{"id":4223,"date":"2025-11-04T08:07:24","date_gmt":"2025-11-04T08:07:24","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4223"},"modified":"2025-11-04T08:07:27","modified_gmt":"2025-11-04T08:07:27","slug":"pcb-stack-up-design-to-reduce-emi","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/pcb-stack-up-design-to-reduce-emi\/","title":{"rendered":"PCB Stack-Up Design for at reducere EMI"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Introduktion<\/h2>\n\n\n\n<p>Informationsalderen er kommet, og brugen af printkort bliver ved med at vokse. PCB-designs bliver mere og mere komplekse. N\u00e5r elektroniske dele placeres t\u00e6ttere p\u00e5 hinanden p\u00e5 printkort, bliver elektrisk interferens et almindeligt problem. P\u00e5 flerlagskort skal signallag og str\u00f8m- eller jordlag adskilles. Det g\u00f8r stack-up-design og lagr\u00e6kkef\u00f8lge meget vigtigt. En god stack-up kan reducere EMI og krydstale meget.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvorfor bruge flerlagsplader?<\/h2>\n\n\n\n<p>Sammenlignet med enkeltlagskort tilf\u00f8jer flerlagskort signallag, routinglag og separate str\u00f8m- og jordplaner. Den st\u00f8rste fordel er, at de giver en stabil sp\u00e6nding til digitale signaler. De spreder str\u00f8mmen j\u00e6vnt til alle dele. Det hj\u00e6lper med at s\u00e6nke st\u00f8jen mellem signalerne.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Effektplan og jordplan<\/h2>\n\n\n\n<p>Ved at bruge store kobberplader til str\u00f8m og et solidt jordplan s\u00e6nkes modstanden i disse planer. Lavere modstand holder sp\u00e6ndingen i effektplanet stabil. Det hj\u00e6lper hver signallinje med at bevare sin karakteristiske impedans. Stabil impedans hj\u00e6lper med at reducere refleksioner og lavere krydstale. I high-end PCB-design v\u00e6lger designere ofte stack-ups med mere end seks lag. Flerlagskort sl\u00e5r enkelt- eller lavlagskort p\u00e5 elektrisk ydeevne og p\u00e5 at reducere elektromagnetisk str\u00e5ling. Omkostningerne stiger med flere lag. Prisen p\u00e5 printkort afh\u00e6nger af antallet af lag og t\u00e6theden af routing pr. arealenhed. Hvis man sk\u00e6rer i lagene for at spare penge, mister man plads til routing. Det \u00f8ger routing-t\u00e6theden. Du kan f\u00e5 brug for smallere spor og mindre mellemrum for at opfylde designet. Disse \u00e6ndringer kan \u00f8ge omkostningerne eller g\u00f8re kortet sv\u00e6rere at lave. At sk\u00e6re i lag kan s\u00e6nke omkostningerne, men det kan g\u00e5 ud over den elektriske ydeevne. Det valg kan give bagslag.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mikrostrip, returvej og jordplan som en del af transmissionslinjen<\/h2>\n\n\n\n<p>Hvis man ser p\u00e5 et PCB-mikrostrip-layout som en model, kan jordplanet v\u00e6re en del af transmissionslinjen. Jordkobberet under et signalspor fungerer som returvej for signalet. Effektplanet er bundet til jord gennem afkoblingskondensatorer i AC-visningen. Disse to planer fungerer p\u00e5 samme m\u00e5de for signalretur. Forskellen mellem lavfrekvente og h\u00f8jfrekvente str\u00f8msl\u00f8jfer er, hvordan returstr\u00f8mmen finder sin vej. Ved lav frekvens vender str\u00f8mmen tilbage ad den vej, der har mindst modstand. Ved h\u00f8j frekvens vender str\u00f8mmen tilbage ad den vej, der har mindst induktans. Returstr\u00f8mmen har en tendens til at koncentrere sig direkte under signalsporet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">H\u00f8jfrekvent returstr\u00f8m og selvafsk\u00e6rmning<\/h2>\n\n\n\n<p>Ved h\u00f8je frekvenser, hvis et spor ligger lige over jordoverfladen, selv med mange returveje, vil str\u00f8mmen vende tilbage under signalsporet p\u00e5 det n\u00e6rmeste routinglag, der f\u00f8rer tilbage til kilden. Den sti har den laveste impedans. Ved at bruge store afkoblingskondensatorer til at forbinde str\u00f8m til jord undertrykker man elektriske felter ved hj\u00e6lp af kapacitans. Hvis returvejen har lav induktans, undertrykkes magnetfelterne. Denne kombination af effekter holder nettoreaktansen lav. Det kalder vi selvafsk\u00e6rmning.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Loop-omr\u00e5de, afstand og str\u00f8mt\u00e6thed<\/h2>\n\n\n\n<p>Ud fra ligningerne for returstr\u00f8m kan vi se, at returstr\u00f8mst\u00e6theden er omvendt relateret til afstanden fra signalsporet. En mindre afstand giver et mindre loop-areal og en mindre induktans. Vi kan ogs\u00e5 se, at hvis signallinjen og returvejen er t\u00e6t p\u00e5 hinanden, er str\u00f8mmene i dem lige store og har modsatrettet retning. Deres magnetfelter oph\u00e6ver hinanden i det n\u00e6re rum. Det g\u00f8r ekstern EMI meget lille. I stack-up-design er det bedst at placere et jordplan t\u00e6t p\u00e5 hvert signallag.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Krydstale for\u00e5rsaget af gensidig induktans<\/h2>\n\n\n\n<p>Ved krydstale i jordplan for\u00e5rsager h\u00f8jfrekvente kredsl\u00f8b hovedsageligt krydstale ved induktiv kobling. Ud fra formlen for returstr\u00f8m danner to n\u00e6rliggende signalspor overlappende str\u00f8msl\u00f8jfer. Disse overlappende sl\u00f8jfer skaber interferens i magnetfeltet. Koblingsfaktoren K i formlen afh\u00e6nger af signalets stigningstid og af l\u00e6ngden p\u00e5 det forstyrrende spor. I opstillingen reduceres interferensen fra jordplanet ved at bringe signallaget og jordplanet t\u00e6ttere p\u00e5 hinanden.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kobberst\u00f8bninger, spalter og isoleringsv\u00e6gge<\/h2>\n\n\n\n<p>N\u00e5r designere st\u00f8ber kobber til str\u00f8m og jord, skal de v\u00e6re forsigtige med ikke at skabe en isolationsv\u00e6g i st\u00f8beomr\u00e5det. Dette problem opst\u00e5r ofte p\u00e5 grund af for mange vias eller en d\u00e5rlig via-isoleringsplan. Resultatet kan v\u00e6re en langsom edge rise, et st\u00f8rre loop-omr\u00e5de, h\u00f8jere induktans og mere krydstale og EMI.<\/p>\n\n\n\n<p>Via-t\u00e6thed og via-hegn kan dele jordoverfladen op i \u00f8er. Disse \u00f8er tvinger returstr\u00f8mmen til at tage en l\u00e6ngere vej. Det \u00f8ger looparealet og induktansen. For at undg\u00e5 dette skal du designe via-placering og planopdelinger, s\u00e5 returstr\u00f8mmen kan flyde j\u00e6vnt. N\u00e5r du er n\u00f8dt til at opdele planer til forskellige sp\u00e6ndinger, skal du placere stitching vias og holde afkoblingen t\u00e6t p\u00e5 enhederne.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Parring af kobbersk\u00e6nkninger for procesbalance<\/h2>\n\n\n\n<p>N\u00e5r vi l\u00e6gger kobber i printet, skal vi fors\u00f8ge at placere udst\u00f8bninger parvis for at opn\u00e5 balance i processen. Dette er et problem ved PCB-produktion. Ubalanceret kobber kan g\u00f8re printet sk\u00e6vt. For hvert signallag er det bedst at have et matchende kobberlag som nabo. Afstanden mellem et h\u00f8jstr\u00f8msplan og et n\u00e6rliggende kobberlag p\u00e5virker stabiliteten og EMI. I h\u00f8jhastighedskortdesign er det almindeligt at tilf\u00f8je ekstra jordlag for at adskille signallagene. Disse ekstra jordlag fungerer som skjold og hj\u00e6lper med at holde EMI nede.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Afkobling og returvej t\u00e6t p\u00e5 kilden<\/h2>\n\n\n\n<p>Hold afkoblingskondensatorer t\u00e6t p\u00e5 enhedernes str\u00f8mstifter. Afkoblingskondensatorer binder str\u00f8m- og jordplanerne sammen ved h\u00f8j frekvens. God afkobling giver en kort returvej i n\u00e6rheden af enheden. Det reducerer loop-omr\u00e5det og s\u00e6nker induktansen. Korte sl\u00f8jfer s\u00e6nker EMI og krydstale.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Impedansstyring og sporingsegenskaber<\/h2>\n\n\n\n<p>Styring af sporimpedans betyder, at sporets geometri og dielektriske egenskaber holdes stabile. En stabil impedans holder signalerne rene og reducerer refleksioner. For at kontrollere impedansen skal du placere sporet over et solidt referenceplan og holde afstanden og den dielektriske konstant konsistent. Jordreference lige under sporet giver god mikrostrip- eller stripline-opf\u00f8rsel. Det hj\u00e6lper b\u00e5de single-ended og differentielle par.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Differentielle par og common-mode-st\u00f8j<\/h2>\n\n\n\n<p>Differentielle par har brug for en t\u00e6t afstand og et solidt referenceplan for at holde den differentielle impedans stabil. Differentialsignalering reducerer common-mode-st\u00f8j, hvis parret er godt dirigeret. Hold parret sammen, undg\u00e5 stubbe, og hold returplanet t\u00e6t. Det reducerer b\u00e5de udstr\u00e5let EMI og krydstale til n\u00e6rliggende net.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Routing-regler og afvejning af antal lag<\/h2>\n\n\n\n<p>N\u00e5r antallet af lag g\u00e5r ned, g\u00e5r pladsen til routing ogs\u00e5 ned. Det tvinger designerne til at reducere sporbredde og mellemrum. Den h\u00f8jere routingt\u00e6thed kan \u00f8ge krydstale og impedansvariation. I mange designs er det rigtige valg at acceptere et h\u00f8jere antal lag for at g\u00f8re routing lettere og for at bevare den elektriske ydeevne. Omkostningerne ved flere lag er reelle, men d\u00e5rlig signalintegritet kan koste mere i fejls\u00f8gningstid og produktfejl.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">H\u00f8jhastighedskort og ekstra jordlag<\/h2>\n\n\n\n<p>H\u00f8jhastighedskort har fordel af at tilf\u00f8je jordlag for at isolere signallagene. Det reducerer koblingen mellem signaler p\u00e5 forskellige lag. De ekstra jordlag fungerer som afsk\u00e6rmninger. De giver en n\u00e6rliggende returvej med lav induktans. Det reducerer EMI og g\u00f8r timingen mere forudsigelig.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Praktiske tips til stack-up og routing<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>S\u00e6t et solidt jordplan t\u00e6t p\u00e5 hvert h\u00f8jhastighedssignallag.<\/li>\n\n\n\n<li>Brug powerplanes med bred kobberh\u00e6ldning, og hold dem med lav modstand.<\/li>\n\n\n\n<li>Placer afkoblingsh\u00e6tter n\u00e6r str\u00f8mstifterne, og forbind str\u00f8m til jord med korte stier.<\/li>\n\n\n\n<li>Undg\u00e5 plane splits under h\u00f8jhastighedsspor. Hvis du er n\u00f8dt til at splitte, skal du tilf\u00f8je vias i n\u00e6rheden af sporet.<\/li>\n\n\n\n<li>Hold \u00f8je med t\u00e6theden, s\u00e5 du ikke skaber afbrydelser i flyet.<\/li>\n\n\n\n<li>Hold sporene korte og undg\u00e5 stubbe.<\/li>\n\n\n\n<li>Brug differentielle par til signaler, der kr\u00e6ver st\u00f8jimmunitet.<\/li>\n\n\n\n<li>V\u00e6lg en opstilling, der holder returvejen kort og loopomr\u00e5det lille.<\/li>\n\n\n\n<li>Balancer kobberet p\u00e5 de yderste lag for at reducere sk\u00e6vvridning.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sammenfatning<\/h2>\n\n\n\n<p>N\u00e5r elektronikken bliver t\u00e6ttere, bliver EMI og krydstale et st\u00f8rre problem. PCB'er i flere lag giver v\u00e6rkt\u00f8jer til at bek\u00e6mpe disse problemer. Str\u00f8m- og jordplaner, parvis kobberudst\u00f8bning, t\u00e6t stabling og god afkobling hj\u00e6lper alt sammen. En omhyggelig lagplan og routingpraksis s\u00e6nker loopomr\u00e5det og induktansen. Det reducerer EMI og krydstale. I sidste ende sparer gode valg af stack-up og routing tid og penge ved at reducere risikoen for fejlfinding og fejl.<\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction The information age is here, and PCB use keeps growing. PCB designs are getting more complex. As electronic parts 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