The surface acoustic wave (SAW) sensor is widely used in physics and biological fields because of its characteristics of unique design principles, small size, passive wireless, and high precision. Aiming at the complex problem of SAW output frequency signal acquisition, a kind of signal conditioning circuit is designed in this paper. The output signal is stabilized by the resonant frequency selection circuit, and is transformed into a square wave signal by filtering, amplifying and shaping. Finally, the frequency signal which is easy to be collected and processed is obtained. The Multisim simulation shows that this circuit has good signal conditioning ability and is easy to be integrated. This lays the foundation for signal acquisition and processing of SAW micro pressure sensor.
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邵勐,,李媛媛,,刘烨.声表面波微压力传感器的信号调理电路设计[J].压电与声光,2018,40(6):884-887. SHAO Meng,, LI Yuanyuan,, LIU Ye. Design of Signal Conditioning Circuit for SAW Micro Pressure Sensor[J]. PIEZOELECTRICS AND ACOUSTOOPTICS