匯合電路是專業(yè)的線路板打樣服務(wù)商，專注于高精密多層板、特種板的研發(fā)，以及pcb打樣和中小批量板的生產(chǎn)制造。最近許多客戶向我們咨詢：如果PCB選材不一樣，是否有不良的影響？
首先，通過(guò)線路板打樣出的印刷電路板的信號(hào)具有依賴于印刷電路板的介電常數(shù)的速度。例如，當(dāng)信號(hào)頻率超過(guò)5 GHz時(shí)，F(xiàn)R- 4的典型介電常數(shù)（約4.7）下降到接近4。然而，羅杰斯RO4350材料的相對(duì)介電常數(shù)從0到15 GHz是恒定的（大約3.5）。如果印刷電路板的介電常數(shù)相對(duì)于頻率變化，那么信號(hào)的不同頻率分量將具有不同的速度。這意味著，這些組件將在不同的時(shí)間達(dá)到負(fù)載。結(jié)果，這會(huì)導(dǎo)致數(shù)字信號(hào)的失真。
Secondly, the signal losses due to printed circuit board material increase with frequency. Again, each harmonic of the digital signal will be attenuated according to that frequency of operation. Increased loss of the signal components will add to the distortion of the digital signal.
????其次，由于印刷電路板材料的信號(hào)損失隨頻率增加。再次，數(shù)字信號(hào)的每一個(gè)諧波將根據(jù)該操作頻率衰減。信號(hào)分量的增加會(huì)增加數(shù)字信號(hào)的失真。所以，線路板打樣的選材會(huì)影響線路板質(zhì)量。
Printed circuit board layout is often the single most important factor affecting the electromagnetic compatibility of electronic systems. Boards that are auto-routed or laid out according to a list of "design rules" do not usually meet electromagnetic compatibility requirements on the first pass; and the products using these boards are more likely to require expensive fixes such as ferrites on cables and shielded enclosures. Taking the time to ensure that components are properly placed and traces are optimally routed will generally result in products that meet all electromagnetic compatibility and signal integrity requirements on time and on budget.
????因?yàn)橛∷㈦娐钒宀季滞怯绊戨娮酉到y(tǒng)電磁兼容性的最重要的因素。根據(jù)“設(shè)計(jì)規(guī)則”列表自動(dòng)布線或布置的板通常不滿足第一道次的電磁兼容性要求；使用這些板的產(chǎn)品更可能需要昂貴的修復(fù)件，例如在電纜和屏蔽外殼上的鐵氧體?；〞r(shí)間來(lái)確保組件被適當(dāng)放置，并且軌跡被最佳路由，通常會(huì)導(dǎo)致產(chǎn)品在時(shí)間和預(yù)算上滿足所有電磁兼容性和信號(hào)完整性要求。這也表明線路板打樣的選材尤為重要。
相關(guān)閱讀：影響PCB打樣廠生產(chǎn)電路板可焊性的因素《二》【匯合電路】
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