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。
中圖分類號:TN72 文獻(xiàn)標(biāo)志碼:A DOI: 10.16157/j.issn.0258-7998.245673
中文引用格式: 余小輝,麻澤龍. 某型接收機(jī)中放大器自激機(jī)理分析與預(yù)防措施[J]. 電子技術(shù)應(yīng)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: 余小輝,麻澤龍. 某型接收機(jī)中放大器自激機(jī)理分析與預(yù)防措施[J]. 電子技術(shù)應(yīng)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
近年來,國內(nèi)毫米波技術(shù)領(lǐng)域發(fā)展迅速。微波毫米波收發(fā)組件是雷達(dá)通信、衛(wèi)星通信等系統(tǒng)中最為關(guān)鍵的組成部分,而放大器一般處于系統(tǒng)中的核心位置,其性能和穩(wěn)定性對整個(gè)系統(tǒng)有著極為關(guān)鍵的影響[1-2]。放大器的穩(wěn)定性是指其在環(huán)境(溫度、信號頻率、源、負(fù)載及腔體等)變化的情況下保持正常工作的能力。當(dāng)放大器處于不穩(wěn)定的工作狀態(tài)下,即出現(xiàn)自激現(xiàn)象時(shí),其產(chǎn)生的信號會干擾主信號的接收和發(fā)射,從而影響整個(gè)通信系統(tǒng)的性能[3-5]。本文結(jié)合某型接收機(jī)中頻噪底升高的故障處理過程,包括故障確認(rèn)過程、故障定位過程、故障處理方法以及最后的舉一反三,對放大器的自激原理進(jìn)行了深入的分析,并給出了有效避免放大器自激的措施。
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作者信息:
余小輝,麻澤龍
(中國電子科技集團(tuán)公司第十三研究所, 河北 石家莊 050000)

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