【正文】 I 本科畢業(yè)論文（設(shè)計） 題 目 ： 電子電路的噪聲研究 專 業(yè)： 姓 名 ： 學(xué) 號： 指導(dǎo)教師： 職 稱： 畢業(yè)時間： II 電子電路的噪聲研究 摘要 ：隨著電子技術(shù)的快速發(fā)展，各種各樣的電子設(shè)備或系統(tǒng)已經(jīng)開始廣泛的出現(xiàn)在人們的生活中。這些設(shè)備或系統(tǒng)在運行時會向周圍發(fā)射電磁能量，對其他的電 子設(shè)備產(chǎn)生干擾，嚴重時可以造成一定的傷害。本研究重點對電子噪聲的來源及其抑制方法進行討論。由電子噪聲的基礎(chǔ)知識，電子器件的內(nèi)部噪聲，電子電路的噪聲計算入手，討論電子電路中的噪聲來源及抑制噪聲的有效方法。 關(guān)鍵詞 ：內(nèi)部噪聲，來源，抑制 III The Study of electronic circuit noise Abstract: with the rapid development of electronic technology, all kinds of electronic equipment, or system has begun to widely appeared in people39。s lives. Around the equipment, or system at run time to launch the electromagic energy, produces interference to other electronic equipment, serious when can cause certain harm. This study focus on electronic noise sources and its suppression methods are discussed. By the basic knowledge of electronic noise, electronic devices, the internal noise of electronic circuit, the noise calculation of electronic noise sources in the circuit are discussed and the effective method to suppress noise. Keywords: internal noise sources, suppressed IV 目錄 .........................................................................................................................................1 ................................................................................................................1 ................................................................................................................1 電阻熱噪聲 ....................................................................................................................1 晶體管及其噪聲 .............................................................................................................3 低頻噪聲和電路板上電磁原件的干擾 .............................................................................5 4 噪聲的量度 ..............................................................................................................................6 信噪比 ............................................................................................................................6 噪聲系數(shù) .................................................................................................................7 噪聲溫度 .................................................................................................................7 分貝單位 .................................................................................................................7 5 噪聲干擾的路徑 .......................................................................................................................8 噪聲的耦合方式 .............................................................................................................8 公共阻抗耦合 .................................................................................................................8 直接耦合 ........................................................................................................................8 電容耦合 ........................................................................................................................9 電磁感應(yīng)耦合 .................................................................................................................9 漏電耦合 ...................................................................................................................... 10 輻射耦合 ...................................................................................................................... 10 6 電子產(chǎn)品噪聲的常規(guī)檢測方法 ................................................................................................ 11 7 噪聲干擾的克服方法 .............................................................................................................. 12 合理的選擇器件 ........................................................................................................... 12 采用優(yōu)質(zhì)的電源 ........................................................................................................... 13 對電路合理的布局 ...................................................