基于高精度射频信号的调频广播研究  

FM Broadcast Based on High Precision Radio Frequency Signals

作　　者：范宁洁 

机构地区：[1]陕西交通职业技术学院,西安710018

出　　处：《计算机与数字工程》2016年第11期2266-2270,共5页Computer & Digital Engineering

基　　金：国家自然科学基金资助项目(编号:4053021)资助

摘　　要：针对调频广播在信号输出过程中易发生频谱被干扰的问题,运用直接数字频率合成设计了一种高精度射频信号源,采用了数字频率合成、外部场效应管和巴特沃斯滤波器分别设计了调频广播的控制模块、倍频模块和滤波模块。进行测试分析结果表明:信号源系统输出频带宽度可以达到370MHz,对电压最大幅值干扰抑制效果可以达到50dBc;当数字频率合成输出增益信号进行平滑处理后的频段最小频率100MHz时,外部噪声干扰和谐波信号干扰抑制为35dB,该调频广播信号源的频率稳定度和精度都比较高。For FM radio spectrum has problems of interference-prone in signal output process,direct digital frequency synthesizer is used to design a high precision RF signal source,a digital frequency synthesizer,external FET and Butterworth filters are used to design FM radio control modules,multiplier module and filter module.Test results show that the source system output bandwidth is up to 370 MHz,the maximum amplitude of the voltage interference suppression effect can be achieved 50 dBc,when the minimum frequency 100 MHz band digital frequency synthesizer output signal gain after smoothing,external noise and interference harmonic signal interference suppression is 35 dB,frequency stability and accuracy of the FM radio signal source are high.

关 键 词：调频广播 高精度射频 相位累加器 直接数字频率合成 信息增益 

分 类 号：TN934.82[电子电信—信号与信息处理]