声表面波标签的FSCW频域阅读器设计  

Design of FSCW Frequency Domain Reader for SAW Tag

作　　者：陈智 陈智军[1] 韩宇 朱卫俊[2] 王春涛 CHEN Zhi;CHEN Zhijun;HAN Yu;ZHU Weijun;WANG Chuntao(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;CETC Deqing Huaying Electronics Co.,Ltd,Deqing 313200,China)

机构地区：[1]南京航空航天大学自动化学院,江苏南京211106 [2]中电科技德清华莹电子有限公司,浙江德清313200

出　　处：《压电与声光》2022年第6期831-836,共6页Piezoelectrics & Acoustooptics

基　　金：江苏省重点研发计划社会发展项目(BE2022844);南京航空航天大学研究生科研与实践创新计划基金资助项目(xcxjh20210305)。

摘　　要：基于频率步进连续波(FSCW)的声表面波频域阅读器采用类似矢量网络分析仪(VNA)测量频域响应的原理,对声表面波标签回波信息进行解算。首先对基于FSCW的频域采样原理进行理论推导,指导阅读器参数的设计;再将直接数字频率合成器(DDS)与内置锁相环(PLL)的IQ调制器相结合设计了可快速变频的发射链路,接收链路采用双向耦合器与硬件IQ解调芯片完成正交相干混频,实现了绝对相位的稳定测量;最后实际制作了阅读器电路板,并结合声表面波标签对阅读器性能进行测试,通过与网络分析仪测量结果对比,结果表明该文设计的阅读器有效。The surface acoustic wave(SAW) frequency domain reader based on the frequency step continuous wave(FSCW) uses the principle similar to that of vector network analyzer(VNA) for measuring the frequency domain response to resolve the echo information of the SAW tag. Firstly, the theoretical derivation of frequency domain sampling principle based on FSCW is carried out to guide the design of the reader’s parameters. Then, by combining the direct digital synthesizer(DDS) and the IQ modulator with the built-in phase locked loop(PLL), a fast frequency-converting transmit chain is designed, and a bidirectional coupler and a hardware IQ demodulation chip are used in the receive chain to realize quadrature coherent mixing, which realizes the stable measurement of the absolute phase. Finally, the circuit board of the reader is actually made, and the performance of the reader is tested with the SAW tag. By comparing with the measured results of the VNA, it is showed that the reader designed in this paper is effective.

关 键 词：声表面波 频率步进连续波 频域采样 矢量网络分析仪 IQ调制 

分 类 号：TN743[电子电信—电路与系统]