{"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\/fi\/pcb-layer-planning-guide-for-multilayer-pcb-design\/","title":{"rendered":"PCB-kerroksen suunnitteluopas monikerroksisen PCB-suunnittelun suunnitteluun"},"content":{"rendered":"

I. Yleiskatsaus PCB-kerrosten lukum\u00e4\u00e4r\u00e4n m\u00e4\u00e4ritt\u00e4miseen<\/h1>\n\n\n\n

Piirilevykerrosten kokonaism\u00e4\u00e4r\u00e4\u00e4 ei ole vahvistettu alussa. Insin\u00f6\u00f6rit p\u00e4\u00e4tt\u00e4v\u00e4t kerrosten m\u00e4\u00e4r\u00e4n levyn tarpeiden perusteella. Kokonaiskerrosten m\u00e4\u00e4r\u00e4 saadaan signaalikerrosten m\u00e4\u00e4r\u00e4st\u00e4 sek\u00e4 virta- ja maatasojen m\u00e4\u00e4r\u00e4st\u00e4. Insin\u00f6\u00f6rit tarkastelevat piirilevyn asettelua, komponenttityyppej\u00e4 ja s\u00e4hk\u00f6isi\u00e4 tarpeita. Sen j\u00e4lkeen he suunnittelevat, kuinka monta signaalikerrosta tarvitaan ja kuinka monta virta- ja maakerrosta. Suunnitelman tavoitteena on tehd\u00e4 reitityksest\u00e4 helppoa, valvoa signaalin laatua ja noudattaa kustannusrajoja.<\/p>\n\n\n\n

II. Teho- ja maakerrosten suunnittelu<\/h1>\n\n\n\n

A. Kuinka valita tehokerrosten m\u00e4\u00e4r\u00e4<\/h2>\n\n\n\n

Virtatasojen m\u00e4\u00e4r\u00e4 m\u00e4\u00e4r\u00e4ytyy p\u00e4\u00e4asiassa seuraavien seikkojen perusteella: kuinka monta eri virtakiskoa levy tarvitsee, miten n\u00e4m\u00e4 kiskot on jaettu levylle, kuinka paljon virtaa kunkin kiskon on kuljetettava, mitk\u00e4 ovat levyn suorituskykytavoitteet ja yhden levyn kustannusrajat. Virransy\u00f6tt\u00f6tasojen m\u00e4\u00e4r\u00e4 valitaan siten, ett\u00e4 jokaisella t\u00e4rkeimm\u00e4ll\u00e4 virtakiskolla on oma tasonsa tai hyvin m\u00e4\u00e4ritelty tasojen alue. Sinun on my\u00f6s varmistettava, ett\u00e4 virtatasot eiv\u00e4t ole p\u00e4\u00e4llekk\u00e4isi\u00e4 siten, ett\u00e4 ne aiheuttavat ristikk\u00e4isviestint\u00e4\u00e4 tai jakavat tasoja, jotka haittaavat suorituskyky\u00e4.<\/p>\n\n\n\n

Tehotasojen asettelussa on kaksi t\u00e4rke\u00e4\u00e4 s\u00e4\u00e4nt\u00f6\u00e4:<\/p>\n\n\n\n

Tehoverkkoja ei saa sekoittaa samalle tasolle siten, ett\u00e4 ne aiheuttavat h\u00e4iri\u00f6it\u00e4. Lyhyesti sanottuna, v\u00e4lt\u00e4 tehoverkkoja, jotka on lomitettu yhteen fyysiseen tasoon.<\/p>\n\n\n\n

V\u00e4lt\u00e4 t\u00e4rkeiden signaalien kulkua viereisten tasojen jakojen yli. Jos signaalin on ylitett\u00e4v\u00e4 jako, signaalin vertailutaso voi rikkoutua. T\u00e4m\u00e4 rikkoo paluuvirtapolut ja vahingoittaa signaalin eheytt\u00e4. J\u00e4rjest\u00e4 siis tasopinot niin, ett\u00e4 t\u00e4rke\u00e4t signaalit eiv\u00e4t ylit\u00e4 jakoja.<\/p>\n\n\n\n

B. Miten valita maakerrosten m\u00e4\u00e4r\u00e4<\/h2>\n\n\n\n

Kun asetat maakerroksia, kiinnit\u00e4 huomiota n\u00e4ihin seikkoihin:<\/p>\n\n\n\n

Aivan p\u00e4\u00e4komponentin alapuolella olevassa kerroksessa pit\u00e4isi olla enimm\u00e4kseen yhten\u00e4inen maataso. T\u00e4m\u00e4 auttaa palauttamaan virtaa ja v\u00e4hent\u00e4\u00e4 kohinaa yl\u00e4puolella olevien osien osalta.<\/p>\n\n\n\n

Suurnopeussignaalien, suurtaajuusverkkojen ja kelloverkkojen on viitattava kiinte\u00e4\u00e4n maatasoon. Niiden paluuvirta kulkee t\u00e4ll\u00e4 tasolla. Jos taso rikkoutuu, signaalit saavat kohinaa ja s\u00e4hk\u00f6magneettisia h\u00e4iri\u00f6it\u00e4.<\/p>\n\n\n\n

Suurten tehotasojen ja maatasojen on oltava l\u00e4hekk\u00e4in ja hyvin kytkettyj\u00e4. Tiivis kytkent\u00e4 alentaa tason impedanssia ja auttaa tehon eheytt\u00e4. Alhainen impedanssi auttaa pit\u00e4m\u00e4\u00e4n aaltoilun alhaalla ja antaa IC:lle vakaan virran.<\/p>\n\n\n\n

K\u00e4yt\u00e4nn\u00f6ss\u00e4 suunnittelu, jossa on paljon nopeita verkkoja, tarvitsee useampia maatasoja tai ainakin pari teho- ja maatasoja l\u00e4hell\u00e4 toisiaan. N\u00e4in saadaan parempi irrotus ja impedanssin hallinta on helpompaa.<\/p>\n\n\n\n

III. Signaalikerrosten m\u00e4\u00e4r\u00e4n suunnittelu<\/h1>\n\n\n\n

A. Reitityskanavat ja niiden merkitys<\/h2>\n\n\n\n

Reitityskanavat m\u00e4\u00e4r\u00e4\u00e4v\u00e4t usein, kuinka monta signaalikerrosta tarvitaan. Aloita etsim\u00e4ll\u00e4 levyst\u00e4 syvi\u00e4 BGA-kortteja tai suuria liittimi\u00e4. BGA:n syvyys ja BGA-nastojen jako ovat avainasemassa sen suhteen, kuinka monta pakokerrosta tarvitset. Esimerkiksi 1,0 mm:n BGA-piikkiv\u00e4li sallii usein kaksi j\u00e4lke\u00e4 kahden l\u00e4piviennin v\u00e4liss\u00e4. BGA, jossa on 0,8 mm:n jako, sallii usein vain yhden j\u00e4ljen kahden l\u00e4piviennin v\u00e4liss\u00e4. T\u00e4m\u00e4 ero muuttaa sit\u00e4, kuinka monta reitityskerrosta on oltava.<\/p>\n\n\n\n

Jos BGA-piirilevyll\u00e4 on kaksi j\u00e4lke\u00e4 kahden l\u00e4piviennin v\u00e4liss\u00e4, BGA-piirilevy voi jakaa kaksi reitityskerrosta. Jos BGA sallii vain yhden j\u00e4ljen kahden l\u00e4piviennin v\u00e4liss\u00e4, pako voi tarvita jopa nelj\u00e4 reitityskerrosta kaikkien verkkojen reititt\u00e4miseen. N\u00e4in ollen BGA:n pitch ja fanout-geometria ovat keskeisess\u00e4 asemassa kerrosten suunnittelussa.<\/p>\n\n\n\n

Liittimet ovat erilaisia. Liittimiss\u00e4 t\u00e4rkein tekij\u00e4 on syvyys ja nastojen v\u00e4li. Tyypillisesti kahden liittimen l\u00e4pivientien v\u00e4liin reititet\u00e4\u00e4n yksi differentiaalipari. T\u00e4m\u00e4 nyrkkis\u00e4\u00e4nt\u00f6 auttaa sinua arvioimaan, kuinka monta kanavaa tarvitset liitinalueille.<\/p>\n\n\n\n

B. Suurnopeusverkot ja reitityskanavatarpeet<\/h2>\n\n\n\n

Harkitse seuraavaksi nopea<\/a> signaaleja. Suurnopeusreititys vaatii enemm\u00e4n ehtoja. Sinun on mietitt\u00e4v\u00e4 niputuksia, j\u00e4lkien v\u00e4lej\u00e4 ja vertailutasoja. Suurnopeusverkot ovat herkki\u00e4 impedanssin ohjaukselle ja paluuvirralle. Tarkista siis, ovatko n\u00e4iden verkkojen reitityskanavat riitt\u00e4v\u00e4n leveit\u00e4 ja selkeit\u00e4.<\/p>\n\n\n\n

Suunnittelun yhteydess\u00e4 on selvitett\u00e4v\u00e4, mitk\u00e4 verkot ovat suurnopeusverkkoja. Aseta ne etusijalle reitityksess\u00e4. Varaa kanavat, jotka mahdollistavat asianmukaisen et\u00e4isyyden ja hallitun impedanssin. Muista my\u00f6s differentiaaliparit. Differentiaalijohdot tarvitsevat sovitetut pituudet ja tiiviin kytkenn\u00e4n referenssiins\u00e4. Pid\u00e4 suurnopeusparien osalta johdonmukainen et\u00e4isyys referenssitasoon ja pid\u00e4 parit kaukana meluisista verkoista.<\/p>\n\n\n\n

C. Kapeat tai pullonkaula-alueet<\/h2>\n\n\n\n

Suunnittele lopuksi pullonkaula-alueet taululle. Perussijoittelun ja yleisen reitityssuunnittelun j\u00e4lkeen etsi kapeat alueet, joilla monien verkkojen on kuljettava pienen aukon l\u00e4pi. N\u00e4m\u00e4 ovat pullonkaulakohtia. Laske kunkin pullonkaulan osalta tarvittavien johtojen, differentiaaliparien ja herkkien verkkojen m\u00e4\u00e4r\u00e4. P\u00e4\u00e4t\u00e4 sitten tarvittavien kerrosten m\u00e4\u00e4r\u00e4, jotta kaikki tarvittavat johdot voivat kulkea t\u00e4m\u00e4n alueen l\u00e4pi.<\/p>\n\n\n\n

Tee t\u00e4m\u00e4 vaihe vaiheelta:<\/p>\n\n\n\n

Merkitse pullonkaula-alue.<\/p>\n\n\n\n

Luettelo kaikista verkoista, joiden on kuljettava sen l\u00e4pi.<\/p>\n\n\n\n

Sis\u00e4llyt\u00e4 differentiaaliparit ja kriittiset signaalit luetteloon.<\/p>\n\n\n\n

Laske niiden raitojen m\u00e4\u00e4r\u00e4, jotka mahtuvat reitityskerrosta kohden kyseiseen aukkoon.<\/p>\n\n\n\n

Kerro reitityskerrosten m\u00e4\u00e4r\u00e4, jota voit k\u00e4ytt\u00e4\u00e4 kyseisell\u00e4 alueella.<\/p>\n\n\n\n

T\u00e4m\u00e4 antaa l\u00e4pi kulkevien raitojen kokonaism\u00e4\u00e4r\u00e4n. Jos t\u00e4m\u00e4 m\u00e4\u00e4r\u00e4 on pienempi kuin tarvittavien verkkojen m\u00e4\u00e4r\u00e4, lis\u00e4\u00e4 reitityskerroksia tai muuta sijoittelua ruuhkien v\u00e4hent\u00e4miseksi.<\/p>\n\n\n\n

IV. Esimerkkej\u00e4 ja yksinkertaisia nyrkkis\u00e4\u00e4nt\u00f6j\u00e4<\/h1>\n\n\n\n

A. Esimerkkej\u00e4 BGA-paosta<\/h2>\n\n\n\n

Jos voit reititt\u00e4\u00e4 kaksi j\u00e4lke\u00e4 kahden l\u00e4piviennin v\u00e4liin BGA:lla, voit usein k\u00e4ytt\u00e4\u00e4 kahta reitityskerrosta BGA:n paossa. T\u00e4m\u00e4 on yleinen tapaus 1,0 mm:n BGA-paketeissa.<\/p>\n\n\n\n

Jos voit reititt\u00e4\u00e4 vain yhden j\u00e4ljen kahden l\u00e4piviennin v\u00e4list\u00e4, saatat tarvita nelj\u00e4 reitityskerrosta kaikkien BGA-nastojen reititt\u00e4miseen. N\u00e4in k\u00e4y usein BGA-piireiss\u00e4, joiden jako on tiukempi, kuten 0,8 mm.<\/p>\n\n\n\n

B. Esimerkki liittimen reitityksest\u00e4<\/h2>\n\n\n\n

Oletetaan, ett\u00e4 monissa liittimiss\u00e4 voit reititt\u00e4\u00e4 yhden differentiaaliparin kahta l\u00e4pivienti\u00e4 kohti. K\u00e4yt\u00e4 t\u00e4t\u00e4 mitoittaaksesi reitityskanavat liittimen l\u00e4hell\u00e4. Jos liittimess\u00e4 on monia kaistoja, tarvitset enemm\u00e4n reitityskerroksia tai toisen liittimen pohjapinta-alan.<\/p>\n\n\n\n

C. Esimerkki suurnopeussignaalista<\/h2>\n\n\n\n

MIPI- tai USB-differentiaaliparin osalta pari on pidett\u00e4v\u00e4 l\u00e4hell\u00e4 vertailutasoa ja parin v\u00e4li ja j\u00e4ljen leveys on pidett\u00e4v\u00e4 oikeana kohdeimpedanssin kannalta. Jos reitityskanava on kapea, saatat tarvita useampia kerroksia, jotta layout pysyy siistin\u00e4 ja impedanssitavoitteet saavutetaan.<\/p>\n\n\n\n

V. Lis\u00e4\u00e4 signaalin eheyden ja valmistettavuuden suunnittelusta<\/h1>\n\n\n\n

A. Pid\u00e4 paluureitti lyhyen\u00e4 ja paikallisena<\/h2>\n\n\n\n

Suunnittele signaalikerrokset aina niin, ett\u00e4 paluuvirta voi kulkea l\u00e4heisell\u00e4 maatasolla. Kun signaalikerros on maatason vieress\u00e4, paluupolku on lyhyt ja s\u00e4hk\u00f6magneettinen h\u00e4iri\u00f6 on v\u00e4h\u00e4inen. Jos sijoitat signaalikerroksen kahden sekatason v\u00e4liin tai l\u00e4helle jaettua tasoa, paluupolku ei ole paikallinen. T\u00e4m\u00e4 aiheuttaa enemm\u00e4n EMI:t\u00e4 ja voi vahingoittaa signaalin eheytt\u00e4.<\/p>\n\n\n\n

B. Katso halkaistuja tasoja ja saumoja<\/h2>\n\n\n\n

Jos kone on jaettava, reitit\u00e4 herk\u00e4t signaalit niin, ett\u00e4 ne eiv\u00e4t ylit\u00e4 jakolinjaa. Jos suurnopeusverkon on ylitett\u00e4v\u00e4 tason jako, tarjoa selke\u00e4 paluukanava tai ompelu, jotta paluupolku pysyy yhten\u00e4isen\u00e4. K\u00e4yt\u00e4 l\u00e4pivientej\u00e4 ja maadoitusl\u00e4pivientej\u00e4 l\u00e4hell\u00e4 jaetun tason reunoja silmukkapinta-alan v\u00e4hent\u00e4miseksi.<\/p>\n\n\n\n

C. Pid\u00e4 virta\/maadoitusparit l\u00e4hell\u00e4 pinossa.<\/h2>\n\n\n\n

Kun asetat virtatason maatason viereen, pari muodostaa kondensaattorin. T\u00e4m\u00e4 auttaa erottamaan tehon ja v\u00e4hent\u00e4m\u00e4\u00e4n tason impedanssia. T\u00e4m\u00e4 on eritt\u00e4in hy\u00f6dyllist\u00e4 tehon eheyden kannalta. Jos sinulla on useita virtakiskoja, yrit\u00e4 ryhmitell\u00e4 ne pareittain pinoihin tai k\u00e4yt\u00e4 jaettuja tasoja vain silloin, kun hallitset reitityst\u00e4 pitkien paluureittien v\u00e4ltt\u00e4miseksi.<\/p>\n\n\n\n

D. Ota valmistettavuuss\u00e4\u00e4nn\u00f6t huomioon varhaisessa vaiheessa<\/h2>\n\n\n\n

Aseta DFM-rajat alussa. M\u00e4\u00e4rit\u00e4 minimij\u00e4ljen leveys, minimij\u00e4lkiv\u00e4li, minimirengas ja minimiporakoko. Sovita suunnittelus\u00e4\u00e4nt\u00f6j\u00e4si siihen, mit\u00e4 tehdas voi luotettavasti valmistaa. Jos suunnittelet hyvin ohuita j\u00e4lki\u00e4 tai hyvin pieni\u00e4 l\u00e4pivientej\u00e4, tarkista, pystyyk\u00f6 toimittaja k\u00e4sittelem\u00e4\u00e4n niit\u00e4 ja miten kustannukset muuttuvat.<\/p>\n\n\n\n

VI. Pullonkaulalaskelma yksityiskohtaisemmin<\/h1>\n\n\n\n

A. Miten kaistat lasketaan aukossa<\/h2>\n\n\n\n

Mittaa pullonkaula-alueen aukon leveys.<\/p>\n\n\n\n

K\u00e4yt\u00e4 suunniteltua j\u00e4ljen leveytt\u00e4 ja v\u00e4li\u00e4 laskeaksesi, kuinka monta single-ended-rataa mahtuu yhteen kerrokseen. Laske differentiaalisten parien osalta, kuinka monta paria mahtuu pariv\u00e4lien perusteella.<\/p>\n\n\n\n

Ota huomioon poissaoloalueet ja l\u00e4piviennit, jotka tukkivat radat. V\u00e4henn\u00e4 hy\u00f6tyleveytt\u00e4 l\u00e4pivientikenttien tai mekaanisten reikien viem\u00e4n tilan verran.<\/p>\n\n\n\n

B. P\u00e4\u00e4t\u00e4 kerrosten lukum\u00e4\u00e4r\u00e4 aukkokapasiteetin perusteella<\/h2>\n\n\n\n

Jos yksi kerros pystyy kuljettamaan tarvittavat kappaleet, kaikki on hyvin.<\/p>\n\n\n\n

Jos ei, lis\u00e4\u00e4 toinen reititystaso ja tarkista uudelleen.<\/p>\n\n\n\n

Jos kerrosten lis\u00e4\u00e4minen ei ole mahdollista, harkitse osien siirt\u00e4mist\u00e4, liittimen vaihtamista tai BGA-fanout-strategian muuttamista.<\/p>\n\n\n\n

VII. Kaikki yhdess\u00e4 - kerroksittaisen suunnittelun k\u00e4yt\u00e4nn\u00f6n kulku<\/h1>\n\n\n\n

Vaihe 1. Luettelo rajoituksista ja tavoitteista<\/p>\n\n\n\n

Tee lyhyt luettelo: BGA-korttien lukum\u00e4\u00e4r\u00e4 ja niiden jako, liittimien lukum\u00e4\u00e4r\u00e4, nopeiden verkkojen lukum\u00e4\u00e4r\u00e4, virtakiskoluettelo, suorituskykytavoitteet ja kustannustavoite.<\/p>\n\n\n\n

Vaihe 2. Luonnostele alustava pinoaminen<\/p>\n\n\n\n

Aloita tarvittavat virta- ja maadoitustasot l\u00e4hell\u00e4 keskustaa. Laita signaalikerrokset niiden ymp\u00e4rille. K\u00e4yt\u00e4 teho\/maapareja siell\u00e4, miss\u00e4 tarvitset matalaa impedanssia.<\/p>\n\n\n\n

Vaihe 3. Tarkista BGA-paon tarpeet<\/p>\n\n\n\n

Tarkista jokainen BGA. Jos tarvitset lis\u00e4\u00e4 pakokaistoja, lis\u00e4\u00e4 signaalikerroksia tai muuta BGA-jalanj\u00e4lke\u00e4.<\/p>\n\n\n\n

Vaihe 4. Tarkista nopeat reitityskanavat<\/p>\n\n\n\n

Merkitse kaikki suurnopeusverkot. Varaa niille reitityskanavat. Jos kanavat ovat ahtaat, lis\u00e4\u00e4 kerroksia tai muuta sijoittelua.<\/p>\n\n\n\n

Vaihe 5. Tarkista pullonkaulat<\/p>\n\n\n\n

Laske jokaisen kapean raon kapasiteetti. Jos kapasiteetti ei riit\u00e4, lis\u00e4\u00e4 kerroksia tai siirr\u00e4 tavaroita.<\/p>\n\n\n\n

Vaihe 6. Viimeistele pinoaminen ja s\u00e4\u00e4nn\u00f6t<\/p>\n\n\n\n

Korjaa pinoaminen. Aseta j\u00e4ljen leveydet, v\u00e4lit ja impedanssitavoitteet. Varmista, ett\u00e4 suunnittelussa noudatetaan DFM:\u00e4\u00e4.<\/p>\n\n\n\n

Vaihe 7. Validointi insin\u00f6\u00f6rien ja valmistajan kanssa<\/p>\n\n\n\n

Tarkastele kokoonpanoa piirilevyn valmistajan ja signaalin eheysinsin\u00f6\u00f6rien kanssa. Pyyd\u00e4 varhaisia kommentteja ja mukauta.<\/p>\n\n\n\n

VIII. Lyhyt yhteenveto<\/h1>\n\n\n\n

Kerroksen suunnittelu on sekoitus s\u00e4hk\u00f6isi\u00e4 tarpeita ja k\u00e4yt\u00e4nn\u00f6n reitityst\u00e4. Suunnittelet virta- ja maadoituskerrokset niin, ett\u00e4 virta on vakaa ja paluureitit lyhyit\u00e4. Signaalikerrokset suunnitellaan reitityskanavien, BGA-v\u00e4lien, liittimien syvyyden ja pullonkaula-alueiden perusteella. Jos suunnittelet hyvin, reititys on helpompaa ja luotettavampaa. Yksinkertaisesti ajateltuna piirilevysuunnittelu on kuin korkean rakennuksen rakentamista. Kerrossuunnitelma on piirustus. Jos piirustus on oikea, rakentaminen sujuu ongelmitta.<\/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\tMiten piirilevykerrosten m\u00e4\u00e4r\u00e4 m\u00e4\u00e4ritet\u00e4\u00e4n?<\/span><\/div>

Piirilevykerrosten m\u00e4\u00e4r\u00e4 m\u00e4\u00e4r\u00e4ytyy signaalikerrosten m\u00e4\u00e4r\u00e4n ja piirin tarvitsemien teho- ja maatasojen m\u00e4\u00e4r\u00e4n mukaan. Insin\u00f6\u00f6rit arvioivat komponenttitiheyden, reitityksen monimutkaisuuden, BGA-v\u00e4lien, nopeiden signaalien ja tehonjakelutarpeiden ennen lopullisen kerrosluvun m\u00e4\u00e4ritt\u00e4mist\u00e4.<\/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\tMiksi maatasot ovat t\u00e4rkeit\u00e4 piirilevysuunnittelussa?<\/span><\/div>

Maadoitustasot tarjoavat vakaan viitekehyksen signaaleille ja auttavat v\u00e4hent\u00e4m\u00e4\u00e4n s\u00e4hk\u00f6magneettisia h\u00e4iri\u00f6it\u00e4. Jatkuva maataso parantaa my\u00f6s signaalien eheytt\u00e4 ja tarjoaa selke\u00e4n paluupolun nopeille signaaleille.<\/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\tMiten BGA:t vaikuttavat PCB-kerroksen suunnitteluun?<\/span><\/div>

BGA-korttien nastaj\u00e4rjestelyt ovat tiheit\u00e4. BGA-kortin jako m\u00e4\u00e4ritt\u00e4\u00e4, kuinka monta johtoa voi kulkea l\u00e4pivientien v\u00e4list\u00e4. Suurempi jako mahdollistaa enemm\u00e4n reitityskanavia, kun taas pienempi jako vaatii enemm\u00e4n reitityskerroksia signaalin pakoreitityksen loppuunsaattamiseksi.<\/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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