{"id":1398,"date":"2025-12-02T07:16:30","date_gmt":"2025-12-02T07:16:30","guid":{"rendered":"https:\/\/fljpcb.com\/?p=1398"},"modified":"2025-12-03T01:10:33","modified_gmt":"2025-12-03T01:10:33","slug":"pcb-grounding-guide-essential-rules-for-clean-routing","status":"publish","type":"post","link":"https:\/\/fljpcb.com\/da\/pcb-grounding-guide-essential-rules-for-clean-routing\/","title":{"rendered":"Guide til PCB-jording: V\u00e6sentlige regler for ren rutning"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-1-layout\">1. Layout<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-component-placement-ten-rules\">Placering af komponenter - ti regler<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>F\u00f8lg reglen \u201cplacer stort f\u00f8r sm\u00e5t, placer sv\u00e6rt f\u00f8r let\u201d. Vigtige kredsl\u00f8bsblokke og n\u00f8gledele skal placeres f\u00f8rst.<\/li>\n\n\n\n<li>Brug det skematiske blokdiagram som vejledning. Placer hoveddelene, s\u00e5 de passer til kortets hovedsignalflow.<\/li>\n\n\n\n<li>Placer delene, s\u00e5 det er nemt at teste og reparere dem. Placer ikke store dele ved siden af sm\u00e5 dele, som der skal v\u00e6re adgang til. Lad der v\u00e6re tilstr\u00e6kkelig plads omkring dele, der skal testes eller justeres.<\/li>\n\n\n\n<li>Brug s\u00e5 vidt muligt et symmetrisk layout til gentagne kredsl\u00f8bsblokke. Symmetri g\u00f8r det nemmere at gentage og teste.<\/li>\n\n\n\n<li>Optimer layoutet med j\u00e6vn fordeling, balance i tyngdepunktet og et p\u00e6nt board-look.<\/li>\n\n\n\n<li>Placer den samme type gennemg\u00e5ende dele i samme X- eller Y-retning. For polariserede diskrete dele af samme type skal du holde deres orientering ensartet i X eller Y for at lette montering og inspektion.<\/li>\n\n\n\n<li>Spred varmegenererende dele ud over pladen, s\u00e5 pladen og det f\u00e6rdige produkt afk\u00f8les bedre. Placer temperaturf\u00f8lsomme dele v\u00e6k fra varme dele. Placer ikke temperatursensorer ved siden af varme komponenter, undtagen n\u00e5r sensoren skal m\u00e5le varmen.<\/li>\n\n\n\n<li>Pr\u00f8v at opfylde disse ledningsbehov: Hold den samlede sporl\u00e6ngde kort, og g\u00f8r de vigtigste signalspor til de korteste. Hold h\u00f8jsp\u00e6ndings- eller h\u00f8jstr\u00f8msspor langt v\u00e6k fra svage lavsp\u00e6ndings- eller lavstr\u00f8mssignaler. Adskil analoge signaler fra digitale signaler. Hold h\u00f8jfrekvente signaler v\u00e6k fra lavfrekvente signaler. S\u00f8rg for tilstr\u00e6kkelig afstand omkring h\u00f8jfrekvente dele.<\/li>\n\n\n\n<li>Placer afkoblingskondensatorer s\u00e5 t\u00e6t som muligt p\u00e5 IC'ens str\u00f8mstifter. G\u00f8r sl\u00f8jfen, der g\u00e5r fra str\u00f8m til kondensator til jord, s\u00e5 kort som muligt.<\/li>\n\n\n\n<li>N\u00e5r du placerer dele, skal du fors\u00f8ge at placere dele, der bruger samme str\u00f8mskinne, t\u00e6t p\u00e5 hinanden. Det g\u00f8r det lettere at opdele str\u00f8mforsyningen senere.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-routing-traces\">2. Routing (spor)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-routing-priority\">(A) Routing-prioritet<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vigtige signaler f\u00f8rst: F\u00f8r kritiske spor som sm\u00e5 analoge signaler, h\u00f8jhastighedslinjer, clocksignaler og synkrone linjer f\u00f8r andre.<\/li>\n\n\n\n<li>T\u00e6thed f\u00f8rst: Start routing i omr\u00e5det med de mest komplekse forbindelser p\u00e5 br\u00e6ttet. Begynd fra den mest overfyldte region.<\/li>\n<\/ul>\n\n\n\n<p>Noter:<br>a. Giv clock-, h\u00f8jhastigheds- og f\u00f8lsomme signaler dedikerede routinglag, n\u00e5r du kan. G\u00f8r deres returloop-omr\u00e5de s\u00e5 lille som muligt. Hvis det er n\u00f8dvendigt, skal du route dem manuelt f\u00f8rst, bruge sk\u00e6rme eller \u00f8ge afstanden for at beskytte signalkvaliteten.<br>b. Undg\u00e5 at placere interferensf\u00f8lsomme signaler, hvor EMC-milj\u00f8et er d\u00e5rligt, f.eks. mellem str\u00f8m- og jordplan.<br>c. For net, der kr\u00e6ver kontrolleret impedans, skal du f\u00f8lge reglerne for n\u00f8dvendig sporbredde og -l\u00e6ngde.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-b-four-common-trace-styles\">(B) Fire almindelige sporingsformer<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-1-clock-routing\">1. Clock-routing<\/h4>\n\n\n\n<p>Clock-traces er en af de st\u00f8rste kilder til EMC-problemer. Minim\u00e9r antallet af vias p\u00e5 clock-linjer. Undg\u00e5 at f\u00f8re clock-linjer parallelt med andre signaler. Hold dem adskilt fra almindelige signaler for at reducere interferens. Hold ogs\u00e5 clocklinjer v\u00e6k fra str\u00f8momr\u00e5der for at undg\u00e5 krydskobling mellem str\u00f8m og clock.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"673\" height=\"195\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Digital-clock-distribution.webp\" alt=\"Digital clock distribution\" class=\"wp-image-1407\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Digital-clock-distribution.webp 673w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Digital-clock-distribution-300x87.webp 300w\" sizes=\"(max-width: 673px) 100vw, 673px\" \/><\/figure>\n\n\n\n<p>Hvis der er en dedikeret urgeneratorchip p\u00e5 kortet, skal du ikke tr\u00e6kke spor under den. Fyld kobber under chippen, og sk\u00e6r om n\u00f8dvendigt et plan specielt til den. Mange chips bruger en referencekrystaloscillator. Lad v\u00e6re med at tr\u00e6kke spor under krystallen. Fyld kobber under krystallen for at isolere den.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-2-right-angle-traces\">2. Retvinklede spor<\/h4>\n\n\n\n<p>Retvinklede spor undg\u00e5s normalt i PCB-routing. De er et almindeligt m\u00e5l for routingkvalitet. En ret vinkel kan \u00e6ndre sporbredden effektivt. Denne \u00e6ndring for\u00e5rsager en impedansdiskontinuitet. Ikke kun rette vinkler, men ogs\u00e5 skarpe hj\u00f8rner og spidse vinkler kan \u00e6ndre impedansen.<\/p>\n\n\n\n<p>De vigtigste effekter af retvinklede hj\u00f8rner p\u00e5 signaler er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hj\u00f8rnet fungerer som en kapacitiv belastning p\u00e5 sporet. Det g\u00f8r stigetiden langsommere.<\/li>\n\n\n\n<li>Impedansdiskontinuitet kan for\u00e5rsage signalrefleksion.<\/li>\n\n\n\n<li>Den skarpe hj\u00f8rnespids kan generere EMI.<\/li>\n<\/ul>\n\n\n\n<p>S\u00e5 undg\u00e5 rette vinkler og skarpe hj\u00f8rner i h\u00f8jhastigheds- eller f\u00f8lsomme spor.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-3-differential-pairs\">3. Differentielle par<\/h4>\n\n\n\n<p>Se reference: <a href=\"https:\/\/www.altium.com\/documentation\/altium-designer\/pcb\/high-speed-design\/interactively-routing-differential-pairs?srsltid=AfmBOoqpWW2kGfSeWqKgsuwE9idPSB1GTAiAAVVbqhGQT0N0tRLo8zEp#viewing-and-managing-differential-pairs-on-the-pcb\">Altium Designer - Differentiel routing og impedanstilpasning<\/a>.<\/p>\n\n\n\n<p>Differentielle signaler bruges i vid udstr\u00e6kning i h\u00f8jhastighedskredsl\u00f8b. N\u00f8glesignalerne i mange designs bruger differentielle par. Enkelt sagt sender driveren to lige store og modsatte signaler. Modtageren afl\u00e6ser forskellen mellem de to sp\u00e6ndinger for at afg\u00f8re, om logikken er \u201c0\u201d eller \u201c1\u201d. De to spor, der b\u00e6rer et differentielt signal, er det differentielle par.<\/p>\n\n\n\n<p>Sammenlignet med single-ended spor har differentielle par klare fordele:<br>a. Bedre st\u00f8jimmunitet. De to spor er st\u00e6rkt sammenkoblede. Ekstern st\u00f8j kobles til begge spor p\u00e5 n\u00e6sten samme m\u00e5de. Modtageren ser p\u00e5 forskellen, s\u00e5 common-mode-st\u00f8j udlignes.<br>b. Lavere EMI. Fordi de to signaler er modsatrettede, oph\u00e6ver deres udstr\u00e5lede felter hinanden. Jo t\u00e6ttere de er, jo mere oph\u00e6ves felterne, og jo mindre energi udstr\u00e5les der.<br>c. Bedre timing-n\u00f8jagtighed. Switching edge er i krydsningspunktet mellem de to b\u00f8lgeformer. Det reducerer f\u00f8lsomheden over for proces og temperatur, s\u00e5 timing-fejlen er lavere. Differentialsignalering er god til signaler med lav amplitude. LVDS (Low Voltage Differential Signaling) er et eksempel p\u00e5 differentiel signalering med lille amplitude.<\/p>\n\n\n\n<p>For at f\u00e5 disse fordele ved routing f\u00f8lger PCB-ingeni\u00f8rer to hovedregler: \u201clige l\u00e6ngde og lige afstand\u201d.\u201d<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lige l\u00e6ngde holder de to signaler i modsat fase og reducerer common-mode-fejl.<\/li>\n\n\n\n<li>Lige stor afstand holder differentialimpedansen konstant og reducerer refleksioner.<br>Nogle gange bruges ogs\u00e5 reglen \u201chold parret t\u00e6t\u201d.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-4-serpentine-meander-traces\">4. Serpentinske (slyngede) spor<\/h4>\n\n\n\n<p>Serpentinspor bruges til at justere forsinkelse og opfylde timingkrav. Designere skal vide, at serpentinspor forringer signalkvaliteten og \u00e6ndrer transmissionsforsinkelsen. Pr\u00f8v at undg\u00e5 dem, n\u00e5r det er muligt. Men i praksis er serpentinerbaner ofte n\u00f8dvendige for at opfylde ops\u00e6tnings- og holdetid eller reducere sk\u00e6vhed i en signalgruppe.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"255\" height=\"207\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Serpentine-meander-traces.webp\" alt=\"Serpentine (meander) traces\" class=\"wp-image-1421\"\/><\/figure>\n\n\n\n<p>Noter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For differentielle par skal du k\u00f8re de to spor parallelt og minimere vias. Hvis du er n\u00f8dt til at bruge vias, s\u00e5 brug dem som par, s\u00e5 impedansen forbliver afbalanceret.<\/li>\n\n\n\n<li>Lad busbaner med samme funktion ligge side om side, og g\u00f8r dem s\u00e5 lige lange som muligt. Placer vias, der kommer fra SMT-pads, lidt v\u00e6k fra paden.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-c-common-routing-rules\">(C) F\u00e6lles regler for routing<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-1-direction-control\">1. Kontrol af retning<\/h4>\n\n\n\n<p>S\u00f8rg for, at spor p\u00e5 tilst\u00f8dende lag l\u00f8ber ortogonalt. Undg\u00e5 routing i samme retning p\u00e5 tilst\u00f8dende lag for at reducere krydstale fra lag til lag. Hvis du ikke kan undg\u00e5 routing i samme retning p\u00e5 grund af kortets struktur, skal du bruge et jordplan til at isolere lagene eller tilf\u00f8je jordede spor mellem signalsporene.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"363\" height=\"197\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Make-sure-traces-on-adjacent-layers-run-orthogonally.webp\" alt=\"Make sure traces on adjacent layers run orthogonally\" class=\"wp-image-1414\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Make-sure-traces-on-adjacent-layers-run-orthogonally.webp 363w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Make-sure-traces-on-adjacent-layers-run-orthogonally-300x163.webp 300w\" sizes=\"(max-width: 363px) 100vw, 363px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-2-open-loop-check\">2. Kontrol af \u00e5bent kredsl\u00f8b<\/h4>\n\n\n\n<p>Efterlad ikke ledninger med den ene ende flydende (dinglende). En h\u00e6ngende ledning kan fungere som en antenne og for\u00e5rsage u\u00f8nsket str\u00e5ling eller modtagelse.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"207\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Dangling-Line.png\" alt=\"Dangling Line\" class=\"wp-image-1404\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Dangling-Line.png 409w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Dangling-Line-300x152.png 300w\" sizes=\"(max-width: 409px) 100vw, 409px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-3-impedance-control\">3. Kontrol af impedans<\/h4>\n\n\n\n<p>Hold den samme linjebredde i det samme net. \u00c6ndringer i bredden \u00e6ndrer den karakteristiske impedans og kan for\u00e5rsage refleksion p\u00e5 h\u00f8jhastighedslinjer. Hvis du er n\u00f8dt til at \u00e6ndre bredden, skal du holde de inkonsekvente dele s\u00e5 korte som muligt.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"408\" height=\"180\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-the-same-line-width-in-the-same-net.webp\" alt=\"Keep the same line width in the same net\" class=\"wp-image-1412\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-the-same-line-width-in-the-same-net.webp 408w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-the-same-line-width-in-the-same-net-300x132.webp 300w\" sizes=\"(max-width: 408px) 100vw, 408px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-4-length-control\">4. Kontrol af l\u00e6ngde<\/h4>\n\n\n\n<p>Hold sporene korte for at reducere interferens fra lange spor. For vigtige linjer som ure skal oscillatoren placeres i n\u00e6rheden af den enhed, der bruger uret. For en driver, der driver mange enheder, skal du v\u00e6lge netv\u00e6rkstopologi efter systemets behov.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"129\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-traces-short-to-reduce-interference-from-long-traces.webp\" alt=\"Keep traces short to reduce interference from long traces\" class=\"wp-image-1413\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-traces-short-to-reduce-interference-from-long-traces.webp 472w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Keep-traces-short-to-reduce-interference-from-long-traces-300x82.webp 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-5-corner-rule\">5. Hj\u00f8rne-regel<\/h4>\n\n\n\n<p>Undg\u00e5 skarpe og retvinklede hj\u00f8rner for at reducere u\u00f8nsket str\u00e5ling og for at overholde produktionsgr\u00e6nserne.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"467\" height=\"129\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Corner-rule.webp\" alt=\"Corner rule\" class=\"wp-image-1403\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Corner-rule.webp 467w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Corner-rule-300x83.webp 300w\" sizes=\"(max-width: 467px) 100vw, 467px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-6-decoupling-rule\">6. Afkoblingsregel<\/h4>\n\n\n\n<p>A. Tilf\u00f8j de n\u00f8dvendige afkoblingskondensatorer p\u00e5 printet for at filtrere st\u00f8j p\u00e5 str\u00f8mskinnerne. Det hj\u00e6lper p\u00e5 str\u00f8mstabiliteten. P\u00e5 flerlagskort er den n\u00f8jagtige placering af afkoblingen mindre streng, men p\u00e5 dobbeltlagskort har layoutet og str\u00f8mf\u00f8ringen til afkoblingskapaciteter direkte indflydelse p\u00e5 systemets stabilitet og kan afg\u00f8re, om det bliver en succes eller en fiasko.B. P\u00e5 dobbeltlagskort skal str\u00f8mmen f\u00f8res gennem filterkapaciteter, f\u00f8r delene f\u00e5r str\u00f8m.C. I h\u00f8jhastighedsdesigns er korrekt afkobling afg\u00f8rende for kortets stabilitet.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"370\" height=\"163\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Decoupling-rule.webp\" alt=\"Decoupling rule\" class=\"wp-image-1406\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Decoupling-rule.webp 370w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Decoupling-rule-300x132.webp 300w\" sizes=\"(max-width: 370px) 100vw, 370px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-7-zoning-and-layering-rule\">7. Regel om zoneinddeling og lagdeling<\/h4>\n\n\n\n<p>A. Placer forskellige frekvensblokke adskilt for at undg\u00e5 gensidig interferens og for at afkorte h\u00f8jfrekvente stier. B. For kort med blandede signaler skal du placere analoge og digitale kredsl\u00f8b p\u00e5 separate sider eller omr\u00e5der og bruge et jordplan mellem routinglagene for at isolere dem.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"386\" height=\"213\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Zoning-and-layering-rule.webp\" alt=\"Zoning and layering rule\" class=\"wp-image-1424\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Zoning-and-layering-rule.webp 386w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Zoning-and-layering-rule-300x166.webp 300w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-8-ground-return-loop-rule\">8. Regel for returl\u00f8b til jord<\/h4>\n\n\n\n<p>Hold signalsporet og dets returloop-omr\u00e5de s\u00e5 lille som muligt. Mindre sl\u00f8jfer udstr\u00e5ler mindre og opfanger mindre interferens.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"382\" height=\"231\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Ground-return-loop-rule.webp\" alt=\"Ground return loop rule\" class=\"wp-image-1410\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Ground-return-loop-rule.webp 382w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Ground-return-loop-rule-300x181.webp 300w\" sizes=\"(max-width: 382px) 100vw, 382px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-9-power-and-plane-integrity\">9. Str\u00f8m- og planintegritet<\/h4>\n\n\n\n<p>I omr\u00e5der med mange vias skal man undg\u00e5 at lave huller, der sk\u00e6rer str\u00f8m- eller jordplaner i isolerede \u00f8er. Sk\u00e6ring af planer kan bryde planets integritet og \u00f8ge arealet af retursl\u00f8jfen. Det \u00f8ger st\u00f8j og udstr\u00e5ling.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"425\" height=\"173\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Power-and-plane-integrity.webp\" alt=\"Power and plane integrity\" class=\"wp-image-1418\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Power-and-plane-integrity.webp 425w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Power-and-plane-integrity-300x122.webp 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-10-3w-rule-for-spacing\">10. 3W-regel for afstand<\/h4>\n\n\n\n<p>For at reducere krydstale skal du holde afstanden mellem sporene p\u00e5 mindst 3 gange sporbredden (3W). Dette forhindrer ca. 70% af feltet i at blive koblet sammen. For at f\u00e5 ca. 98% isolering skal du bruge 10W afstand.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"423\" height=\"181\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/3W-rule-for-spacing.webp\" alt=\"3W rule for spacing\" class=\"wp-image-1399\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/3W-rule-for-spacing.webp 423w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/3W-rule-for-spacing-300x128.webp 300w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-11-shielding\">11. Afsk\u00e6rmning<\/h4>\n\n\n\n<p>For meget vigtige signaler som clocks eller synkroniseringslinjer skal du reducere loopomr\u00e5det ved at afsk\u00e6rme. Brug jordspor omkring signalet, eller brug afsk\u00e6rmede kobberkabler i ekstreme tilf\u00e6lde. S\u00f8rg for, at afsk\u00e6rmningen er godt forbundet med jordplanet.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"374\" height=\"195\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Shielding.webp\" alt=\"Shielding\" class=\"wp-image-1422\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Shielding.webp 374w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Shielding-300x156.webp 300w\" sizes=\"(max-width: 374px) 100vw, 374px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-12-termination-rules\">12. Regler for opsigelse<\/h4>\n\n\n\n<p>N\u00e5r sporforsinkelsen i digitale h\u00f8jhastighedskredsl\u00f8b er st\u00f8rre end en fjerdedel af signalets stigningstid, skal sporet behandles som en transmissionslinje. Match driverens indgangs- og udgangsimpedans til linjen. Der er mange matchningsordninger, og valget afh\u00e6nger af topologi og routing.A. For punkt-til-punkt-links (en driver, en modtager) skal du v\u00e6lge serieafslutning ved kilden eller parallelafslutning ved belastningen. Serieafslutning er enkel og billig, men kan tilf\u00f8je forsinkelse. Parallelafslutning passer godt, men er mere kompleks og dyr.B. For en driver til mange modtagere (punkt-til-multipunkt), hvis netv\u00e6rket er en daisy chain, skal du bruge parallelafslutning i slutningen. Hvis det er et stjernenetv\u00e6rk, skal du f\u00f8lge punkt-til-punkt-reglerne. Afvej omkostninger, str\u00f8mforbrug og ydeevne, n\u00e5r du v\u00e6lger. Fuldt match er ikke altid praktisk; begr\u00e6ns refleksioner til acceptable niveauer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"501\" height=\"333\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Termination-rules.webp\" alt=\"Termination rules\" class=\"wp-image-1423\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Termination-rules.webp 501w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Termination-rules-300x199.webp 300w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-13-closed-loop-checks\">13. Kontrol af lukket kredsl\u00f8b<\/h4>\n\n\n\n<p>Undg\u00e5, at signaler danner selvsl\u00f8jfer p\u00e5 tv\u00e6rs af lag. Kort med flere lag kan skabe selvsl\u00f8jfer, der for\u00e5rsager str\u00e5ling.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"567\" height=\"274\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Closed-loop-checks.webp\" alt=\"Closed-loop checks\" class=\"wp-image-1402\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Closed-loop-checks.webp 567w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Closed-loop-checks-300x145.webp 300w\" sizes=\"(max-width: 567px) 100vw, 567px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-14-branch-length-control\">14. Kontrol af grenl\u00e6ngde<\/h4>\n\n\n\n<p>Hold grenl\u00e6ngderne korte. Typisk regel: Tdelay \u2264 Trise \/ 20.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"461\" height=\"300\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Branch-length-control.webp\" alt=\"Branch length control\" class=\"wp-image-1401\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Branch-length-control.webp 461w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Branch-length-control-300x195.webp 300w\" sizes=\"(max-width: 461px) 100vw, 461px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-15-resonance-rule\">15. Resonans-regel<\/h4>\n\n\n\n<p>For h\u00f8jfrekvente signaler skal man undg\u00e5 sporl\u00e6ngder, der er heltallige multipla af signalets b\u00f8lgel\u00e6ngde, hvilket kan for\u00e5rsage resonans.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"633\" height=\"200\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Resonance-rule.webp\" alt=\"Resonance rule\" class=\"wp-image-1419\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Resonance-rule.webp 633w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Resonance-rule-300x95.webp 300w\" sizes=\"(max-width: 633px) 100vw, 633px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-16-isolated-copper-area-control\">16. Kontrol af isoleret kobberomr\u00e5de<\/h4>\n\n\n\n<p>Isolerede kobberomr\u00e5der kan for\u00e5rsage usikre problemer. Bind isoleret kobber til et jordnet eller fjern det for at forbedre signalkvaliteten. Nogle producenter tilf\u00f8jer kobber i tomme omr\u00e5der for at hj\u00e6lpe med fremstillingen og for at reducere kortets krumning.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"662\" height=\"262\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Isolated-copper-area-control.webp\" alt=\"Isolated copper area control\" class=\"wp-image-1411\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Isolated-copper-area-control.webp 662w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Isolated-copper-area-control-300x119.webp 300w\" sizes=\"(max-width: 662px) 100vw, 662px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-17-overlapping-power-plane-rule\">17. Regel om overlappende effektplan<\/h4>\n\n\n\n<p>Undg\u00e5 at overlappe forskellige str\u00f8mforsyninger i rummet. Det reducerer interferens mellem forsyninger med store sp\u00e6ndingsforskelle. Hvis overlapning ikke kan undg\u00e5s, kan du overveje at tilf\u00f8je et isoleret jordplan mellem dem.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"290\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Overlapping-power-plane-rule.webp\" alt=\"Overlapping power plane rule\" class=\"wp-image-1415\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Overlapping-power-plane-rule.webp 687w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Overlapping-power-plane-rule-300x127.webp 300w\" sizes=\"(max-width: 687px) 100vw, 687px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-18-20h-rule-for-edge-effect\">18. 20H-regel for kanteffekt<\/h4>\n\n\n\n<p>Det elektriske felt mellem str\u00f8m- og jordplan kan str\u00e5le ud p\u00e5 printkanten. For at reducere dette skal du krympe effektplanet indad fra printkanten. Hvis du krymper planet med 20 gange den dielektriske tykkelse (20H), kan du begr\u00e6nse ca. 70% af feltet inde i jordplanets kant. Krympning med 100H kan begr\u00e6nse ca. 98%.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"573\" height=\"160\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/20H-rule-for-edge-effect.webp\" alt=\"20H rule for edge effect\" class=\"wp-image-1400\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/20H-rule-for-edge-effect.webp 573w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/20H-rule-for-edge-effect-300x84.webp 300w\" sizes=\"(max-width: 573px) 100vw, 573px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-d-other-routing-notes\">(D) Andre routing-noter<\/h3>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-6c531013 wp-block-group-is-layout-flex\">\n<ul class=\"wp-block-list\">\n<li>Til enkelt- og dobbeltlagskort skal str\u00f8mskinnerne v\u00e6re brede og korte. En typisk regel: 1 mm sporbredde kan b\u00e6re ca. 1 A; brug dette til at dimensionere str\u00f8m- og jordspor. Hold omr\u00e5det med str\u00f8m-\/jordsl\u00f8jfer lille.<\/li>\n\n\n\n<li>Hvis et str\u00f8mspor er langt, kan dets koblede st\u00f8j g\u00e5 direkte ind i belastningen. Afkobl str\u00f8mmen til hver belastning f\u00f8r belastningens indgang. Brug uafh\u00e6ngig afkobling for hver belastning, og filtrer skinnen, f\u00f8r den kommer ind i belastningen, for at reducere gensidig interferens.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"621\" height=\"373\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/For-single-and-double-layer-boards.webp\" alt=\"For single- and double-layer boards\" class=\"wp-image-1408\" style=\"width:371px;height:auto\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/For-single-and-double-layer-boards.webp 621w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/For-single-and-double-layer-boards-300x180.webp 300w\" sizes=\"(max-width: 621px) 100vw, 621px\" \/><\/figure>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"589\" height=\"531\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Good-grounding-should-be-maintained-during-routing.webp\" alt=\"Good grounding should be maintained during routing\" class=\"wp-image-1409\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Good-grounding-should-be-maintained-during-routing.webp 589w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/Good-grounding-should-be-maintained-during-routing-300x270.webp 300w\" sizes=\"(max-width: 589px) 100vw, 589px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-ddr-routing-rules\">3. Regler for DDR-routing<\/h2>\n\n\n\n<p>Se referencer: DDR routing rules and process; DDR2-800 and DDR3 signal integrity design; DDR2 routing rules parts one and two.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"656\" height=\"642\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/DDR2-Packing-and-pinout-details.webp\" alt=\"DDR2 Packing and pinout details\" class=\"wp-image-1405\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/DDR2-Packing-and-pinout-details.webp 656w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/DDR2-Packing-and-pinout-details-300x294.webp 300w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-understand-ddr2-signals-first\">(A) Forst\u00e5 DDR2-signaler f\u00f8rst<\/h3>\n\n\n\n<p>Eksempel brugt her: DDR2-chip MT47H64M16HG.<\/p>\n\n\n\n<p>Detaljer om indpakning og pinout (indpakning, pin-definitioner og skemaer) er vigtige for layout og routing. Kend signalgrupperne: datalinjer og adresselinjer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"713\" height=\"783\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-1.webp\" alt=\"pin definitions 1\" class=\"wp-image-1416\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-1.webp 713w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-1-273x300.webp 273w\" sizes=\"(max-width: 713px) 100vw, 713px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"711\" height=\"588\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-2.webp\" alt=\"pin definitions 2\" class=\"wp-image-1417\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-2.webp 711w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/pin-definitions-2-300x248.webp 300w\" sizes=\"(max-width: 711px) 100vw, 711px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-signal-groups\">Signalgrupper<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data: DQ[0-15], DQS, DM og klokkesl\u00e6t CK\/CK#.<\/li>\n\n\n\n<li>Adresse: A[0-15], BA[0-2] og kontrolsignaler CS, WE, RAS, CAS. Ogs\u00e5 CKE og ODT.<\/li>\n<\/ul>\n\n\n\n<p>For DDR-routing skal du f\u00f8lge de specifikke regler, der passer til chippen og hukommelsessystemets topologi. Nogle generelle DDR-routingpunkter er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hold data strobes (DQS) t\u00e6t p\u00e5 data (DQ). Bind timingen, s\u00e5 DQS m\u00f8der setup og hold ved hver modtager.<\/li>\n\n\n\n<li>Ved punkt-til-punkt- eller fly-by-routing af adresse- og kommandolinjer skal man v\u00e6lge den topologi, som hukommelsesleverand\u00f8ren anbefaler. Fly-by-routing kr\u00e6ver ofte terminering n\u00e6r enden af linjen.<\/li>\n\n\n\n<li>F\u00f8r adresse- og kommandospor med kontrolleret impedans og tilpassede l\u00e6ngder, hvor det er n\u00f8dvendigt.<\/li>\n\n\n\n<li>Ved multibit-busser skal der v\u00e6re matchende l\u00e6ngder i hver gruppe. Hold grupperne adskilt efter funktion.<\/li>\n\n\n\n<li>Undg\u00e5 stubbe, og brug korrekt afslutning for at reducere refleksioner.<\/li>\n\n\n\n<li>Hold str\u00f8m- og jordplaner kontinuerlige, og placer afkoblingen t\u00e6t p\u00e5 hukommelsens og controllerens str\u00f8mstifter.<\/li>\n\n\n\n<li>Placer hukommelseschip og controller, s\u00e5 de kritiske h\u00f8jhastighedsstier er korte og har minimale lagovergange.<\/li>\n<\/ul>\n\n\n\n<p>(For mere pr\u00e6cise valg af DDR-layout skal du f\u00f8lge hukommelsesleverand\u00f8rens applikationsnoter og kortets signalintegritetsanalyse).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"619\" height=\"1024\" src=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/schematics-619x1024.webp\" alt=\"schematics\" class=\"wp-image-1420\" srcset=\"https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/schematics-619x1024.webp 619w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/schematics-181x300.webp 181w, https:\/\/fljpcb.com\/wp-content\/uploads\/2025\/12\/schematics.webp 698w\" sizes=\"(max-width: 619px) 100vw, 619px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-closing-notes\">4. Afsluttende noter<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tjek altid dit layout med skemaet og blokdiagrammet. Placer de vigtigste dele f\u00f8rst. F\u00f8r derefter kritiske signaler. G\u00f8r derefter den \u00f8vrige routing f\u00e6rdig.<\/li>\n\n\n\n<li>Ved h\u00f8jhastigheds- og mixed-signal-design skal du planl\u00e6gge lagopbygning, planplacering og returveje tidligt. Brug kontrolleret impedans og signalisolering, hvor det er n\u00f8dvendigt.<\/li>\n\n\n\n<li>Brug de grundl\u00e6ggende regler: korte sl\u00f8jfer, afstemte l\u00e6ngder for kritiske grupper, stabil str\u00f8m og god afkobling. Disse regler forbedrer signalkvaliteten og reducerer EMI.<\/li>\n\n\n\n<li>Hvis du er i tvivl, skal du f\u00f8lge leverand\u00f8rens applikationsnoter for DDR, h\u00f8jhastighedstransceivere og s\u00e6rlige gr\u00e6nseflader.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>1. Layout Component placement \u2014 ten rules 2. Routing (Traces) (A) Routing priority Notes:a. Give clock, high-speed, and sensitive signals dedicated routing layers when you can. Make their return loop area as small as possible. If needed, route these by hand first, use shields, or increase clearance to protect signal quality.b. Avoid placing interference-sensitive signals [&hellip;]<\/p>","protected":false},"author":1,"featured_media":1426,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,47],"tags":[46,43,41,42,45,40,44],"class_list":["post-1398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-design","category-pcb-layout","tag-electronic-design","tag-emi-reduction","tag-grounding","tag-pcb-design","tag-pcb-layout-tips","tag-pcb-routing","tag-signal-integrity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>PCB Grounding Guide: Essential Rules for Clean Routing - Philifast - Fast PCB &amp; PCBA Manufacturer<\/title>\n<meta name=\"description\" content=\"Proper PCB grounding reduces noise and improves signal integrity. 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