{"id":4809,"date":"2026-03-16T09:56:36","date_gmt":"2026-03-16T09:56:36","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4809"},"modified":"2026-03-16T09:57:49","modified_gmt":"2026-03-16T09:57:49","slug":"pcb-layer-planning-guide-for-multilayer-pcb-design","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/pcb-layer-planning-guide-for-multilayer-pcb-design\/","title":{"rendered":"PCB-lagplanl\u00e6gningsguide til PCB-design i flere lag"},"content":{"rendered":"

I. Oversigt over bestemmelse af antal PCB-lag<\/h1>\n\n\n\n

Det samlede antal PCB-lag er ikke fastlagt fra starten. Ingeni\u00f8rerne beslutter antallet af lag ud fra printkortets behov. Det samlede antal lag kommer fra antallet af signallag plus antallet af str\u00f8m- og jordplaner. Ingeni\u00f8rerne ser p\u00e5 kortets layout, komponenttyper og elektriske behov. Derefter planl\u00e6gger de, hvor mange signallag der er brug for, og hvor mange str\u00f8m-\/jordlag der er brug for. Planen har til form\u00e5l at g\u00f8re routing let, kontrollere signalkvaliteten og overholde omkostningsgr\u00e6nserne.<\/p>\n\n\n\n

II. Planl\u00e6gning af str\u00f8m- og jordlag<\/h1>\n\n\n\n

A. Hvordan v\u00e6lger man antallet af effektlag?<\/h2>\n\n\n\n

Antallet af str\u00f8mplaner bestemmes hovedsageligt af disse punkter: hvor mange forskellige str\u00f8mskinner kortet har brug for, hvordan disse skinner er fordelt p\u00e5 kortet, hvor meget str\u00f8m hver skinne skal b\u00e6re, hvad kortets pr\u00e6stationsm\u00e5l er, og omkostningsgr\u00e6nserne for et enkelt kort. Du v\u00e6lger antallet af str\u00f8mskinner, s\u00e5 hver st\u00f8rre str\u00f8mskinne har en ordentlig str\u00f8mskinne eller et veldefineret str\u00f8mskinneomr\u00e5de. Du skal ogs\u00e5 s\u00f8rge for, at str\u00f8mforsyningerne ikke overlapper hinanden p\u00e5 en m\u00e5de, der for\u00e5rsager krydstale eller skaber delte str\u00f8mforsyninger, der skader ydeevnen.<\/p>\n\n\n\n

Der er to vigtige regler for power plane-layout:<\/p>\n\n\n\n

Str\u00f8mnet b\u00f8r ikke blandes p\u00e5 samme plan p\u00e5 en m\u00e5de, der for\u00e5rsager interferens. Kort sagt, undg\u00e5 str\u00f8mnet, der er sammenflettet p\u00e5 et fysisk plan.<\/p>\n\n\n\n

Undg\u00e5 at f\u00f8re vigtige signaler p\u00e5 tv\u00e6rs af splits i tilst\u00f8dende planer. Hvis et signal skal krydse en opdeling, kan signalets referenceplan blive brudt. Det bryder returstr\u00f8msvejene og skader signalintegriteten. S\u00e5 arranger planestakke, s\u00e5 vigtige signaler ikke krydser splits.<\/p>\n\n\n\n

B. Hvordan v\u00e6lger man antallet af jordlag?<\/h2>\n\n\n\n

N\u00e5r du l\u00e6gger jordlag, skal du v\u00e6re opm\u00e6rksom p\u00e5 disse punkter:<\/p>\n\n\n\n

Laget lige under hovedkomponentens side b\u00f8r have et stort set kontinuerligt jordplan. Det hj\u00e6lper med at returnere str\u00f8m og reducerer st\u00f8j for dele p\u00e5 oversiden.<\/p>\n\n\n\n

H\u00f8jhastighedssignaler, h\u00f8jfrekvente net og clocknet skal referere til et solidt jordplan. Deres returstr\u00f8m flyder p\u00e5 det plan. Hvis planet er brudt, f\u00e5r signalerne st\u00f8j og EMI.<\/p>\n\n\n\n

St\u00f8rre effektplaner og jordplaner skal v\u00e6re t\u00e6t og godt koblet. T\u00e6t kobling s\u00e6nker planets impedans og hj\u00e6lper p\u00e5 str\u00f8mintegriteten. Lav impedans hj\u00e6lper med at holde krusninger nede og giver stabil str\u00f8m til IC'er.<\/p>\n\n\n\n

I praksis vil et design med mange hurtige net have brug for flere jordplaner eller i det mindste et par str\u00f8m- og jordplaner t\u00e6t p\u00e5 hinanden. Det giver bedre afkobling og lettere kontrol med impedansen.<\/p>\n\n\n\n

III. Planl\u00e6gning af antallet af signallag<\/h1>\n\n\n\n

A. Routing-kanaler og hvorfor de er vigtige<\/h2>\n\n\n\n

Routingkanaler afg\u00f8r ofte, hvor mange signallag du har brug for. Start med at kigge efter dybe BGA'er eller store stik p\u00e5 kortet. BGA-dybden og BGA-pin-pitch er afg\u00f8rende for, hvor mange flugtlag du har brug for. For eksempel tillader en BGA med 1,0 mm pitch ofte to spor mellem to vias. En BGA med 0,8 mm pitch tillader ofte kun et spor mellem to vias. Den forskel \u00e6ndrer, hvor mange routinglag du skal have.<\/p>\n\n\n\n

Hvis en BGA tillader to spor mellem to vias, kan BGA escape dele to routinglag. Hvis en BGA kun tillader \u00e9t spor mellem to vias, kan escapen have brug for op til fire routinglag for at f\u00f8re alle net ud. Derfor er BGA-pitch og fanout-geometri centrale for lagplanl\u00e6gningen.<\/p>\n\n\n\n

Stik er anderledes. For stik er den vigtigste faktor dybde og pinafstand. Mellem to connector-vias skal du typisk route et differentielt par. Den tommelfingerregel hj\u00e6lper dig med at estimere, hvor mange kanaler du har brug for til stikregioner.<\/p>\n\n\n\n

B. H\u00f8jhastighedsnet og behov for routingkanaler<\/h2>\n\n\n\n

Dern\u00e6st skal du overveje h\u00f8j hastighed<\/a> signaler. H\u00f8jhastighedsrouting kr\u00e6ver flere forhold. Du skal t\u00e6nke p\u00e5 stubbe, sporafstand og referenceplaner. H\u00f8jhastighedsnet er f\u00f8lsomme over for impedansstyring og returstr\u00f8m. S\u00e5 tjek, om routingkanalerne til disse net er brede og klare nok.<\/p>\n\n\n\n

N\u00e5r du planl\u00e6gger, skal du identificere, hvilke net der er h\u00f8jhastighedsnet. Giv dem prioritet i routingen. Reserver kanaler, der tillader ordentlig afstand og kontrolleret impedans. Husk ogs\u00e5 p\u00e5 differentielle par. Differentielle linjer har brug for matchende l\u00e6ngder og t\u00e6t kobling til deres reference. For h\u00f8jhastighedspar skal du holde konsekvent afstand til referenceplanet og holde parrene v\u00e6k fra st\u00f8jende net.<\/p>\n\n\n\n

C. Sn\u00e6vre omr\u00e5der eller flaskehalse<\/h2>\n\n\n\n

Til sidst skal du planl\u00e6gge flaskehalsomr\u00e5der p\u00e5 tavlen. Efter grundl\u00e6ggende placering og global routing-planl\u00e6gning skal du finde smalle omr\u00e5der, hvor mange net skal passere et lille hul. Det er de s\u00e5kaldte choke points. For hver flaskehals skal du t\u00e6lle antallet af n\u00f8dvendige spor, differentielle par og f\u00f8lsomme net. Beslut derefter, hvor mange lag der skal til, for at alle n\u00f8dvendige linjer kan passere gennem dette omr\u00e5de.<\/p>\n\n\n\n

G\u00f8r det trin for trin:<\/p>\n\n\n\n

Marker flaskehalsomr\u00e5det.<\/p>\n\n\n\n

Angiv alle net, der skal passere gennem den.<\/p>\n\n\n\n

Medtag differentielle par og kritiske signaler p\u00e5 listen.<\/p>\n\n\n\n

Beregn antallet af spor, der passer til hvert routinglag i det mellemrum.<\/p>\n\n\n\n

Gang med antallet af routinglag, som du kan bruge til det omr\u00e5de.<\/p>\n\n\n\n

Dette giver det samlede antal spor, der kan g\u00e5 igennem. Hvis dette antal er mindre end antallet af n\u00f8dvendige net, skal du tilf\u00f8je routinglag eller \u00e6ndre placeringen for at reducere overbelastningen.<\/p>\n\n\n\n

IV. Eksempler og enkle tommelfingerregler<\/h1>\n\n\n\n

A. Eksempler p\u00e5 BGA-flugt<\/h2>\n\n\n\n

Hvis du kan route to spor mellem to vias p\u00e5 en BGA, kan du ofte bruge to routinglag til BGA-flugten. Dette er et almindeligt tilf\u00e6lde for BGA-pakker med 1,0 mm pitch.<\/p>\n\n\n\n

Hvis du kun kan route en bane mellem to vias, skal du m\u00e5ske bruge fire routinglag for at route alle BGA-stifter. Det sker ofte med BGA'er med mindre pitch, f.eks. 0,8 mm.<\/p>\n\n\n\n

B. Eksempel p\u00e5 placering af stik<\/h2>\n\n\n\n

For mange stik skal du antage, at du kan route et differentielt par pr. to vias. Brug dette til at dimensionere routingkanalerne n\u00e6r stikket. Hvis stikket har mange baner, skal du bruge flere routinglag eller et andet stikfodaftryk.<\/p>\n\n\n\n

C. Eksempel p\u00e5 h\u00f8jhastighedssignal<\/h2>\n\n\n\n

For et MIPI- eller USB-differentielt par skal du holde parret t\u00e6t p\u00e5 dets referenceplan og holde parafstanden og sporbredden korrekt i forhold til m\u00e5limpedansen. Hvis routingkanalen er smal, kan det v\u00e6re n\u00f8dvendigt med flere lag for at holde layoutet rent og opfylde impedansm\u00e5lene.<\/p>\n\n\n\n

V. Mere om planl\u00e6gning af signalintegritet og fremstillingsevne<\/h1>\n\n\n\n

A. Hold returvejen kort og lokal<\/h2>\n\n\n\n

Planl\u00e6g altid signallagene, s\u00e5 returstr\u00f8mmen kan flyde p\u00e5 et jordplan i n\u00e6rheden. N\u00e5r et signallag ligger ved siden af et jordplan, er returvejen kort, og EMI er lav. Hvis du placerer et signallag mellem to blandede planer eller i n\u00e6rheden af et delt plan, er returvejen ikke lokal. Det giver mere EMI og kan skade signalintegriteten.<\/p>\n\n\n\n

B. Hold \u00f8je med splitplaner og s\u00f8mme<\/h2>\n\n\n\n

Hvis du er n\u00f8dt til at splitte et plan, skal du dirigere f\u00f8lsomme signaler, s\u00e5 de ikke krydser splittet. Hvis et h\u00f8jhastighedsnet skal krydse en planopdeling, skal du s\u00f8rge for en tydelig returvia eller syning for at holde returvejen konsistent. Brug via-syninger og ground-vias n\u00e6r splitkanterne for at reducere loop-omr\u00e5det.<\/p>\n\n\n\n

C. Hold str\u00f8m\/jord-par t\u00e6t p\u00e5 hinanden i opstillingen<\/h2>\n\n\n\n

N\u00e5r du placerer et effektplan ved siden af et jordplan, danner parret en kondensator. Det hj\u00e6lper med at afkoble str\u00f8mmen og reducere planets impedans. Det er meget nyttigt for str\u00f8mintegriteten. Hvis du har flere str\u00f8mskinner, skal du pr\u00f8ve at gruppere dem i parvise stakke eller kun bruge delte planer, n\u00e5r du kontrollerer routing for at undg\u00e5 lange returveje.<\/p>\n\n\n\n

D. Overvej regler for producerbarhed tidligt<\/h2>\n\n\n\n

Indstil DFM-gr\u00e6nser fra starten. Angiv mindste sporbredde, mindste sporafstand, mindste ringformede ring og mindste borest\u00f8rrelse. Match dine designregler med, hvad fabrikken kan lave p\u00e5 en p\u00e5lidelig m\u00e5de. Hvis du planl\u00e6gger meget tynde spor eller meget sm\u00e5 vias, skal du tjekke, om leverand\u00f8ren kan h\u00e5ndtere dem, og hvordan omkostningerne vil \u00e6ndre sig.<\/p>\n\n\n\n

VI. Flaskehalsberegningen i flere detaljer<\/h1>\n\n\n\n

A. S\u00e5dan t\u00e6ller du baner i et hul<\/h2>\n\n\n\n

M\u00e5l bredden p\u00e5 mellemrummet i flaskehalsomr\u00e5det.<\/p>\n\n\n\n

Brug din planlagte sporbredde og -afstand til at beregne, hvor mange single-ended-spor der passer i et lag. For differentielle par skal du t\u00e6lle, hvor mange par der er plads til baseret p\u00e5 parafstanden.<\/p>\n\n\n\n

Tag h\u00f8jde for sp\u00e6rreomr\u00e5der og vias, der blokerer spor. Reducer den anvendelige bredde med den plads, der optages af via-felter eller mekaniske huller.<\/p>\n\n\n\n

B. Bestem antallet af lag ud fra mellemrumskapaciteten<\/h2>\n\n\n\n

Hvis et lag kan b\u00e6re de n\u00f8dvendige spor, er det fint.<\/p>\n\n\n\n

Hvis ikke, skal du tilf\u00f8je et andet routinglag og tjekke igen.<\/p>\n\n\n\n

Hvis det ikke er muligt at tilf\u00f8je lag, kan man overveje at flytte dele, skifte stik eller \u00e6ndre BGA-fanout-strategien.<\/p>\n\n\n\n

VII. At s\u00e6tte det hele sammen - praktisk flow for lagplanl\u00e6gning<\/h1>\n\n\n\n

Trin 1. Lav en liste over begr\u00e6nsninger og m\u00e5l<\/p>\n\n\n\n

Lav en kort liste: antal BGA'er og deres pitch, antal stik, antal h\u00f8jhastighedsnet, liste over str\u00f8mskinner, pr\u00e6stationsm\u00e5l og omkostningsm\u00e5l.<\/p>\n\n\n\n

Trin 2. Skits\u00e9r en forel\u00f8big opstilling<\/p>\n\n\n\n

Start med de n\u00f8dvendige str\u00f8m- og jordlag n\u00e6r midten. L\u00e6g signallag omkring dem. Brug par af str\u00f8m\/jord, hvor du har brug for lav impedans.<\/p>\n\n\n\n

Trin 3. Tjek behov for BGA-flugt<\/p>\n\n\n\n

Tjek hver enkelt BGA. Hvis du har brug for flere flugtbaner, skal du tilf\u00f8je signallag eller \u00e6ndre BGA'ens fodaftryk.<\/p>\n\n\n\n

Trin 4. Tjek h\u00f8jhastigheds-routingkanaler<\/p>\n\n\n\n

Marker alle h\u00f8jhastighedsnet. Reserver routingkanaler til dem. Hvis kanalerne er trange, skal du tilf\u00f8je lag eller \u00e6ndre placering.<\/p>\n\n\n\n

Trin 5. Tjek flaskehalse<\/p>\n\n\n\n

T\u00e6l kapaciteten i hvert smalt hul. Hvis kapaciteten ikke er tilstr\u00e6kkelig, skal du tilf\u00f8je lag eller flytte ting.<\/p>\n\n\n\n

Trin 6. F\u00e6rdigg\u00f8r opstilling og regler<\/p>\n\n\n\n

Fiks opstabling. Indstil sporbredder, mellemrum og impedansm\u00e5l. S\u00f8rg for, at designet f\u00f8lger DFM.<\/p>\n\n\n\n

Trin 7. Valider med ingeni\u00f8rer og fabrikant<\/p>\n\n\n\n

Gennemg\u00e5 stack-up'en med PCB-fabrikanten og med signalintegritetsingeni\u00f8rer. Bed om tidlige kommentarer og justeringer.<\/p>\n\n\n\n

VIII. Kort opsummering<\/h1>\n\n\n\n

Lagplanl\u00e6gning er en blanding af elektriske behov og praktisk routing. Du planl\u00e6gger str\u00f8m- og jordlag, s\u00e5 str\u00f8mmen er stabil, og returvejene er korte. Man planl\u00e6gger signallag ud fra routingkanaler, BGA-pitch, stikdybde og flaskehalsomr\u00e5der. Hvis du planl\u00e6gger godt, bliver routing lettere og mere p\u00e5lidelig. PCB-design er lidt ligesom at bygge en h\u00f8j bygning. Lagplanen er tegningen. Hvis tegningen er korrekt, g\u00e5r byggeriet glat.<\/p>\n\n\n

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\tHvordan bestemmes antallet af PCB-lag?<\/span><\/div>

Antallet af PCB-lag bestemmes af antallet af signallag og antallet af str\u00f8m- og jordplaner, der kr\u00e6ves til kredsl\u00f8bet. Ingeni\u00f8rer vurderer komponentt\u00e6thed, routingkompleksitet, BGA-pitch, h\u00f8jhastighedssignaler og behov for str\u00f8mfordeling, f\u00f8r de beslutter det endelige antal lag.<\/p><\/div><\/div>

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\tHvorfor er jordplaner vigtige i PCB-design?<\/span><\/div>

Jordplaner giver en stabil reference for signaler og hj\u00e6lper med at reducere elektromagnetisk interferens. Et kontinuerligt jordplan forbedrer ogs\u00e5 signalintegriteten og giver en klar returvej for h\u00f8jhastighedssignaler.<\/p><\/div><\/div>

\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\tHvordan p\u00e5virker BGA'er planl\u00e6gningen af PCB-lag?<\/span><\/div>

BGA'er har t\u00e6tte pin-layouts. BGA'ens pitch bestemmer, hvor mange spor der kan passere mellem vias. En st\u00f8rre pitch giver mulighed for flere routingkanaler, mens en mindre pitch kr\u00e6ver flere routinglag for at fuldf\u00f8re routing af signalflugt.<\/p><\/div><\/div><\/div>\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

I. Overview of PCB Layer Count Determination The total number of PCB layers is not fixed at the start. Engineers 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