一种简易FM信号频谱分析仪研究与设计  

作　　者：张学斌 张仁民 任壮宗 陈启承 

机构地区：[1]怀化学院电气与信息工程学院,湖南怀化418008

出　　处：《科技创新导报》2018年第32期89-91,93,共4页Science and Technology Innovation Herald

基　　金：武陵山片区生态农业智能控制湖南省重点实验室项目(项目编号:ZNKZ2015-2)

摘　　要：针对目前市面上无专门用于测试FM信号的频谱仪且商用频谱分析仪成本高体积大的现状,设计了一种测试FM调频信号的频谱分析仪。本频谱分析仪可用于测量88～108MHz范围内频率信号的幅频特性。系统由混频模块,本振源模块,控制模块,检波模块和显示模块等5个模块组成。混频模块将被测信号与本振信号进行混频得到中频信号,中频信号经过检波后送到控制模块进行AD采样,将采样数据存入单片机,并通过TFT屏显示。实验结果验证设计的有效性。In view of the fact that current market condition without special spectrum instrument which used to test the FM signal and In view of the defects that large volume and high cost of present commercial spectrum analyzer, a kind of test the FM radio signal spectrum analyzer is proposed. The spectrum analyzer can be used to measure 88MHz to 108MHz range frequency spectrum characteristics of the signal. System consists of mixing module, local oscillator module, control module, detection module and display module of f ive modules. The mixing module is used to mix the measured signals with the vibration signal to get the intermediate frequency signal, the intermediate frequency signal is sent to the control module for AD sampling after the detection, and the sampling data is stored in the microcontroller and displayed through the TFT screen.. The experimental results verify the validity of the design.

关 键 词：频谱分析仪 FM信号 混频 中频信号 

分 类 号：TN741[电子电信—电路与系统]