某型接收机中放大器自激机理分析与预防措施  

Analysis of the mechanism and preventive measures of self-excited oscillation of amplifier in a receiver

作　　者：余小辉[1] 麻泽龙 Yu Xiaohui;Ma Zelong(The 13th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050000,China)

机构地区：[1]中国电子科技集团公司第十三研究所,河北石家庄050000

出　　处：《电子技术应用》2024年第11期54-58,共5页Application of Electronic Technique

摘　　要：对某型接收机中频噪底升高故障进行了分析处理,分析结果表明射频模块腔体内存在个体差异,导致本振放大器在脉冲工作条件下产生自激,通过对放大器自激机理的分析给出了相应的预防措施,在射频小盒侧壁中粘贴吸波材料,可以有效消除自激。论文对今后腔体自激问题的处理分析具有参考价值。The fault of higher level of IF-Noise was successfully handled for a receiver.The result shows that individual differ‐ences exist within the RF module cavity.It causes the self-excited oscillation of the local oscillator amplifier in pulsed mode.Pre‐ventive measures are given after analysis of the mechanism.Attach wave-absorbing materials to the sidewalls of the RF box can effectively eliminate self-excited oscillation.This article has value for the analysis and treatment of cavity self-excited oscillation in the future.

关 键 词：放大器 自激机理 吸波材料 预防措施 

分 类 号：TN72[电子电信—电路与系统]