短波接收机DDS本振源的优化设计  

Optimized Design of Local Oscillator Based on DDS of Short-wave Receiver

作　　者：黎琴 唐静[2] 李斌 孙长景[2] 陈衍 张静[2] 方勇[2] 

机构地区：[1]常州国光数据通信有限公司,江苏常州213000 [2]武汉理工大学信息工程学院,湖北武汉430070

出　　处：《武汉理工大学学报（信息与管理工程版）》2014年第4期452-455,464,共5页Journal of Wuhan University of Technology：Information & Management Engineering

基　　金：国家自然科学基金资助项目(11274352)

摘　　要：讨论了本振源的相位噪声和寄生输出对接收机性能的影响,给出了一种短波接收机DDS本振源的优化设计方案,其中,外倍频电路提高了本振源的频谱纯度,亚倍频程带通滤波器抑制了输出信号的杂散分量。测试结果表明,短波接收机的倒易混频及灵敏度指标得到了改善。该本振源已在短波接收机中获得实际应用。The local oscillator is one of the core components in the superheterodyne receivers.The influence of phase noise and spurious signals on the receiver performance was discussed.Then an optimized scheme of the DDS local oscillator of short-wave receiver was given,of which the spectrum purity of the local source was improved by the external frequency multiplier;and the spurious signal of output was suppressed by the sub-octave band-pass filter.The test results show that the performance of short-wave receiver reciprocal mixing and sensitivity indicator has been improved.

关 键 词：本振源 相位噪声 杂散抑制 低噪声倍频 亚倍频程滤波 

分 类 号：TN924.1[电子电信—通信与信息系统]