武汉理工大学学报(信息与管理工程版)
武漢理工大學學報(信息與管理工程版)
무한리공대학학보(신식여관리공정판)
JOURNAL OF WUHAN AUTOMOTIVE POLYTECHNIC UNIVERSITY
2015年
1期
8-11
,共4页
陈永泰%黄杨%黎琴%孙长景%程龙%臧滨%唐静
陳永泰%黃楊%黎琴%孫長景%程龍%臧濱%唐靜
진영태%황양%려금%손장경%정룡%장빈%당정
中频抑制比%镜频抑制比%逆切比雪夫陷波滤波%巴特沃斯低通滤波
中頻抑製比%鏡頻抑製比%逆切比雪伕陷波濾波%巴特沃斯低通濾波
중빈억제비%경빈억제비%역절비설부함파려파%파특옥사저통려파
IF rejection ratio%image frequency rejection ratio%reverse Chebyshev notch filter%Butterworth low-pass filtering
针对镜频和中频干扰对接收机性能影响的问题,分析了其原因并给出解决方案,设计了跟踪选频滤波器、逆切比雪夫陷波滤波器、5阶巴特沃斯低通滤波器,以及低噪声放大器的三级滤波方式所组成的短波接收机前端滤波放大电路,使短波接收机的中频、镜频抑制比均大于90 dB,接收机的性能得到较大提高。
針對鏡頻和中頻榦擾對接收機性能影響的問題,分析瞭其原因併給齣解決方案,設計瞭跟蹤選頻濾波器、逆切比雪伕陷波濾波器、5階巴特沃斯低通濾波器,以及低譟聲放大器的三級濾波方式所組成的短波接收機前耑濾波放大電路,使短波接收機的中頻、鏡頻抑製比均大于90 dB,接收機的性能得到較大提高。
침대경빈화중빈간우대접수궤성능영향적문제,분석료기원인병급출해결방안,설계료근종선빈려파기、역절비설부함파려파기、5계파특옥사저통려파기,이급저조성방대기적삼급려파방식소조성적단파접수궤전단려파방대전로,사단파접수궤적중빈、경빈억제비균대우90 dB,접수궤적성능득도교대제고。
The impact of IF ( intermediate frequency ) and image frequency interference on the receiver was discussed .Then the causes were analyzed and the solutions were given .The LNA ( low noise amplifier ) was designed .Three filtering methods were proposed for the shortwave receiver front -end filter amplifier circuit with tracking frequency selective filter , reverse Cheby-shev notch filter, and 5-order Butterworth low -pass filter.The IF and image frequency rejection ratio of shortwave receiver were both realized to be greater than 90 dB.