【正文】 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(cè)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(duì)電路合理的布局 ....................................................................................................... 14 抑制和減少輸入端偏置電路的噪聲 ................................................................................ 14 通過對(duì)路徑的控制來(lái)克服噪聲干擾 ............................................................................... 15 選擇合理的接地點(diǎn) .............................................................................................. 15 加入校正電路 ..................................................................................................... 16 根據(jù)不同的工作頻段、參數(shù)選擇適當(dāng)?shù)姆糯箅娐?: ................................................ 16 合理選取級(jí)間藕合也可以抑制噪聲 ...................................................................... 17 通過 處理接收方來(lái)減小噪聲干擾 .......................................................