某型接收机中放大器自激机理分析与预防措施
电子技术应用
余小辉,麻泽龙
中国电子科技集团公司第十三研究所
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。
中图分类号:TN72 文献标志码:A DOI: 10.16157/j.issn.0258-7998.245673
中文引用格式: 余小辉,麻泽龙. 某型接收机中放大器自激机理分析与预防措施[J]. 电子技术应用,2024,50(11):54-58.
英文引用格式: Yu Xiaohui,Ma Zelong. Analysis of the mechanism and preventive measures of self-excited oscillation of amplifier in a receiver[J]. Application of Electronic Technique,2024,50(11):54-58.
中文引用格式: 余小辉,麻泽龙. 某型接收机中放大器自激机理分析与预防措施[J]. 电子技术应用,2024,50(11):54-58.
英文引用格式: Yu Xiaohui,Ma Zelong. Analysis of the mechanism and preventive measures of self-excited oscillation of amplifier in a receiver[J]. Application of Electronic Technique,2024,50(11):54-58.
Analysis of the mechanism and preventive measures of self-excited oscillation of amplifier in a receiver
Yu Xiaohui,Ma Zelong
The 13th Research Institute of China Electronics Technology Group Corporation
Abstract: The fault of higher level of IF-Noise was successfully handled for a receiver. The result shows that individual differences exist within the RF module cavity. It causes the self-excited oscillation of the local oscillator amplifier in pulsed mode. Preventive 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.
Key words : amplifier; mechanism of self-excited oscillation; wave-absorbing materials; preventive measures
引言
近年来,国内毫米波技术领域发展迅速。微波毫米波收发组件是雷达通信、卫星通信等系统中最为关键的组成部分,而放大器一般处于系统中的核心位置,其性能和稳定性对整个系统有着极为关键的影响[1-2]。放大器的稳定性是指其在环境(温度、信号频率、源、负载及腔体等)变化的情况下保持正常工作的能力。当放大器处于不稳定的工作状态下,即出现自激现象时,其产生的信号会干扰主信号的接收和发射,从而影响整个通信系统的性能[3-5]。本文结合某型接收机中频噪底升高的故障处理过程,包括故障确认过程、故障定位过程、故障处理方法以及最后的举一反三,对放大器的自激原理进行了深入的分析,并给出了有效避免放大器自激的措施。
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作者信息:
余小辉,麻泽龙
(中国电子科技集团公司第十三研究所, 河北 石家庄 050000)
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