Imbobo ngokwayo inamandla e-parasitic phansi.Uma ububanzi bembobo ehlukanisiwe kungqimba lwaphansi lwembobo eyaziwa ngokuthi yi-D2, ububanzi bephedi yembobo ngu-D1, ukujiya kwebhodi le-PCB kungu-T, kanye ne-dielectric constant ye-substrate yebhodi. ngu-ε, Amandla we-parasitic we-via cishe cishe u-C=1.41 ε TD1/(D2-D1)
Umthelela oyinhloko we-parasitic capacitance kumjikelezo obangelwa i-vias ukuthi yandisa isikhathi sesignali futhi inciphisa isivinini sesifunda.Isibonelo, ebhodini le-PCB elinogqinsi oluyi-50 Mil, uma kusetshenziswa i-vias enobubanzi obungaphakathi obuyi-10 Mil nobubanzi bephedi obungu-20 Mil, futhi ibanga eliphakathi kwephedi nendawo yethusi phansi liyi-32 Mil. , singakwazi cishe ukubala amandla e-parasitic we-vias sisebenzisa ifomula engenhla kanje: C=1.41 x 4.4x 0.050 x 0.020/(0.032-0.020)=0.517pF, Ukwehluka kwesikhathi sokukhuphuka okubangelwa yilokhu kukhula yilokhu: T10-90 =2.2C (Z0/2)=2.2x0.517x (55/2)=31.28ps.Kusukela kulawa manani, kungabonwa ukuthi nakuba amandla e-parasitic wendlela eyodwa angase angabi nomthelela obalulekile ekwehliseni ijubane ukukhuphuka, ukuqapha kufanele kusetshenziswe uma i-vias isetshenziswa izikhathi eziningi kuzintambo zokushintshwa kwe-interlayer.
Kanye ne-parasitic capacitance ku-via, kukhona futhi inductance ye-parasitic.I-parasitic series inductance yenza buthaka umnikelo we-bypass capacitance futhi yenza buthaka ukusebenza kahle kokuhlunga kwalo lonke uhlelo lwamandla.Ifomula elandelayo ingasetshenziswa ukuze nje ubale isilinganiso se-parasitic inductance ngokusebenzisa:
L=5.08h [ln (4h/d)+1], lapho u-L ebhekisela ekungeneni kwembobo edlulayo, u-h ubude bembobo edlulayo, futhi u-d uwububanzi bembobo yokumba emaphakathi.Kusukela kuzibalo, kungabonakala ukuthi ububanzi be-via bunomthelela omncane ku-inductance, kuyilapho ubude be-via bunomthelela omkhulu kakhulu ku-inductance.Ngokusebenzisa isibonelo esingenhla, inductance ye-via ingabalwa ngokuthi L=5.08x0.050 [ln (4x0.050/0.010)+1]=1.015nH.Uma isikhathi sokukhuphuka kwesignali singu-1ns, khona-ke usayizi wayo olinganayo we-impedance uthi: XL=π L/T10-90=3.19 Ω.
Ngokufigqiwe:
Ukukhetha i-PCB ezacile kunenzuzo ekwehliseni amapharamitha ezinambuzane
Zama ukungashintshi izendlalelo noma usebenzise i-vias engadingekile umzila wesignali
Gcoba izimbobo eduze nendawo yamandla kanye nomhlabathi, futhi ukuba izintambo zibe mfushane futhi zijiyile zezimbobo namaphini, kuba ngcono
Beka izimbobo eziningi zaphansi eduze kwesendlalelo sokushintsha isignali ukuze unikeze isekethe eseduze yesiginali
Lapho wenza uchungechunge lwemikhiqizo ye-fiber optical, njenge-optical module,I-ONU, i-optical fibre module, imojula ye-OLT, njll., kufanele ucabangele umthelela we-vias ku-bosa, umdwebo wamehlo odluliselayo, isilinganiso sokushabalala, njll., noma umthelela wokuthola ukuzwela
Okungenhla ukubuka okufushane kwe-"Isingeniso Semingcele Eyinhloko ye-BOSA - ngosayizi (II)", engasetshenziswa njengereferensi.Inkampani yethu inethimba lezobuchwepheshe eliqinile futhi ingahlinzeka ngezinsizakalo zobuchwepheshe kumakhasimende.Njengamanje, inkampani yethu inemikhiqizo ehlukahlukene: ehlakaniphilewena, imodyuli ye-optical yokuxhumana, imojula ye-fiber optical, i-sfp optical module, imishini ye-olt, ukushintshwa kwe-Ethernet nezinye izinto zenethiwekhi.Uma udinga, ungafunda okwengeziwe ngabo.
