某型接收機中放大器自激機理分析與預防措施
電子技術應用
余小輝,麻澤龍
中國電子科技集團公司第十三研究所
摘要: 對某型接收機中頻噪底升高故障進行了分析處理,分析結果表明射頻模塊腔體內存在個體差異,導致本振放大器在脈沖工作條件下產生自激,通過對放大器自激機理的分析給出了相應的預防措施,在射頻小盒側壁中粘貼吸波材料,可以有效消除自激。論文對今后腔體自激問題的處理分析具有參考價值。
中圖分類號:TN72 文獻標志碼:A DOI: 10.16157/j.issn.0258-7998.245673
中文引用格式: 余小輝,麻澤龍. 某型接收機中放大器自激機理分析與預防措施[J]. 電子技術應用,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. 某型接收機中放大器自激機理分析與預防措施[J]. 電子技術應用,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,國內毫米波技術領域發展迅速。微波毫米波收發組件是雷達通信、衛星通信等系統中最為關鍵的組成部分,而放大器一般處于系統中的核心位置,其性能和穩定性對整個系統有著極為關鍵的影響[1-2]。放大器的穩定性是指其在環境(溫度、信號頻率、源、負載及腔體等)變化的情況下保持正常工作的能力。當放大器處于不穩定的工作狀態下,即出現自激現象時,其產生的信號會干擾主信號的接收和發射,從而影響整個通信系統的性能[3-5]。本文結合某型接收機中頻噪底升高的故障處理過程,包括故障確認過程、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
(中國電子科技集團公司第十三研究所, 河北 石家莊 050000)
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