{"id":4666,"date":"2026-01-22T07:41:45","date_gmt":"2026-01-22T07:41:45","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4666"},"modified":"2026-01-22T07:41:50","modified_gmt":"2026-01-22T07:41:50","slug":"pcb-stackup-design-from-2-to-8-layers-for-emi-control","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/pcb-stackup-design-from-2-to-8-layers-for-emi-control\/","title":{"rendered":"PCB-stackup-design fra 2 til 8 lag til EMI-kontrol"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Kerneprincipper for stackup-design<\/h2>\n\n\n\n<p>Overordnet set skal stackup-design f\u00f8lge to regler:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hvert routinglag skal have et n\u00e6rliggende referencelag. Referencelaget kan v\u00e6re et effektplan eller et jordplan.<\/li>\n\n\n\n<li>Hold str\u00f8mforsyningsplanet og jordplanet s\u00e5 t\u00e6t p\u00e5 hinanden som muligt. Det giver en st\u00f8rre koblingskapacitans.<\/li>\n<\/ul>\n\n\n\n<p>Nedenfor er der eksempler p\u00e5 stackups fra to-lags boards op til otte-lags boards.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Core-Principles-of-Stackup-Design.webp\" alt=\"Core Principles of Stackup Design\" class=\"wp-image-4667\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Core-Principles-of-Stackup-Design.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Core-Principles-of-Stackup-Design-300x188.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Core-Principles-of-Stackup-Design-768x480.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Core-Principles-of-Stackup-Design-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. Opstablingsskemaer efter antal PCB-lag<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 Opbygning af et- og to-lags kort<\/h3>\n\n\n\n<p>For to-lags boards er antallet af lag lavt. Stackup-problemer eksisterer ikke p\u00e5 samme m\u00e5de, som de g\u00f8r for kort med mange lag. Kontrol af EMI-str\u00e5ling skal komme fra routing og layout.<\/p>\n\n\n\n<p><a href=\"https:\/\/flj-pcb.com\/da\/pcb-manufacturer\/single-sided-pcb\/\" data-type=\"page\" data-id=\"2625\">Enkelt lag<\/a> og dobbeltlagskort har voksende EMC-problemer. Hoved\u00e5rsagen er, at signall\u00f8kkeomr\u00e5der kan blive store. Store loop-omr\u00e5der giver ikke kun st\u00e6rk str\u00e5ling, de g\u00f8r ogs\u00e5 kredsl\u00f8bet f\u00f8lsomt over for st\u00f8j udefra. For at forbedre EMC er det enkleste skridt at reducere loopomr\u00e5det for n\u00f8glesignaler.<\/p>\n\n\n\n<p>Vigtige signaler: Ud fra et EMC-synspunkt er n\u00f8glesignaler dem, der giver st\u00e6rk udstr\u00e5ling, og dem, der er f\u00f8lsomme over for udefrakommende st\u00f8j. Signaler med st\u00e6rk udstr\u00e5ling er normalt periodiske signaler. Disse omfatter ure og adressesignaler af lav orden. Signaler, der er f\u00f8lsomme over for st\u00f8j, er normalt analoge signaler p\u00e5 lavt niveau.<\/p>\n\n\n\n<p>Enkelt- og dobbeltlagskort bruges normalt i lavfrekvente analoge designs under 10 kHz. Brug disse grundl\u00e6ggende regler:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>F\u00f8r str\u00f8m i samme lag p\u00e5 en radial m\u00e5de, n\u00e5r du kan. Pr\u00f8v at holde den samlede l\u00e6ngde af sporene lille.<\/li>\n\n\n\n<li>Hold str\u00f8m- og jordledninger t\u00e6t p\u00e5 hinanden. Placer et jordspor ved siden af et n\u00f8glesignal. L\u00e6g jordsporet s\u00e5 t\u00e6t p\u00e5 signalet som muligt. Det skaber et lille loop-omr\u00e5de. Et lille loop-omr\u00e5de mindsker common-mode-str\u00e5ling og reducerer, hvor f\u00f8lsomt signalet er over for st\u00f8j udefra. N\u00e5r du l\u00e6gger et jordspor ved siden af signalet, vil den lille sl\u00f8jfe tiltr\u00e6kke signalets returstr\u00f8m. Signalstr\u00f8mmen g\u00e5r s\u00e5 gennem denne lille sl\u00f8jfe og ikke gennem andre jordbaner.<\/li>\n\n\n\n<li>P\u00e5 et dobbeltsidet kort skal du placere et bredt jordspor p\u00e5 den anden side af kortet lige under signalsporet. G\u00f8r dette jordspor s\u00e5 bredt som muligt. Det giver et loop-omr\u00e5de, der svarer til printpladens tykkelse gange signall\u00e6ngden.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 Opbygning af fire lags kort<\/h3>\n\n\n\n<p>Almindelige fire-lags opstillinger omfatter:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SIG - GND (eller PWR) - PWR (eller GND) - SIG<\/li>\n\n\n\n<li>GND - SIG (eller PWR) - SIG (eller PWR) - GND<\/li>\n<\/ol>\n\n\n\n<p>For begge disse opstillinger er der et potentielt problem med en standardpladetykkelse p\u00e5 1,6 mm (62 mil). Afstanden mellem lagene bliver stor. Stor afstand g\u00f8r det sv\u00e6rt at kontrollere impedans, lagkobling og afsk\u00e6rmning. Is\u00e6r hvis afstanden mellem str\u00f8m- og jordplan er stor, falder kortets kapacitans. Lav kortkapacitans er ikke god til at filtrere st\u00f8j.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"445\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Four-Layer-Board-Stackups.webp\" alt=\"Four-Layer Board Stackups\" class=\"wp-image-4668\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Four-Layer-Board-Stackups.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Four-Layer-Board-Stackups-300x167.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Four-Layer-Board-Stackups-768x427.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Four-Layer-Board-Stackups-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">For den f\u00f8rste opstilling (SIG - GND\/PWR - PWR\/GND - SIG)<\/h4>\n\n\n\n<p>Folk bruger det ofte, n\u00e5r der er mange chips p\u00e5 kortet. Denne opbygning giver god signalintegritet. EMI-ydelsen er ikke s\u00e5 god. Du skal kontrollere EMI ved hj\u00e6lp af omhyggelig routing og andre detaljer.<\/p>\n\n\n\n<p>Vigtige punkter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Placer jordplanet ved siden af det signallag, der har den t\u00e6tteste routing. Det hj\u00e6lper med at absorbere og reducere str\u00e5ling.<\/li>\n\n\n\n<li>For\u00f8g ogs\u00e5 tavlearealet. F\u00f8lg 20H-reglen.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">For den anden opstilling (GND - SIG\/PWR - SIG\/PWR - GND)<\/h4>\n\n\n\n<p>Folk bruger det, n\u00e5r chipt\u00e6theden er lav, og n\u00e5r chipomr\u00e5det har plads til str\u00f8mforsyninger af kobber. I dette design er de ydre lag jordplaner, og de to indre lag er signal- eller str\u00f8mlag. F\u00f8r str\u00f8mmen p\u00e5 signallaget med brede spor. Brede spor g\u00f8r str\u00f8mvejsimpedansen lav og mikrostrip-signalimpedansen lav. De ydre jordlag kan afsk\u00e6rme de indre signaler fra at str\u00e5le. Ud fra et EMI-kontrolsynspunkt er dette den bedste firelags PCB-struktur, der findes nu.<\/p>\n\n\n\n<p>Vigtige punkter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hold afstanden mellem de to indre lag med blandet signal og effekt st\u00f8rre.<\/li>\n\n\n\n<li>G\u00f8r routing-retningerne ortogonale mellem disse lag for at undg\u00e5 crosstalk.<\/li>\n\n\n\n<li>Kontroll\u00e9r tavleomr\u00e5det, og f\u00f8lg 20H-reglen.<\/li>\n\n\n\n<li>Hvis du skal kontrollere routing-impedansen, skal du placere sporene omhyggeligt under kobber\u00f8erne til str\u00f8m og jord.<\/li>\n\n\n\n<li>Fors\u00f8g ogs\u00e5 at sammenkoble kobbertr\u00e5de p\u00e5 str\u00f8m- eller jordlagene s\u00e5 meget som muligt. Det giver en god DC- og lavfrekvensforbindelse.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2.3 Opbygning af seks lags kort<\/h3>\n\n\n\n<p>Til design med h\u00f8j chipt\u00e6thed og h\u00f8j clockhastighed b\u00f8r man overveje seks-lags kort. To anbefalede seks-lags stackups er som f\u00f8lger:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Mulighed 1: SIG - GND - SIG - PWR - GND - SIG<\/h4>\n\n\n\n<p>Med dette skema f\u00e5r du god signalintegritet. Hvert signallag sidder ved siden af et jordplan. Str\u00f8m- og jordplanerne er parret. Du kan kontrollere impedansen for hvert routinglag godt. Begge jordplaner kan absorbere magnetisk flux godt. Med fuldt str\u00f8m- og jordplan har hvert signallag en god returvej.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"449\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Six-Layer-Board-Stackups.webp\" alt=\"Six-Layer Board Stackups\" class=\"wp-image-4670\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Six-Layer-Board-Stackups.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Six-Layer-Board-Stackups-300x168.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Six-Layer-Board-Stackups-768x431.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Six-Layer-Board-Stackups-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Mulighed 2: GND - SIG - GND - PWR - SIG - GND<\/h4>\n\n\n\n<p>Denne mulighed passer til tavler, hvor enhedst\u00e6theden ikke er s\u00e6rlig h\u00f8j. Den bevarer fordelene ved den f\u00f8rste l\u00f8sning. Desuden er de \u00f8verste og nederste jordplaner mere kontinuerlige. De fungerer som gode afsk\u00e6rmninger.<\/p>\n\n\n\n<p>Bem\u00e6rk: Placer str\u00f8mforsyningen n\u00e6r den side, der ikke er hovedkomponentens overflade. S\u00e5 bliver bundplanet mere komplet, og EMI-pr\u00e6stationen bliver bedre end ved den f\u00f8rste l\u00f8sning.<\/p>\n\n\n\n<p>Oversigt over seks-lags plader:<\/p>\n\n\n\n<p>Hold afstanden mellem str\u00f8m- og jordplan s\u00e5 lille som muligt. Det giver en god str\u00f8m-jord-kobling. Med en pladetykkelse p\u00e5 62 mil er lagafstanden mindre end med fire lag. Alligevel er det ikke let at g\u00f8re afstanden mellem hovedstr\u00f8m og jord meget lille. Sammenlignet med den anden mulighed koster den f\u00f8rste mulighed mindre. S\u00e5 vi v\u00e6lger ofte den f\u00f8rste form til praktisk stabling. F\u00f8lg 20H-reglen og spejllagsreglen i designet.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.4 Opbygning af otte-lags kort<\/h3>\n\n\n\n<p>Otte-lags kort har mange mulige opstillinger. Nogle er v\u00e6rre for EMI p\u00e5 grund af d\u00e5rlig absorption og stor str\u00f8mimpedans. Her er tre former beskrevet:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Type A (ikke god)<\/h4>\n\n\n\n<p>Denne form har lavere elektromagnetisk absorption og st\u00f8rre effektimpedans. Dens lagr\u00e6kkef\u00f8lge er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signal 1: komponentside, mikrostrip-routing-lag<\/li>\n\n\n\n<li>Signal 2: indre mikrostrip-routinglag, godt routinglag (X-retning)<\/li>\n\n\n\n<li>Jord<\/li>\n\n\n\n<li>Signal 3: stripline routing-lag, godt routing-lag (Y-retning)<\/li>\n\n\n\n<li>Signal 4: stripline-routing-lag<\/li>\n\n\n\n<li>Kraft<\/li>\n\n\n\n<li>Signal 5: indre mikrostrip-routing-lag<\/li>\n\n\n\n<li>Signal 6: mikrostrip-routing-lag<\/li>\n<\/ul>\n\n\n\n<p>Denne form er ikke et godt valg, fordi den ikke giver ensartede referencer for alle signallag. Str\u00f8mimpedansen er h\u00f8j, og EMI-kontrollen er svag.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Type B (variant med tilf\u00f8jede referencelag)<\/h4>\n\n\n\n<p>Dette er en variant af en tredje type. Ved at tilf\u00f8je referencelag f\u00e5r den en bedre EMI-ydelse. Den karakteristiske impedans for hvert signallag kan kontrolleres godt. En mulig r\u00e6kkef\u00f8lge er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signal 1: komponentside, mikrostrip-routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Jord: god b\u00f8lgeabsorption<\/li>\n\n\n\n<li>Signal 2: stripline routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Power: dette power-plan og jorden under det udg\u00f8r en god elektromagnetisk absorption<\/li>\n\n\n\n<li>Jord: jordplan<\/li>\n\n\n\n<li>Signal 3: stripline routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Effekt: dette effektplan har st\u00f8rre effektimpedans<\/li>\n\n\n\n<li>Signal 4: mikrostrip-routing-lag, godt routing-lag<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Type C (bedste praksis)<\/h4>\n\n\n\n<p>Dette er den bedste opstillingsform. Den bruger flere jordreferenceplaner. Det giver en meget god elektromagnetisk absorption. En almindelig r\u00e6kkef\u00f8lge er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Signal 1: komponentside, mikrostrip-routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Jord: god b\u00f8lgeabsorption<\/li>\n\n\n\n<li>Signal 2: stripline routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Power: dette power-plan og jorden under det udg\u00f8r en fremragende elektromagnetisk absorption<\/li>\n\n\n\n<li>Jord: jordplan<\/li>\n\n\n\n<li>Signal 3: stripline routing-lag, godt routing-lag<\/li>\n\n\n\n<li>Jord: andet jordplan, god b\u00f8lgeabsorption<\/li>\n\n\n\n<li>Signal 4: mikrostrip-routing-lag, godt routing-lag<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3. S\u00e5dan v\u00e6lger du lagantal og opstabling<\/h2>\n\n\n\n<p>V\u00e6lg antallet af lag og opstablingsformen ud fra mange faktorer. Disse omfatter: antallet af signalnet p\u00e5 kortet, komponentt\u00e6thed, pin-t\u00e6thed, signalfrekvenser og kortets st\u00f8rrelse. Overvej alle disse faktorer sammen.<\/p>\n\n\n\n<p>Bem\u00e6rkninger om design:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hvis der er mange signalnet, skal du designe med flere lag.<\/li>\n\n\n\n<li>Hvis komponentt\u00e6theden er h\u00f8j, skal du v\u00e6lge flere lag.<\/li>\n\n\n\n<li>Hvis pin-t\u00e6theden er h\u00f8j, skal du v\u00e6lge flere lag.<\/li>\n\n\n\n<li>Hvis signalfrekvensen er h\u00f8j, skal du v\u00e6lge flere lag.<\/li>\n\n\n\n<li>For at f\u00e5 en god EMI-ydelse skal man s\u00f8rge for, at hvert signallag har sit eget referencelag. Et referencelag kan v\u00e6re jord eller str\u00f8m. Det hj\u00e6lper med at kontrollere impedansen og giver t\u00e6tte returveje. T\u00e6tte returveje s\u00e6nker looparealet. Et lavere loop-omr\u00e5de reducerer str\u00e5ling og f\u00f8lsomhed over for interferens.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">4. Enkle regler, der skal f\u00f8lges i alle designs<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Giv hvert routinglag et referenceplan i n\u00e6rheden. Det hj\u00e6lper med at kontrollere impedans og returstr\u00f8m.<\/li>\n\n\n\n<li>Par str\u00f8m- og jordplaner, n\u00e5r du kan. Hold afstanden lille. Det \u00f8ger planets kapacitans. H\u00f8j planekapacitans s\u00e6nker st\u00f8jen.<\/li>\n\n\n\n<li>S\u00e6t jordplanet ved siden af det signallag, der har t\u00e6t routing. Det hj\u00e6lper med at absorbere og stoppe str\u00e5ling.<\/li>\n\n\n\n<li>Brug ortogonal routing p\u00e5 tilst\u00f8dende signallag for at mindske crosstalk.<\/li>\n\n\n\n<li>Brug brede baner til str\u00f8mf\u00f8ring i blandede lag for at holde str\u00f8mvejsimpedansen lav.<\/li>\n\n\n\n<li>Koblingskobber h\u00e6ldes p\u00e5 str\u00f8m- og jordplaner for at f\u00e5 st\u00e6rke j\u00e6vnstr\u00f8ms- og lavfrekvensforbindelser.<\/li>\n\n\n\n<li>F\u00f8lg 20H-reglen, n\u00e5r du indstiller bordomr\u00e5det, og husk reglerne for design af spejllag.<\/li>\n\n\n\n<li>I h\u00f8jhastigheds- eller h\u00f8jdensitetsdesign skal man foretr\u00e6kke seks- eller otte-lags kort, s\u00e5 hvert signallag kan have en t\u00e6t reference.<\/li>\n\n\n\n<li>Til lavfrekvente analoge designs kan et eller to lags kort fungere, hvis du holder loop-omr\u00e5derne sm\u00e5 og placerer jord i n\u00e6rheden af signalerne.<\/li>\n\n\n\n<li>N\u00e5r du kan, skal du g\u00f8re de indre str\u00f8m- og jordplaner t\u00e6tte. Det forbedrer afkoblingen og reducerer EMI.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. Afsluttende note<\/h2>\n\n\n\n<p>Valg af stackup er en systemhandel. Se p\u00e5 net, layout, komponentplacering, pin-antal og frekvens p\u00e5 \u00e9n gang. For bedre EMI og signalkontrol skal du give hvert signallag en klar reference i n\u00e6rheden. Brug parrede planer og smalle planafstande, n\u00e5r det er muligt. Brug flere jordplaner for at opn\u00e5 den bedste elektromagnetiske absorption i kort med mange lag. N\u00e5r du designer, skal du afveje omkostninger og ydeevne. F\u00f8lg de enkle regler ovenfor, og v\u00e6lg den stackup, der passer til dine printkortbehov.<\/p>","protected":false},"excerpt":{"rendered":"<p>1. Core Principles of Stackup Design Overall, stackup design must follow two rules: Below are example stackups from two-layer boards 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