Development of a Miniaturized Testing System for Resonant Frequency Difference Detection for Delay Line Surface Acoustic Wave Devices

This letter presents a resonant frequency difference (RFD) readout system for a surface acoustic wave (SAW) device using the feedback/loop method. The proposed miniaturized testing system with a nice interactive interface which offers a reliable and accurate solution for real-time monitoring of RFD signals. The design details of the system, including the selection of components, circuitry, and signal processing techniques, are discussed. Compare with the theoretical analysis results of commercial vector network analyzer, the test results error of this system do not exceed 0.2%.