现代电子技术Issue(21)：73-75,3.
数字频率特性测试仪的设计
Design of digital frequency characteristic analyzer
摘要
Abstract
In view of the shortcomings of the traditional analog frequency characteristic tester,a simple frequency characteris-tic tester was designed by means of digital technology,and in combination with the advanced DDS,MSP430 microcontroller and some common peripheral analog circuits. The input signal and output response of the circuit under test are sampled by the sys-tem. The amplitude frequency and phase frequency characteristics of the circuit are obtained by digital signal processing. The de-signed tester was used to test A RLC network. The test results indicate that the system′s relative error of the center frequency is less than 0.2%,relative error of the loaded quality factor is less than 1.25%,maximum voltage gain is larger than -1 dB,input and output impedances are all 50 Ω,amplitude error absolute value is less than 0.5 dB,and phase frequency error absolute value is less than 3°. Tester can meet the testing requirements of general parameters.关键词
幅频特性测试/直接数字式频率合成器/串联谐振/扫频Key words
amplitude frequency characteristic test/direct digital synthesizer/series resonance/sweep frequency分类
信息技术与安全科学引用本文复制引用
孙冬娇,王文兵,丁俊..数字频率特性测试仪的设计[J].现代电子技术,2014,(21):73-75,3.基金项目
国家自然科学基金项目（61307061，41275042）；江苏省自然科学基金（BK20131001）；江苏省高校自然科学研究基金（13KJB510017）；南京信息工程大学本科生优秀毕业论文支持计划项目资助 （）
