減小電磁干擾的印刷電路板設(shè)計原則 內(nèi) 容 摘要……1 1 背景…1 1.1 射頻源.1 1.2 表面貼裝芯片和通孔元器件.1 1.3 靜態(tài)引腳活動引腳和輸入.1 1.4 基本回路……..2 1.4.1 回路和偶極子的對稱性3 1.5 差模和共?！?.3 2 電路板布局…4 2.1 電源和地…….4 2.1.1 感抗……4 2.1.2 兩層板和四層板4 2.1.3 單層板和二層板設(shè)計中的微處理器地.4 2.1.4 信號返回地……5 2.1.5 模擬數(shù)字和高壓…….5 2.1.6 模擬電源引腳和模擬參考電壓.5 2.1.7 四層板中電源平面因該怎么做和不應(yīng)該怎么做…….5 2.2 兩層板中的電源分配.6 2.2.1 單點和多點分配.6 2.2.2 星型分配6 2.2.3 格柵化地.7 2.2.4 旁路和鐵氧體磁珠……9 2.2.5 使噪聲靠近磁珠……..10 2.3 電路板分區(qū)…11 2.4 信號線……...12 2.4.1 容性和感性串?dāng)_……...12 2.4.2 天線因素和長度規(guī)則...12 2.4.3 串聯(lián)終端傳輸線…..13 2.4.4 輸入阻抗匹配...13 2.5 電纜和接插件……...13 2.5.1 差模和共模噪聲……...14 2.5.2 串?dāng)_模型……..14 2.5.3 返回線路數(shù)目..14 2.5.4 對板外信號I/O的建議14 2.5.5 隔離噪聲和靜電放電ESD .14 2.6 其他布局問題……...14 2.6.1 汽車和用戶應(yīng)用帶鍵盤和顯示器的前端面板印刷電路板...15 2.6.2 易感性布局…...15 3 屏蔽..16 3.1 工作原理…...16 3.2 屏蔽接地…...16 3.3 電纜和屏蔽旁路………………..16 4 總結(jié)…………………………………………17 5 參考文獻………………………17
上傳時間： 2013-10-22
上傳用戶：a6697238
ADOM+設(shè)計篇意在測試com+的事務(wù)處理能否正確執(zhí)行。 將組件安裝后，在組件服務(wù)中該com+組件的屬性設(shè)置中將“激活”頁的“啟用對象池”選項選中，執(zhí)行客戶端程序調(diào)用上面這個方法，發(fā)現(xiàn)com+的事務(wù)機制不能正確執(zhí)行，數(shù)據(jù)會寫入數(shù)據(jù)庫中。如果不選中“啟用對象池”，則一切正常，數(shù)據(jù)并不會寫到數(shù)據(jù)庫中。 說明：Translation DataModule的設(shè)置，事務(wù)屬性：requires a transaction,允許object pooling，pooled設(shè)為true,無論將AutoComplete設(shè)為True或False都會出現(xiàn)上述情況。 該問題最先由ytwxw (wxw) 提出，至今尚未有結(jié)論，我也發(fā)現(xiàn)類似問題。我倆探討后無法解決，特在此再開一貼。請各路com+高手幫忙解答!
上傳時間： 2015-07-20
上傳用戶：520
JavaServer Pages Software and OODB This tutorial covers Deploying Dynamic Sites Using Page Compilation, JavaServer PagesTM Software and an Object Oriented Database
標簽： JavaServer Deploying Software tutorial
上傳時間： 2016-03-11
上傳用戶：13215175592
The paper describes the concept and realization of the DOOCS control software for FPGAbased TESLA cavity controller and simulator (SIMCON). It bases on universal software components, created for laboratory purposes and used in MATLAB based control environment. These modules have been recently adapted to the DOOCS environment to ensure a unified software to hardware communication model. The presented solution can be also used as a general platform for control algorithms development. The proposed interfaces between MATLAB and DOOCS modules allow to check the developed algorithm in the operation environment before implementation in the FPGA. As the examples two systems have been presented.
標簽： realization FPGAbased describes the
上傳時間： 2017-04-16
上傳用戶：koulian
Two scripts are included here. 1. convsys.m - combines the state space representation of two systems connected in series. [Ao,Bo,Co,Do]=convsys(A1,B1,C1,D1,A2,B2,C2,D2) This algorithm gives the convolution of two state space representations | A1 B1 | | A2 B2 | u ==> | | ==> | | ==> y | C1 D1 | | C2 D2 | The algorithm also accepts state space objects as inputs and gives out a state space object as output. 2. sysfeedbk.m [Ao,Bo,Co,Do]=convsys(A1,B1,C1,D1,A2,B2,C2,D2) Gives the closed loop state space representation for two systems connected with negative feedback in the following manner. | A1 B1 | u ==> | | ==> y + o | C1 D1 | | - | | | | A2 B2 | | |= | |= | | C2 D2 | The zip file also contains checkcompatibility.m , which checks the compatibility of matrix dimensions in the system and cleanss.m which can be used to clean a state space representation.
標簽： representation included combines scripts
上傳時間： 2017-07-25
上傳用戶：semi1981
獲取計算機IP地址等網(wǎng)絡(luò)參數(shù) UDP聊天程序 TCP聊天程序 瀏覽器的實現(xiàn)
標簽： 獲取計算機的名稱和IP地址 基本C/S模式的通信實驗
上傳時間： 2015-04-12
上傳用戶：scnbyh
NFS服務(wù)器實現(xiàn)文件共享
上傳時間： 2015-05-13
上傳用戶：yangkang1192
Use the fast Fourier transform function fft to analyse following signal. Plot the original signal, and the magnitude of its spectrum linearly and logarithmically. Apply Hamming window to reduce the leakage. . The hamming window can be coded in Matlab as for n=1:N hamming(n)=0.54+0.46*cos((2*n-N+1)*pi/N); end; where N is the data length in the FFT.
標簽： matlab fft
上傳時間： 2015-11-23
上傳用戶：石灰?guī)r123
Use fft to analyse signal by plotting the original signal and its spectrum.
標簽： matlab fft
上傳時間： 2015-11-23
上傳用戶：石灰?guī)r123
一、地址映射與數(shù)據(jù)傳輸 二、PCI9054的基本知識 三、PCI9054的寄存器之間的關(guān)系
上傳時間： 2016-02-15
上傳用戶：4722656
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