Izinto ze-PCB ze-Dk Low Df Low ze-Signals ze-High Speed

Izinombolo ezimbili kushidi ledatha le-laminate zenza okuningi ekunqumeni ukusebenza kwesivinini esiphezulu kunanoma yiziphi ezinye: i-dielectric constant (Dk) kanye ne-dissipation factor (Df). Ndawonye zinquma ukuthi isignali ihamba ngokushesha kangakanani, ukuthi iyiphi i-trace geometry eveza i-target impedance, nokuthi ingakanani isignali esindayo ohambweni. Izinto ze-Low-Dk, low-Df ziyi-laminates ezenzelwe ukwenza ngcono kokubili - futhi ziyizinto eziphakathi kokubili kwengxoxo yokuklama yesivinini esiphezulu kanye nokuntuleka kwezinto zika-2026. Lo mhlahlandlela uchaza ukuthi la mapharamitha asho ukuthini, ukuthi impahla ye-Low-Dk/low-Df ikuthenga ini, ukuthi iqhathaniswa kanjani ne-FR-4, nokuthi yini ongayilindela ekukhiqizeni, izindleko, kanye nesikhathi sokuhola.

Okushiwo yi-Low Drk kanye ne-Low Df

I -dielectric constant (Dk) , ebizwa nangokuthi i-relative permittivity, ilinganisa ukuthi i-dielectric inciphisa kangakanani futhi igcine insimu kagesi. I-Dk ephansi ivumela amasignali ukuthi asakazeke ngokushesha futhi yenza kube lula ukulawula i-impedance, ngoba ku-impedance target ethile, izinto ze-Dk eziphansi zivumela i-trace geometry enokuthethelela okwengeziwe. I-Dk idinga futhi ukuzinza — njalo kuyo yonke imvamisa nakulo lonke iphethini le-glass-weave — ngoba ukuhlukahluka kuveza ukungaqhubeki kwe-impedance futhi kuhambisane phakathi kwama-differential pairs.

Isici sokuhlakazeka (Df) , esibizwa nangokuthi i-loss tangent, silinganisa ukuthi ingakanani amandla esignali i-dielectric eyimuncayo bese iphenduka ukushisa. I-Df ephansi isho ukulahlekelwa okuncane kwe-dielectric, okuyindlela yokulahlekelwa eyinhloko yeziteshi ezinde zezinga eliphezulu. Ngakho-ke izinto ze-“Low Dk, low Df” zihlanganisa ukulawulwa kwe-impedance okulula, okuzinzile nokulahlekelwa okuphansi kwesignali - yilokho kanye okudingwa yisiteshi sezinga eliphezulu. Izincazelo ezigcwele kanye nokusebenzisana kwazo ziku- dielectric constant kanye ne-loss tangent kanye ne-PCB dielectric constant.

Izinzuzo Zokunciphisa Ukulahlekelwa Yisignali

Inzuzo eyinhloko yezinto ezisetshenziswayo ze-low-Dk/low-Df ukugcina ukulahlekelwa kokufakwa ngaphakathi kwesabelomali phezu kwesiteshi. Ukulahlekelwa kokufakwa esiteshini se-PCB kuvela kakhulu emithonjeni emibili: ukulahlekelwa kwe-dielectric (okulawulwa yi-Df) kanye nokulahlekelwa komqhubi (okulawulwa ubulukhuni bethusi kanye nomphumela wesikhumba). Ukwehlisa i-Df kuhlasela ingxenye ye-dielectric ngqo; ukuyihlanganisa ne-foil yethusi ebushelelezi ephansi kuhlasela ingxenye yomqhubi. Umphumela ohlanganisiwe uyisiteshi esigcina ubukhulu besiginali obanele kanye nokuthembeka komphetho ukuze umamukeli athole idatha - iso elivulekile esikhundleni selivaliwe.

Lokhu kubaluleke kakhulu njengoba amazinga edatha ekhuphuka, ngoba ukulahleka kulinganiswa ngokuvama nobude. Ngamazinga aphansi, i-Df ephezulu ye-FR-4 ayibonakali; ngamazinga e-112G kanye ne-224G SerDes, umehluko phakathi kwe-laminate ephansi ye-Df kanye ne-FR-4 umehluko phakathi kwesixhumanisi esisebenzayo kanye nesihlulekile. Ngakho-ke inzuzo incike kakhulu ekusetshenzisweni: yangempela futhi inquma iziteshi ezisezingeni eliphezulu, ayibalulekile futhi ayifanele ukukhokhelwa ngamanani aphansi. Umongo womklamo usekukhethweni kwezinto ze-PCB ezisheshayo kanye nokwenziwa kwe-PCB ephansi yokulahlekelwa.

Ukuqhathanisa Izinto Eziphansi ze-Dk ne-FR4

Izinto ezijwayelekile ze-FR-4 kanye ne-low-Dk/low-Df zihluka kakhulu kumakhemikhali e-resin futhi, ngokuvamile, endwangu yengilazi kanye ne-foil yethusi. I-FR-4 isebenzisa i-epoxy resin ejwayelekile futhi ine-Df ephezulu kakhulu esebenza kahle ngesivinini esiphansi; amazinga e-low-Dk/low-Df asebenzisa izinhlelo ezikhethekile ze-resin - ngokuvamile ezisekelwe ku-PPO/PPE kuma-laminates aphakathi nokulahlekelwa kanye nokulahlekelwa okuphansi, noma izinhlelo ze-PTFE kanye ne-ceramic ezigcwele i-RF - ukuze kufezwe i-Df ephansi kakhulu futhi, ezimweni eziningi, i-Dk ephansi futhi ezinzile.

Izindleko zokushintshana yizindleko, ukukhiqizwa, kanye nokutholakala. Amabanga e-Low-Dk/low-Df abiza iziphindaphindo ze-FR-4 — ukukhuphuka ileli yebanga le-CCL, isinyathelo ngasinye (M6, M7, M8, M9) sandisa izindleko zezinto kunokuba singeze kuzo — futhi kunzima ukuzenza futhi okwamanje zilinganiselwe kakhulu ekutholakaleni. Ngakho-ke ukuqhathanisa okulungile akusikho “okungcono” kodwa “okudingwa yilesi siteshi ngempela.” Kwabaningi bamabhodi, i-FR-4 iyindlela efanele neshibhile; kumashaneli anezinga eliphezulu, ibanga le-Low-Dk/low-Df liyadingeka. Indlela ephakathi ewusizo i-hybrid stack-up, kusetshenziswa ibanga le-Low-Df kuphela ezingqimbeni eziludingayo. Imininingwane yokuqhathanisa iku- PTFE vs FR4 PCB kanye nokubuka konke kwezinto zesivinini esiphezulu.

Ukucatshangelwa Kwezokukhiqiza

Izinto ze-Low-Dk/low-Df zidinga kakhulu ukwenziwa kune-FR-4. Izinhlelo ze-resin ezikhethekile zivame ukudinga amaphrofayili e-lamination aguquliwe ukuze zibophane ngokuthembekile. Ama-foil ethusi abushelelezi aphansi anciphisa ukulahlekelwa yi-conductor nawo anamathela kancane kakhulu, adinga ukulungiswa ngokucophelela kwendawo. Njengoba amamaki ekhuphuka eya ku-M9, indwangu yengilazi iba yi-quartz ehlanzekile kakhulu, eba nzima futhi isheshise ukuguguleka kwe-drill-bit, i-drill coatings ethuthukisiwe edingayo kanye nokuphathwa kwempilo yamathuluzi eqinile. Futhi ngenxa yokuthi lezi zinto zikhethwe ngqo ukulawula i-impedance kanye nokulahlekelwa, ukubekezelelana kwe-impedance okulawulwayo kuqinile, ngakho-ke i-stack-up impedance kumele iqinisekiswe nge-laminate Dk yangempela kunokuba ibe yi-datasheet nominal.

Ngokuqondene nezinto ze-RF ezisekelwe ku-PTFE, ukwenziwa kuhilela izinyathelo ezengeziwe — ukwelashwa nge-plasma kokunamathela kanye nokuphathwa okukhethekile kwe-substrate ethambile — okuhlukile ekucutshungulweni okujwayelekile kwe-FR-4. Isizinda sokukhiqiza esiqondile se-RF sikulawulo lwe-RF PCB impedance kanye nezisekelo ze-impedance ekulawulweni kwe-impedance kuma-PCB anesivinini esikhulu.

Izindleko Nesikhathi Sokuhola Izinto Ezibalulekile

Izinto zokwakha ze-Low-Dk/low-Df zibiza kakhulu futhi zinomkhawulo wokutholakala, futhi lezi zici ezimbili zixhumene. Ngokuphathelene nezindleko, ileli lebanga le-CCL liphakeme: 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×. Ngenxa yokuthi isinyathelo ngasinye sebanga sishintsha i-resin, i-foil, kanye nengilazi ngesikhathi esisodwa, ukwenyuka kwezindleko kuyaphindaphindeka, hhayi ngokuqhubekayo. Lokhu kwenza ukucaciswa ngokweqile - ukukhetha ibanga le-Df eliphansi kunalokho okudingwa yisiteshi - kube yiphutha elibizayo.

Ngesikhathi sokulethwa, amamaki e-Dk/Df aphansi aphakathi kwezinto ezincishisiwe kakhulu ochungechungeni lokuhlinzekwa. Amamaki e-M6/M7 asebenza cishe emavikini ayi-14-18, i-M8/M9 ivame ukwabiwa kuphela emavikini angaphezu kwama-20, kanti okokufaka okukhethekile ngemuva kwawo (i-HVLP copper foil, indwangu yengilazi ye-quartz) kubhekene nokushoda kwamathani ayizinkulungwane eziningi. Imiphumela engokoqobo: chaza ibanga elincane le-Df elidingwa yisiteshi, ufanele ibanga lesibili elilinganayo, bese uhlela izibopho zezinto ngaphambi kwesikhathi sokukhiqiza. Imininingwane yokuhlinzekwa isesiqondisweni sesikhathi sokukhokhelwa se-PCB laminate kanye ne- PCB material deficiency Hub.

Thola Isilinganiso Somklamo we-PCB Osezingeni Eliphansi

I-Highleap Electronics yakha amabhodi e-low-Dk/low-Df kanye ne-RF ngezinhlelo zethu zokukhiqiza ze-PCB ezivame kakhulu kanye ne -PCB ezisheshayo , ngokubala okuqinisekisiwe kokufakwa kanye nokubuyekezwa kokutholakala kwezinto ezibonakalayo kuyo yonke idizayini yokuvimbela okulawulwayo.

Imibuzo Evame Ukubuzwa Ngezinto Ezincane Ze-Dk Eziphansi Ze-Df

Kusho ukuthini uDk noDf->

I-Dk (i-dielectric constant) ilinganisa ukuthi i-dielectric inciphisa kangakanani futhi igcine insimu kagesi; i-Dk ephansi, ezinzile ivumela ukusabalala okusheshayo kanye nokulawula i-impedance okulula. I-Df (isici sokuhlakazeka, i-loss tangent) ilinganisa ukuthi ingakanani amandla esignali i-dielectric eyimuncayo; i-Df ephansi isho ukulahlekelwa okuncane kwe-dielectric, okubusa ukulahlekelwa eziteshini ezinde zezinga eliphezulu.

Yini ngempela ethuthukisa izinto ezisebenzisa i-low-Dk/low-Df->

Igcina ukulahlekelwa kokufakwa ngaphakathi kwesabelomali phezu kwesiteshi, igcina ubukhulu besiginali kanye nokuthembeka komphetho ukuze umamukeli akwazi ukubuyisa idatha. Inzuzo ikhula ngesilinganiso sedatha kanye nobude bokulandelela — okunqumayo ku-112G/224G, okungabalulekile ngamanani aphansi.

Izinto ze-low-Dk/low-Df ziqhathaniswa kanjani ne-FR-4->

Isebenzisa i-resin ekhethekile (ngokuvamile i-PPO/PPE noma i-PTFE) ye-Df ephansi kakhulu futhi ngokuvamile iphansi, izinzile kakhulu, kodwa ibiza ama-multiples e-FR-4, kunzima ukuyidala, futhi inqunyelwe kakhulu ukuphakelwa. I-FR-4 isalokhu iyisinqumo esifanele kumabhodi amaningi; amamaki e-Df aphansi ayimpoqo kuphela kumashaneli anezinga eliphezulu.

Yiziphi izinselele zokukhiqiza->

Amaphrofayili e-lamination aguquliwe ohlelweni lwe-resin, ukulungiswa okucophelelayo kwendawo yama-foil abushelelezi aphansi anganamatheli kakhulu, ukubhoboza okuthuthukisiwe kwengilazi eqinile ye-quartz kumamaki aphezulu, kanye nokubekezelelana okuqinile okulawulwayo kwe-impedance okudinga ukuqinisekiswa kwe-impedance nge-laminate yangempela i-Dk.

Zibiza kangakanani futhi zilinganiselwe kangakanani lezi zinto ngo-2026->

Iziphindaphindi zezindleko uma kuqhathaniswa ne-FR-4 zisebenza cishe ngo-3-5x (M6), 6-9x (M7), 10-15x (M8), kanye no-15-20x (M9). Izikhathi zokuhola zisebenza amasonto ayi-14-18 e-M6/M7 kanye namasonto angama-20+ (ukwabiwa kuphela) e-M8/M9, kanye ne-HVLP foil kanye nendwangu yengilazi ye-quartz phakathi kokufakwayo okulinganiselwe kakhulu. Cacisa ibanga elincane elidingekayo bese ufanelana nokulingana.