摘要：本文研究了開(kāi)關(guān)電源中MOSFET漏源極電壓電磁干擾的頻譜特性，通過(guò)提取MOSFET漏源極時(shí)域電壓信號(hào)的特征參數(shù)，對(duì)其波形進(jìn)行了仿真，分析了該信號(hào)電磁干擾的頻譜特點(diǎn)，并分別研究了信號(hào)中各參數(shù)對(duì)頻譜的影響，Matlab仿真表明該研究結(jié)果對(duì)解決電磁干擾問(wèn)題具有很好的參考和利用價(jià)值。 敘詞：電磁干擾，干擾源，Matlab Abstract：This paper studies the spectrum characteristics of MOSFET Drain-Source voltage of switch power supply. Simulate the waveform of the voltage through extracting the characteristic parameters of the time-domain voltage signal for MOSFET drain-source. Analysis the spectrum characteristics for EMI of the signal and separately researches the effect to spectrum of the parameters in the voltage signal. Matlab simulating shows that research results are very referable and useful to solve the EMI problems. Keyword：EMI, Source, Matlab