基于扫频技术的乐甫波器件测试系统

摘要

The structure of Love wave device is introduced, the Love wave device is designed and implemented, and the design parameters are given. The measurement system based on the frequency scanning technology is set up, which includes the signal source, the signal acquisition module, the micro controller module, etc. The sine excitation signal is produced with a certain frequency interval in a certain frequency range by the DDS chip AD9912. The amplitude ratio of the input excitation signal to the output response signal at each frequency point in the frequency scanning range is acquired by AD8302, and the amplitude-frequency curve is characterized and the resonance frequency is obtained, accordingly. The measurement result of this system is in accordance with that of the network analyzer, and this system can realize the frequency scanning function of the network analyzer.%介绍了乐甫波器件的结构,设计制作了乐甫波器件,给出了乐甫器件的制作参数,搭建了基于扫频技术的测试系统,包括信号源模块、信号采集模块、微控制器模块等.通过DDS芯片AD9912在一定频率范围内,以一定频率间隔扫频输出高频正弦激励信号,利用AD8302芯片测量扫频范围内每一频率点的器件输入激励信号与输出响应信号幅值比,描绘出幅频特性曲线,并给出器件谐振频率.该测试系统的测量结果与网络分析仪基本一致,实现了网络分析仪的扫频功能.