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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="2ytp1r1" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>廣東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>天津工控PCB設(shè)計(jì)供應(yīng),PCB設(shè)計(jì)</p><p><span>***更新：</span>2021-02-05 10:21:28</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="kvmxyea" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">東莞市仁遠(yuǎn)電子科技有限公司</a></p><p><span>聯(lián)系人：</span>陳海濤</p><p><span>郵箱: </span>haitao_chen@dgrenyuan.com</p><p><span>電話: </span>13802373717</p><p><span>傳真: </span>0769_</p><p><span>網(wǎng)址: </span>http://www.dgrenyuan.com</p><p><span>手機(jī): </span>0769-85626128</p><p><span>地址: </span>長安鎮(zhèn)烏沙社區(qū)環(huán)東路228號(hào)企匯服務(wù)中心五樓501</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="fuljbd5" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="frltzfw" class="box"><p><p>要是再加一個(gè)濾波器電磁線圈就能確保傳導(dǎo)干擾檢驗(yàn)通關(guān)。那麼什么叫電磁干擾呢？電磁干擾（ElectromagneticInterference-EMI）就是指電子器件設(shè)備或系統(tǒng)軟件傳出的雜散動(dòng)能或外界進(jìn)到該電子器件設(shè)備或系統(tǒng)軟件的雜散動(dòng)能，如在筆記本和檢測(cè)設(shè)備中間、復(fù)印機(jī)和臺(tái)式機(jī)中間及其蜂窩電話和醫(yī)療設(shè)備中間等都具備高頻率電磁干擾。電磁干擾包含傳導(dǎo)型(低頻)EMI、輻射型(高頻率)EMI、靜電感應(yīng)充放電(ESD)或雷擊造成的EMI。在人們進(jìn)到信息化管理社會(huì)發(fā)展，無線電波做為一種資源已在0Hz～400GHz寬屏范疇內(nèi)，普遍地用以信息科技商品中，如轎車、通訊、電子計(jì)算機(jī)、家用電器等商品，很多地涌人社會(huì)發(fā)展與家庭。伴之而成的電磁干擾也就從低頻到微波加熱**波段，防不勝防地輻射源或傳導(dǎo)至運(yùn)作中的子設(shè)備或系統(tǒng)軟件及其周邊的自然環(huán)境，天津工控PCB設(shè)計(jì)供應(yīng)，給設(shè)備或系統(tǒng)軟件乃至綠色生態(tài)產(chǎn)生了越來越嚴(yán)重的傷害。信息科技設(shè)備的電磁干擾不可忽視。電子計(jì)算機(jī)己朝高速運(yùn)行、高靈敏、高集成化和智能方位發(fā)展趨勢(shì)，系統(tǒng)軟件已經(jīng)是帶有多種多樣電子器件和很多子系統(tǒng)的底壓傳送信息內(nèi)容的繁雜設(shè)備。髙速和多層會(huì)使系統(tǒng)軟件的輻射源加劇，天津工控PCB設(shè)計(jì)供應(yīng)，底壓、高靈敏會(huì)使系統(tǒng)軟件的抗擾度減少，天津工控PCB設(shè)計(jì)供應(yīng)。因而。多年技術(shù)積累，專業(yè)PCB設(shè)計(jì)，為您提供量身定制電路板方案！天津工控PCB設(shè)計(jì)供應(yīng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="天津工控PCB設(shè)計(jì)供應(yīng),PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366420277314453/6315771.png"></div><p>合理進(jìn)行電路建模仿真是較常見的信號(hào)完整性解決方法，在高速電路設(shè)計(jì)中，仿真分析越來越顯示出優(yōu)越性。它給設(shè)計(jì)者以準(zhǔn)確、直觀的設(shè)計(jì)結(jié)果，便于及早發(fā)現(xiàn)問題，及時(shí)修改，從而縮短設(shè)計(jì)時(shí)間，降低設(shè)計(jì)成本。常用的有3種：SPICE模型，IBIS模型，Verilog-A模型。SPICE是一種功能強(qiáng)大的通用模擬電路仿真器。它由兩部分組成：模型方程式(ModelEquation)和模型參數(shù)(ModelParameters)。由于提供了模型方程式，因而可以把SPICE模型與仿真器的算法非常緊密地連接起來，可以獲得更好的分析效率和分析結(jié)果；IBIS模型是專門用于PCB板級(jí)和系統(tǒng)級(jí)的數(shù)字信號(hào)完整性分析的模型。它采用I/V和V/T表的形式來描述數(shù)字集成電路I/O單元和引腳的特性，IBIS模型的分析精度主要取決于1/V和V/T表的數(shù)據(jù)點(diǎn)數(shù)和數(shù)據(jù)的精確度，與SPICE模型相比，IBIS模型的計(jì)算量很小。天津工控PCB設(shè)計(jì)供應(yīng)多家名企都在找的廠家，PCB設(shè)計(jì)版圖專業(yè)提供各種線路板，快速出樣，價(jià)格優(yōu)惠！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="天津工控PCB設(shè)計(jì)供應(yīng),PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366419680332031/5364728.png"></div><p>因此應(yīng)盡量使信號(hào)同軸電纜的特性阻抗與負(fù)荷特性阻抗相同。另外也要留意PCB上的同軸電纜不可以出現(xiàn)突然變化或轉(zhuǎn)角，盡可能維持同軸電纜各點(diǎn)特性阻抗持續(xù)，不然在同軸電纜每段中間也可能出現(xiàn)反射面。這就規(guī)定在開展髙速PCB布線時(shí)，務(wù)必要遵循下列布線標(biāo)準(zhǔn)：（1）LVDS布線標(biāo)準(zhǔn)。規(guī)定LVDS信號(hào)差分信號(hào)走線，圖形界限4mil，線距6mil，目地是操縱HDMI的差分信號(hào)信號(hào)對(duì)特性阻抗為100+-15%歐母；（2）USB布線標(biāo)準(zhǔn)。規(guī)定USB信號(hào)差分信號(hào)走線，圖形界限10mil，線距6mil，地線和信號(hào)線距6mil；（3）HDMI布線標(biāo)準(zhǔn)。規(guī)定HDMI信號(hào)差分信號(hào)走線，圖形界限10mil，線距6mil，每2組HDMI差分信號(hào)信號(hào)對(duì)的間隔超出50mil；（4）DDR布線標(biāo)準(zhǔn)。DDR1走線規(guī)定信號(hào)盡可能不踏過孔，信號(hào)線等寬，線與線定距，走線務(wù)必考慮2W標(biāo)準(zhǔn)，以降低信號(hào)間的串?dāng)_，對(duì)DDR2及之上的髙速元器件，還規(guī)定高頻率數(shù)據(jù)信息走線等長，以確保信號(hào)的匹配電阻。維持信號(hào)傳送的一致性，避免因?yàn)榈鼐€切分造成的“地彈狀況”。大中小PCB設(shè)計(jì)銅泊薄厚。圖形界限和電流量的關(guān)聯(lián)。</p><p> 布線的幾何形狀、不正確的線端接、經(jīng)過連接器的傳輸及電源平面不連續(xù)等因素的變化均會(huì)導(dǎo)致此類反射。同步切換噪聲(SSN)當(dāng)PCB板上的眾多數(shù)字信號(hào)同步進(jìn)行切換時(shí)(如CPU的數(shù)據(jù)總線、地址總線等)，由于電源線和地線上存在阻抗，會(huì)產(chǎn)生同步切換噪聲，在地線上還會(huì)出現(xiàn)地平面反彈噪聲(地彈)。SSN和地彈的強(qiáng)度也取決于集成電路的I/O特性、PCB板電源層和平面層的阻抗以及高速器件在PCB板上的布局和布線方式。串?dāng)_(Crosstalk)串?dāng)_是兩條信號(hào)線之間的耦合，信號(hào)線之間的互感和互容引起線上的噪聲。容性耦合引發(fā)耦合電流，而感性耦合引發(fā)耦合電壓。串?dāng)_噪聲源于信號(hào)線之間、信號(hào)系統(tǒng)和電源分布系統(tǒng)之間、過孔之間的電磁耦合。串繞有可能引起假時(shí)鐘，間歇性數(shù)據(jù)錯(cuò)誤等，對(duì)鄰近信號(hào)的傳輸質(zhì)量造成影響。實(shí)際上，我們并不需要完全消除串繞，只要將其控制在系統(tǒng)所能承受的范圍之內(nèi)就達(dá)到目的。PCB板層的參數(shù)、信號(hào)線間距、驅(qū)動(dòng)端和接收端的電氣特性、基線端接方式對(duì)串?dāng)_都有一定的影響。過沖(Overshoot)和下沖(Undershoot)過沖就是前列個(gè)峰值或谷值超過設(shè)定電壓，對(duì)于上升沿，是指比較高電壓，對(duì)于下降沿是指比較低電壓。下沖是指下一個(gè)谷值或峰值超過設(shè)定電壓。 </p> <p> <br /> 這里是專業(yè)是pcb設(shè)計(jì)版圖和生產(chǎn)的廠家！快速打樣，歡迎咨詢！</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="天津工控PCB設(shè)計(jì)供應(yīng),PCB設(shè)計(jì)" src="https://tyunfile.71360.com/UploadFile/dgrydzkj/637366419714423828/4756355.png"></div><p>必須先依據(jù)電源電路的經(jīng)營規(guī)模、線路板的規(guī)格和電磁兼容測(cè)試（EMC）的規(guī)定來明確所選用的線路板構(gòu)造，也就是決策選用4層，6層，還是更雙層數(shù)的線路板。接下去，大家來掌握下雙層PCB板的設(shè)計(jì)方案流程及常見問題。雙層PCB設(shè)計(jì)的流程雙層PCB線路板的設(shè)計(jì)流程與一般的PCB板的設(shè)計(jì)方案流程基本一致，不同點(diǎn)是必須開展正中間數(shù)據(jù)信號(hào)層的布線與內(nèi)電層的切分，綜合性看來，雙層PCB線路板的設(shè)計(jì)方案基礎(chǔ)分成下列兩步：1、線路板的整體規(guī)劃，主要是要整體規(guī)劃PCB板的物理學(xué)規(guī)格，元器件的封裝類型，元器件安裝方法，板層構(gòu)造，即單面板、兩層板和實(shí)木多層板。2、工作中基本參數(shù)，關(guān)鍵就是指辦公環(huán)境基本參數(shù)和工作中層基本參數(shù)。恰當(dāng)有效的設(shè)定PCB空氣質(zhì)量參數(shù)，能給線路板的設(shè)計(jì)方案產(chǎn)生巨大的便捷，提升工作效能。3、元器件合理布局與調(diào)節(jié)，當(dāng)項(xiàng)目前期準(zhǔn)好后，能夠?qū)⒒ヂ?lián)網(wǎng)表導(dǎo)到PCB內(nèi)，或是能夠在電路原理圖中立即根據(jù)升級(jí)PCB的方法導(dǎo)進(jìn)網(wǎng)絡(luò)表。元器件合理布局和調(diào)節(jié)是PCB設(shè)計(jì)中較為關(guān)鍵的工作中，立即危害到后邊的走線和內(nèi)電層的切分等實(shí)際操作。4、PCB線路板內(nèi)層的界定與設(shè)定，該實(shí)際操作關(guān)鍵是在手機(jī)軟件的層局部變量管理工具里設(shè)定實(shí)際的層構(gòu)造。PCB設(shè)計(jì)，線路板貼片不知道怎么選購？來這里輕松買！河南高速PCB設(shè)計(jì)廠</p><p style="text-indent:25px">多年技術(shù)經(jīng)驗(yàn)，專業(yè)提供PCB設(shè)計(jì)，生產(chǎn)pcb線路板，為您提供各種線路板方案！天津工控PCB設(shè)計(jì)供應(yīng)</p><p>走線間距離間隔必須是單一走線寬度的3倍或兩個(gè)走線間的距離間隔必須大于單一走線寬度的2倍)。更有效的做法是在導(dǎo)線間用地線隔離。(4)在相鄰的信號(hào)線間插入一根地線也可以有效減小容性串?dāng)_，這根地線需要每1/4波長就接入地層。(5)感性耦合較難壓制，要盡量降低回路數(shù)量，減小回路面積，信號(hào)回路避免共用同一段導(dǎo)線。(6)相鄰兩層的信號(hào)層走線應(yīng)垂直，盡量避免平行走線，減少層間的串?dāng)_。(7)表層只有一個(gè)參考層面，表層布線的耦合比中間層要強(qiáng)，因此，對(duì)串?dāng)_比較敏感的信號(hào)盡量布在內(nèi)層。(8)通過端接，使傳輸線的遠(yuǎn)端和近端、終端阻抗與傳輸線匹配，可較高減少串?dāng)_和反射干擾。反射分析當(dāng)信號(hào)在傳輸線上傳播時(shí)，只要遇到了阻抗變化，就會(huì)發(fā)生反射，解決反射問題的主要方法是進(jìn)行終端阻抗匹配。典型的傳輸線端接策略在高速數(shù)字系統(tǒng)中，傳輸線上阻抗不匹配會(huì)引起信號(hào)反射，減少和消除反射的方法是根據(jù)傳輸線的特性阻抗在其發(fā)送端或接收端進(jìn)行終端阻抗匹配，從而使源反射系數(shù)或負(fù)載反射系數(shù)為O。傳輸線的長度符合下列的條件應(yīng)使用端接技術(shù)：L>tr/2tpd。式中，L為傳輸線長；tr為源端信號(hào)上升時(shí)間；tpd為傳輸線上每單位長度的負(fù)載傳輸延遲。天津工控PCB設(shè)計(jì)供應(yīng)</p><p style="text-indent:25px">東莞市仁遠(yuǎn)電子科技有限公司致力于電子元器件，以科技創(chuàng)新實(shí)現(xiàn)***管理的追求。仁遠(yuǎn)電子科技深耕行業(yè)多年，始終以客戶的需求為向?qū)?，為客戶提?**的電子產(chǎn)品研發(fā)，PCB 設(shè)計(jì)，中小批量PCB生銷售，SMT代工代料。仁遠(yuǎn)電子科技不斷開拓創(chuàng)新，追求出色，以技術(shù)為先導(dǎo)，以產(chǎn)品為平臺(tái)，以應(yīng)用為重點(diǎn)，以服務(wù)為保證，不斷為客戶創(chuàng)造更高價(jià)值，提供更優(yōu)服務(wù)。仁遠(yuǎn)電子科技始終關(guān)注自身，在風(fēng)云變化的時(shí)代，對(duì)自身的建設(shè)毫不懈怠，高度的專注與執(zhí)著使仁遠(yuǎn)電子科技在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3176158.html</p></div></div></div></div></div><div id="c9syz0o" class="page-right twoColRt"><div id="alrsi9d" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="so00w3x" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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