声表面波微压力传感器的信号调理电路设计

声表面波传感器因其独特的设计原理，具有体积小，无源无线，精度高等特点，在物理和生物领域应用广泛。针对声表面波输出频率信号采集复杂的问题，该文设计了一类信号调理电路，通过谐振选频电路稳定输出信号，并通过滤波、放大、整形将输出信号转变为方波信号，最终得到易于采集处理的频率信号。通过Multisim仿真证明，该电路有良好的信号调理能力，易集成。这为声表面波微压力传感器的信号采集和处理奠定了基础。

Design of Signal Conditioning Circuit for SAW Micro Pressure Sensor

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.