简易频率特性测试仪的设计与实现  

Design and implementation of simple frequency characteristic analyzer

作　　者：张雅希 任超[1] Zhang Yaxi;Ren Chao(School of Information Engineering,Jiangxi Vocational College of Industry and Engineering,Pingxiang 337000,China)

机构地区：[1]江西工业工程职业技术学院信息工程学院

出　　处：《无线互联科技》2019年第21期61-62,共2页Wireless Internet Technology

摘　　要：文章以零中频正交解调为原理,设计实现了一个简易频率特性测试仪原型。测试仪主要由正交扫频信号源、零中频解调网络、模拟数字转换器、外部按键及液晶显示模块构成,无线链路控制串联谐振电路用作被测网络。正交信号源由DDS专用芯片以及单片机实现,零中频解调网络通过模拟乘法器、低通滤波器等构成的硬件电路实现。经测试,本设计能在1~40 MHz范围内准确完成对被测网络频率特性和相频特性的测试及显示。In this paper, a prototype of a simple frequency characteristic analyzer is designed based on the principle of zero-IF quadrature demodulation. The analyzer is mainly composed of an orthogonal frequency sweep signal generator, a zero-IF demodulation network, an analog to digital converter, some external buttons and a liquid crystal display module. Radio link control series resonant circuit is used as the network under test. Through the test, the design can accurately test arcl display the frequency and phase response curve of the measured network in the range of 1~40 MHz.

关 键 词：频率特性测试 零中频正交解调 模拟乘法器 

分 类 号：TN7[电子电信—电路与系统]