嵌入式阻抗分析仪设计  

Design of an Embedded Impedance Analyzer

作　　者：张楠 马延军[2] ZHANG Nan;MA Yanjun(Shaanxi radio and TV station,Xi’an 710061,China;College of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]陕西广播电视台,西安710061 [2]西安科技大学通信与信息工程学院,西安710054

出　　处：《电子器件》2019年第5期1340-1343,共4页Chinese Journal of Electron Devices

基　　金：2018年碑林区应用技术研发项目(GX1815)

摘　　要：为了准确快捷地测试高频器件的特性,基于PIC18F452单片机设计了一款嵌入式阻抗分析仪。该分析仪利用AD9851芯片作为信号发生器,利用AD8302芯片作为幅度及相位检测器。PIC18F452单片机完成信号采集、控制及显示等。进一步,为了测试器件阻抗,绕制了高频定向耦合器。利用该分析仪测试了晶体滤波器输入阻抗,测试了高频功率放大器输入匹配单元,测试了短波天线阻抗。测试结果直观可靠,可广泛应用到广播电视系统中。In order to measure the characteristics of high frequency components,an embedded impedance analyzer is designed based on PIC18F452 micro-processor,where AD9851 is utilized as a signal generator,AD8302 is adopted as a magnitude and phase detector,and PIC18F452 is used to do signal acquisition and processing.Furthermore,a directional coupler is designed to measure the input impendence.Crystal filter power amplifier and short-wave antenna are fabricated and measured.The results are intuitive,and this analyzer can be used widely in broadcasting systems.

关 键 词：阻抗分析仪 阻抗测量 相位检测器 AD9851 AD8302 PIC18F452 

分 类 号：TM934.7[电气工程—电力电子与电力传动]