声表面波射频识别系统的FMCW信号源设计  

Design of FMCW Signal Source for Surface Acoustic Wave Radio Frequency Identification System

作　　者：郭佳佳 陈智军[1] 蔡达轩 贾浩 徐海林[2] 李亚飞 GUO Jiajia;CHEN Zhijun;CAI Daxuan;JIA Hao;XU Hailin;LI Yafei(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Deqing Huaying Electronics Co.,China Electronics Technology Group Corporation,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》2020年第1期16-20,24,共6页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51475240);南京航空航天大学研究生创新基地(实验室)开放基金资助项目(kfjj20180301)

摘　　要：频率调制连续波(FMCW)的产生(即FMCW信号源)是声表面波射频识别系统频域采样阅读器的重要组成部分。为了满足扫频速度、带宽和线性度等要求,采用直接数字频率合成器(DDS)与锁相环(PLL)混频,并结合IQ调制的方式设计了超高频FMCW信号源。实际制作了信号源电路,DDS芯片输出I、Q两路正交信号,并分别以差分形式传输至IQ调制芯片进行上变频。测试了DDS输出信号的差分、正交特性,分别对信号源产生的单频信号和扫频信号进行了测试。最后搭建系统对声表面波标签进行测试。测试结果表明信号源设计的有效性。The generation of frequency modulated continuous wave,namely FMCW signal source,is an important part of the frequency domain sampling reader of the surface acoustic wave(SAW)radio frequency identification(RFID)system.To satisfy the requirements of frequency sweep speed,bandwidth and linearity,the ultra-high frequency(UHF)FMCW signal source is designed by the mixing of direct digital frequency synthesizer(DDS)and phase locked loop(PLL)and combining with IQ modulation.The signal source circuit is actually fabricated.The DDS chip outputs the dual-channel quadrature signals,I and Q,which are transmitted to IQ modulation chip in differential form for up-conversion respectively.The differential and orthogonal characteristics of the DDS output signals are tested;the single frequency signal and sweep frequency signal generated by signal source are tested respectively.Finally,a test system is built to measure the SAW tag,and the test results show the effectiveness of the design of the FMCW signal source.

关 键 词：声表面波 频域采样 直接数字频率合成器 锁相环 IQ调制 频率调制连续波 

分 类 号：TN743[电子电信—电路与系统]