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src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><div id="jthqnxy" class="pgc-img" style="box-sizing: border-box; margin: 0px 0px 18px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><img src="http://uphotos.eepw.com.cn/1658581631/pics/1675059709194509.png" title="1675059709194509.png" alt="image.png" /><p class="pgc-img-caption" style="box-sizing: border-box; margin-top: 20px; padding: 0px; border: 0px; margin-bottom: 0px !important;"><br /></p></div><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">當我們談?wù)撋漕l/高速PCB設計中的S參數、阻抗匹配、傳輸線(xiàn)和其他基本概念時(shí)，50歐姆阻抗的概念層出不窮。瀏覽互聯(lián)網(wǎng)上的信令標準、組件數據表、應用說(shuō)明和設計指南；這是一個(gè)反復出現的阻抗值。那么50歐姆阻抗標準從何而來(lái)，為什么它很重要？孤立地看，選擇50歐姆阻抗似乎完全是任意的：為什么不選擇10歐姆或100歐姆呢？</span></p><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">答案主要取決于你問(wèn)誰(shuí)。射頻社區，特別是電纜設計師，有最好的答案，他們對同軸電纜的分析支持了他們的解釋。除了一位專(zhuān)家的參考資料，我從來(lái)沒(méi)有看到過(guò)這種討論是關(guān)于PCB上發(fā)生的事情的，但是PCB的答案與常見(jiàn)邏輯電路的內部結構和電氣特性有關(guān)。如果你已經(jīng)準備好上歷史課了50歐姆的阻抗值，那就繼續讀吧。我們甚至會(huì )研究75歐姆的標準，看看我們能學(xué)到什么關(guān)于射頻互連的信號和功率傳輸。</span></p>同軸電纜和50歐姆阻抗的歷史<p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">50歐姆阻抗的歷史可以追溯到20世紀20年代末30年代初，當時(shí)電信業(yè)還處于初級階段。工程師們正在為設計輸出千瓦功率的無(wú)線(xiàn)電****機設計充氣同軸電纜。這些電纜也將跨越很長(cháng)的距離，達到數百英里。這意味著(zhù)電纜需要設計成最高功率傳輸、最高電壓和最低衰減。應該使用哪種阻抗來(lái)滿(mǎn)足這三個(gè)目標？</span></p><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">事實(shí)證明，這三個(gè)目標是不可能平衡的，就像在許多其他設計問(wèn)題中一樣。</span></p><ul style="box-sizing: border-box; margin: 20px 30px; padding: 0px; border: 0px; counter-reset: ul_list 0; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);" class=" list-paddingleft-2"><li><p><span style="box-sizing: border-box; font-weight: 700; margin: 0px; padding: 0px; border: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">最低損耗：</span></span><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">這取決于同軸電纜內部介質(zhì)的損耗。對于充氣同軸電纜，在大約77歐姆時(shí)會(huì )出現這種情況，對于某些介質(zhì)填充電纜，這種情況大約為50歐姆（更多信息請參見(jiàn)下文）。</span></p></li><li><p><span style="box-sizing: border-box; font-weight: 700; margin: 0px; padding: 0px; border: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">最高電壓：</span></span><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">這是基于中心導體和充氣同軸電纜側壁之間的電場(chǎng)。當導體的阻抗約為60歐姆時(shí)，TE10模式下的電場(chǎng)最大。</span></p></li><li><p><span style="box-sizing: border-box; font-weight: 700; margin: 0px; padding: 0px; border: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">最高功率傳輸：</span></span><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">任何尺寸的同軸電纜都可能足夠長(cháng)，可以像傳輸線(xiàn)一樣支持波的傳播。同軸電纜承載的功率受擊穿場(chǎng)和電纜阻抗的限制：V2/Z。結果表明，對于在TE11截止值以下工作的充氣同軸電纜，功率傳輸在大約30歐姆時(shí)最大。</span></p></li></ul><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">下圖顯示了損耗和功率之間的權衡。下面的文件由Wikimedia提供，但是您可以從許多其他參考資料中找到類(lèi)似的圖形。您也可以使用阻抗、銅粗糙度/集膚效應和介電吸收并為同軸電纜生成類(lèi)似的圖形。功率計算需要對基波傳播模式和特性阻抗進(jìn)行全解。</span></p><div id="me6kyvj" class="pgc-img" style="box-sizing: border-box; margin: 18px 0px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><img src="http://uphotos.eepw.com.cn/1658581631/pics/1675059723655503.png" title="1675059723655503.png" alt="image.png" /><p class="pgc-img-caption" style="box-sizing: border-box; margin-top: 20px; padding: 0px; border: 0px; margin-bottom: 0px !important;"><br /></p></div><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">關(guān)于上圖，需要了解的一點(diǎn)是，介質(zhì)色散通常不包括在內，并且在較高的頻率下會(huì )影響結果。在計算這些曲線(xiàn)時(shí)，色散（Dk值和損耗切線(xiàn)）被認為具有平坦的色散，這可能與您的頻率范圍內的實(shí)際情況不符。然而，這條曲線(xiàn)給了我們一個(gè)很好的解釋?zhuān)瑸槭裁磿?huì )把重點(diǎn)放在50歐姆阻抗上。</span></p>妥協(xié)還是絕緣？<p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">這個(gè)問(wèn)題的快速答案是50歐姆是最小損耗、最大功率和最大電壓對應的阻抗之間最小的折衷。事實(shí)上，50歐姆非常接近77到30歐姆之間的平均值，接近60歐姆，所以很自然地假設這就是50歐姆阻抗標準的原因。然而，人們可能會(huì )注意到，聚四氟乙烯填充同軸電纜的最小損耗阻抗只有大約50歐姆，所以這似乎是另一個(gè)自然的解釋?zhuān)?/span></p>75歐姆阻抗呢？<p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">事實(shí)證明，電壓值不那么重要；要么你擔心攜帶能量，盡量減少損失，要么試圖平衡兩者。帶有空氣或低Dk介質(zhì)填充物的低成本同軸電纜可以在長(cháng)距離電纜中達到77歐姆的阻抗，但是為什么要舍入到75歐姆而不是使用77歐姆，對我來(lái)說(shuō)仍然是個(gè)謎。人們會(huì )認為75歐姆是一個(gè)很好的四舍五入的數字，很容易記住，而一篇關(guān)于微波爐101的外部文章聲稱(chēng)這是有意設計的。在鋼芯同軸電纜中，直徑稍微過(guò)大，以提供額外的靈活性，因此阻抗將達到75歐姆。不管這是不是真的，我不能證實(shí)，但我歡迎任何人請在LinkedIn上聯(lián)系我并給出答案 !</span></p>參考阻抗變換<p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">在處理高速或高頻信道時(shí)，我們通常使用S參數測量作為重要的信號完整性度量。這些是根據一些參考阻抗定義的，通常取上述值之一（50或75歐姆），因為您可能正在與高速/RF系統中的其中一種介質(zhì)接口。我更愿意把參考阻抗看成是你想要的終端阻抗；每個(gè)端口的阻抗為75或50歐姆S參數測量向你展示你在設計中是如何偏離這個(gè)目標的。</span></p><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">如果您的PCB上有一個(gè)互連的測量S參數矩陣，您可以通過(guò)以下轉換將其轉換為新的S參數矩陣：</span></p><div id="wiwf3gg" class="pgc-img" style="box-sizing: border-box; margin: 18px 0px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><img src="http://uphotos.eepw.com.cn/1658581631/pics/1675059739924979.png" title="1675059739924979.png" alt="image.png" /><p class="pgc-img-caption" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; border: 0px; position: relative; text-align: center; font-size: 14px; line-height: 20px; color: rgb(153, 153, 153);">具有兩個(gè)不同參考阻抗的S參數矩陣之間的變換。</p></div><p style="box-sizing: border-box; margin-top: 20px; margin-bottom: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; font-size: 18px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><span style="box-sizing: border-box; margin: 0px; padding: 0px; border: 0px; color: rgb(59, 59, 59); --tt-darkmode-color: #A3A3A3;">這有助于了解當您切換參考介質(zhì)（例如，75至50歐姆阻抗電纜）時(shí)，S參數的變化情況。通過(guò)使用“參考介質(zhì)”一詞，我們將DUT/互連與理想化的50/75歐姆電纜、50/75歐姆端口或其他輸入阻抗為50/75歐姆的組件進(jìn)行比較。</span></p><p style="box-sizing: border-box; margin-top: 20px; padding: 0px; border: 0px; color: rgb(34, 34, 34); font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; 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