifier C, and operational amplifier D form a differential input, single-ended output amplifier circuit, and directly input ADC0 to monitor the blood pressure DC component.
Figure 3 Blood pressure sensor circuit
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