Ukukhethwa Kwezinto Ze-PCB Ezisheshayo Eziphezulu Zobuqotho Besignali

Ebhodini elinesivinini esikhulu, i-laminate iyingxenye yesekethe. Izakhiwo zikagesi ze-dielectric zakha yonke imigqa yokudlulisela ebhodini, zibeka ukubambezeleka kokusabalala, futhi zinqume ukuthi ingakanani ingxenye ngayinye ehlala ohambweni kusukela kumshayeli kuya kumukeli. Ngakho-ke ukukhetha izinto kungenye yezinqumo ezinenzuzo ephezulu kakhulu kulo lonke umklamo - futhi ngo-2026 futhi kungenye yezindawo ezivinjelwe kakhulu ukuphakelwa. Lo mhlahlandlela uhamba ngezakhiwo zezinto ezibalulekile ekuthembekeni kwesignali, lapho i-FR-4 ejwayelekile iyeka ukwanele, lokho i-AI kanye nehadiwe yokuxhumana edingayo ngempela, nokuthi ungayivala kanjani ukukhetha kusenesikhathi ukuze uhlelo lungaphazanyiswa yibanga elingatholakali.

Izakhiwo Zezinto Ezibalulekile

Izakhiwo ezine ze-laminate zibusa ukukhethwa kwezinto ezisheshayo. I-dielectric constant (Dk) ibeka ijubane le-impedance kanye ne-propagation. Isici sokuhlakazeka (Df) sibeka ukulahleka kwe-dielectric. Izinga lokushisa lokushintsha kwengilazi (Tg) libeka ukuqina kokushisa kwe-resin ngesikhathi sokuhlanganiswa nokusebenza. Futhi i-coefficient of thermal expansion (CTE), ikakhulukazi ku-z-axis, ibusa ukuthembeka ngokujikeleza kokushisa. Ngokuqondene nobuqotho besignali yesivinini esikhulu, i-Dk kanye ne-Df yizimbhangqwana ezihamba phambili: i-Dk ngoba ukulawulwa kwe-impedance kuncike kuyo, i-Df ngoba ukulahleka kokufakwa kuncike kuyo.

Isici sesihlanu, esivame ukunganakwa ukuzinza kwe-Dk — ukuthi i-dielectric constant ihlala injalo kangakanani phakathi kwemvamisa naphakathi kwephethini ye-glass-weave. Imiphumela ye-Glass-weave ingabangela ukuhlukahluka kwe-Dk yendawo okukhiqiza ukugoba phakathi kwama-differential pairs, yingakho imiklamo yezinga eliphezulu ngezinye izikhathi ichaza izakhiwo ze-spread-glass noma ezijikelezwe ngomshini. Ubudlelwano phakathi kwalezi zinhlaka buchazwe ngokuqhubekayo kwe-dielectric kanye ne-loss tangent kanye nokubuka konke okubanzi kwezinto ze-PCB zesivinini esikhulu.

Ukuqonda i-Dk, i-Df, i-Tg, ne-CTE

I-Dk (i-dielectric constant) inquma ukuthi isignali isakazeka ngokushesha kangakanani nokuthi iyiphi i-trace geometry eveza impedance eqondiwe. I-Dk ephansi, ezinzile kakhulu isekela ukusakazeka okusheshayo kanye nokulawulwa kwe-impedance okulula; iphutha le-Dk likhiqiza ngqo iphutha le-impedance, ngakho-ke umklamo kumele usebenzise i-Dk yangempela ye-laminate kunokuba usebenzise ishidi ledatha elijwayelekile.

I-Df (isici sokusabalalisa, i-tangent yokulahlekelwa) inquma ukuthi ingakanani amandla esignali emuncwa yi-dielectric. I-FR-4 ejwayelekile ine-Df eyamukelekayo ngesivinini esiphansi kodwa iphakeme kakhulu kumashaneli amade anezinga eliphezulu; amazinga okulahlekelwa okuphansi asebenzisa ama-resin akhethekile ukwehlisa i-Df ngomyalo wobukhulu noma ngaphezulu, okuyikho okugcina ukulahlekelwa kokufakwa ngaphakathi kwesabelomali ngamanani aphezulu e-SerDes.

I-Tg (izinga lokushisa lokushintsha kwengilazi) izinga lokushisa lapho i-resin ithambisa khona. Izinto ze-High-Tg (170+) zimelana nokucindezeleka kokushisa kokuhlanganiswa okungenalo i-lead kanye nokusebenza kokushisa okuphezulu; kodwa ukucacisa i-High-Tg lapho iphrofayili yokushisa ingadingi khona kunezela cishe izindleko zezinto ezingu-20–40% ngaphandle kwenzuzo, izindleko ezingagwenywa emakethe yamanje. Bheka izinto ze-PCB ze-High-Tg ukuze uthole imininingwane.

I-CTE (i-coefficient of thermal expansion) , ikakhulukazi inani le-z-axis, ilawula ukuthi ibhodi likhula kangakanani ngokujikeleza kokushisa. I-CTE ephezulu ye-z-axis igcizelela izimbobo ezifakwe amapulangwe futhi iyinkinga yokuthembeka kwamabhodi anezingqimba eziphakeme kanye namabhodi ajikelezwe ngokushisa. Izinto ze-CTE ephansi kanye nama-stack-up alinganiselayo kunciphisa lokhu.

Uma i-FR4 ingasafaneleki

I-FR-4 isalokhu iyimpahla efanele iningi lamabhodi, kodwa ayibe isafaneleka lapho isabelomali sokulahlekelwa kwesiteshi singasakwazi ukubekezelela i-FR-4's Df ngaphezu kobude bokulandelela obudingekayo ngesilinganiso sedatha esidingekayo. Njengesiqondiso esisebenzayo, i-FR-4 iba yimingcele njengoba iziteshi zingena ebangeni eliphezulu le-gigabit nobude bukhula; kumazinga e-112G kanye ne-224G SerDes, impahla yokulahlekelwa okuphansi iba yimpoqo ngoba ukulahlekelwa kokufakwa kwe-FR-4 kuzovala iso. Iziphetho zangaphambili ze-RF kanye ne-microwave, lapho ukuzinza kwe-Df kanye ne-Dk kubaluleke khona, nakho kuwela ngaphandle kwemvilophu ye-FR-4.

Umgomo oyinhloko ukwenza lesi sahlulelo ngesiteshi kanye nangesendlalelo, hhayi ngebhodi. Imiklamo eminingi ixuba iziteshi ezimbalwa zezinga eliphezulu neningi lezimpawu ezivamile, futhi isidingo sezinga eliphezulu sisebenza kuphela ezingqimbeni ezithile. Yilokhu okwenza ama-hybrid stack-up abe yigugu kangaka: izinto zekhwalithi ephezulu ziya kuphela lapho isabelomali sokulahlekelwa sidinga khona. Ukuhlaziywa komkhawulo kulokho okuyi-PCB yesivinini esiphezulu kanye nesiqondiso sokuklama ekwakhiweni kwe-PCB yesivinini esiphezulu . Ngokwenziwa kwe-EM-892K kwamapulatifomu esivinini esiphezulu , qinisekisa ukwakhiwa kwezinto, iphrofayili yethusi kanye ne-stackup eqediwe ngokumelene nezidingo zesiteshi ngaphambi kokuvuma ukwakhiwa kokukhiqiza.

Ukukhetha Izinto Ezibalulekile ze-AI kanye ne-Networking Hardware

I-AI kanye nehadiwe yokuxhumana yesivinini esiphezulu ziphezulu esitebhisini sezinto ezibonakalayo. Ukuqhubekela phambili kwamapulatifomu e-AI wokubala kuye kwaholela ekukhuphukeni kwesilinganiso sebanga le-CCL, futhi isinyathelo ngasinye sishintsha i-resin chemistry, iphrofayili yethusi-foil, kanye nebanga lendwangu yengilazi ngasikhathi sinye - ukuphindaphinda izindleko zezinto kunokuba kungeze kukho. Izibalo zemboni zibeka i-M6 cishe ku-3–5× standard FR-4, i-M7 ku-6–9×, i-M8 ku-10–15×, kanye ne-M9 Q-glass ku-15–20×, kanye nebanga lesizukulwane esilandelayo le-M10 ekuqeqeshweni eliqondiswe ku-Df ngaphansi kuka-0.002 ukuze kusayinwe i-448G+.

Kwamabhodi amaningi enethiwekhi asheshayo, amazinga okulahlekelwa aphakathi kuya kwaphansi (isigaba se-M4–M7) amboza isidingo, ngemindeni efana ne-Panasonic Megtron 6/7, i-Isola I-Tera/I-Speed, i-TUC Tachyon, i-EMC, kanye namazinga e-Iteq asetshenziswa kakhulu. Amabhodi wokubala e-AI asezingeni eliphezulu kanye nezindiza eziphakathi ziya endaweni ye-M8/M9 nge-HVLP copper foil kanye nendwangu yengilazi ye-quartz. Ngenxa yokuthi lawa mabanga ayizinto ezivinjelwe kakhulu ekushodeni kwezinto ze-PCB zamanje , ukukhethwa kumele kuhambisane nokukhetha kukagesi nokulingana okufanelekile kanye nohlelo lokwabiwa. Imininingwane yesicelo isezintweni ze-AI server PCB kanye nomongo wokuhlinzekwa ekuhlaziyweni kwesidingo se-AI server PCB.

Izinto Okucatshangwayo Ngokuhlela Okuhlanganisiwe

Ukuhlela i-stack-up yilapho ukukhethwa kwezinto kuba ibhodi elakhiwe khona. Izinto eziningana ezibalulekile ezidizayinwe ngesivinini esikhulu. Isendlalelo ngasinye sesignali esisezingeni eliphezulu sidinga indiza yokubhekisela eqinile eduze ukuze inikeze indlela ehlanzekile yokubuya; isendlalelo sesignali esibhekiselwe kundiza ehlukanisiwe noma ehlukanisiwe sakha ukungaqhubeki kwe-impedance kanye ne-EMI. Ubukhulu be-dielectric phakathi kwezendlalelo zesignali nezethenjwa bubeka i-impedance kanye nobubanzi bokulandelela, ngakho-ke kumele zikhethwe njengohlelo olusebenzisa i-laminate yangempela i-Dk. Ukulingana kubalulekile ekulawuleni i-warpage, ikakhulukazi kumabhodi e-high-layer-count. Futhi ngo-2026, i-stack-up kufanele ihlelwe ngokutholakala kanye nokusebenza: ukuvala ibanga eliyivelakancane kakhulu ezingqimbeni eziludingayo, nokufanelekela ibanga elilinganayo, kwakha uthango lwesakhiwo ngokumelene nokulahlekelwa isabelo.

Ukuhlanganiswa kwe-hybrid okusebenzisa ibanga le-premium ezingqimbeni ezibalulekile kanye ne-high-Tg FR-4 kokunye kunganciphisa ukusetshenziswa kwezinto ezibonakalayo ze-premium kakhulu ngenkathi kusahlangabezana nezinhloso zokulahlekelwa kanye ne-impedance - futhi kunciphisa inkinga yokwabiwa kwezingqimba ezimbalwa kunebhodi lonke. Okusebenza kahle kusesiqondisweni sethu se-PCB stack-up esisheshayo kanye nomhlahlandlela we-PCB stack-up.

Isibuyekezo Somkhiqizi Ngaphambi Kokwenza

Ukubuyekezwa komkhiqizi ngaphambi kokwenziwa kuyisinyathelo esiguqula ukukhethwa kwezinto zibe umklamo oqinisekisiwe, owakhiwe, notholakala kuwo. Kwibhodi elinesivinini esikhulu ukubuyekezwa kuqinisekisa ukuvimba kusetshenziswa i-laminate Dk yangempela, kuhlola ukuqhubeka kwendiza yereferensi ngaphansi kwezimpawu zesilinganiso esiphezulu, kuqinisekisa ukuthi ibanga elichaziwe lihambisana nesabelomali sokulahlekelwa ngaphandle kokucaciswa ngokweqile, futhi - okubaluleke kakhulu emakethe yamanje - kuhlola ukutholakala kwebanga elichaziwe futhi kukhomba okulingana okufanelekile. Ukubamba inkinga yezinto noma ukuvimba kulesi sigaba kubiza umjikelezo wokubuyekezwa; ukuyibamba ngemva kokwenziwa kubiza ukuphindaphinda kanye nokwabiwa kwezinto ezilahlekile.

I-Highleap Electronics inikeza izibalo eziqinisekisiwe zokuhlanganisa i-stack ngokusebenzisa amanani e-laminate alinganisiwe e-Dk kanye nokubuyekezwa kokwenziwa kwangaphambili okuhlanganisa i-impedance, ubuqotho be-reference-plane, kanye nokutholakala kwezinto zokwakha ezisheshayo.

Thola Isibuyekezo Sokuqoqwa Kwe-PCB Esisheshayo

I-Highleap Electronics yakha amabhodi anesivinini esiphezulu kuwo wonke amazinga okulahlekelwa okuphakathi kanye nokulahlekelwa okuphansi ngokusebenzisa izinhlelo zethu zokukhiqiza ze-PCB ezinesivinini esikhulu kanye nezinhlelo ze-PCB ezivame kakhulu.

Imibuzo Evame Ukubuzwa Yezinto Ze-PCB Ezisheshayo

Yiziphi izakhiwo zezinto ezibaluleke kakhulu ekuthembekeni kwesignali yesivinini esikhulu->

I-Dielectric constant (Dk) kanye ne-dissipation factor (Df) lead, ngoba zibeka i-impedance kanye nokulahleka kwe-dielectric. I-Tg ibalulekile ekuqineni kokushisa kanye ne-CTE yokuthembeka kokujikeleza kokushisa. Ukuqina kwe-Dk phakathi kwemvamisa kanye nokuluka kwengilazi nakho kuthinta ukugoba kuma-differential pairs.

Ingakanani izinga ledatha lapho i-FR-4 iyeka ukufaneleka khona->

Kuncike kubude besiteshi, kodwa i-FR-4 iba yincane njengoba iziteshi zingena kumazinga aphezulu e-gigabit kanye nobude obude, futhi izinto ezilahlekelwa kancane ziba yimpoqo kumazinga e-112G/224G SerDes ngoba ukulahlekelwa kokufakwa kwe-FR-4 kuzovala iso. Ukwahlulela kufanele kwenziwe ngesiteshi ngasinye kanye nesendlalelo ngasinye.

Iyini ileli yebanga le-CCL futhi kungani ibalulekile ngezindleko->

Isinyathelo ngasinye sokukhuphuka ileli (FR-4 kuya ku-M4, M6, M7, M8, M9) sishintsha i-resin, i-foil, kanye nengilazi ngasikhathi sinye, siphindaphinda izindleko zezinto. Iziphindaphindi ezilinganiselwe uma kuqhathaniswa ne-FR-4: M6 ~3-5x, M7 ~6-9x, M8 ~10-15x, M9 ~15-20x. Ukucacisa okuphezulu kunalokho okudingekayo kuyabiza.

Ingabe kufanele ngisebenzise i-hybrid stack-up->

Ngokuvamile yebo, lapho ezinye izendlalelo kuphela ziphethe izimpawu zezinga eliphezulu. Ukubeka izinto ze-premium kuphela ezingqimbeni ezibalulekile kanye ne-FR-4 kokunye kunciphisa ukusetshenziswa kwezinto ze-premium kanye nezindleko ngenkathi kusahlangabezana nezinhloso zokulahlekelwa kanye ne-impedance, futhi kunciphisa ingozi yokuhlinzeka ngezingqimba ezimbalwa.

Kungani kufanele kubalwe impedance nge-laminate yangempela i-Dk->

Ngoba iphutha le-Dk lihumusha ngqo ephutheni le-impedance. Ukusebenzisa ishidi ledatha eliyinombolo esikhundleni senqubo yangempela i-Dk kungabeka i-impedance yebhodi ngaphandle kokubekezelelana, kwehlisa ubuqotho besiginali into yesivinini esiphezulu eyakhethwa ukuyivikela.