Umngxuma wokutyhutyha ngokwawo unamandla e-parasitic emhlabeni. Ukuba ububanzi bomngxuma wokwahlula kumgangatho womgangatho womngxuma wokutyhutyha yaziwa ngokuba yi-D2, ububanzi bomngxuma wokutyhutyha yi-D1, ubukhulu bebhodi ye-PCB yi-T, kunye ne-dielectric engaguqukiyo ye-substrate yebhodi. ngu ε, Umthamo weparasitic wendlela umalunga ne C=1.41 ε TD1/(D2-D1)
Impembelelo ephambili ye-parasitic capacitance kwisekethe ebangelwa yi-vias kukuba yandisa ixesha lomqondiso kunye nokunciphisa isantya sesiphaluka. Umzekelo, kwibhodi yePCB enobunzima obuyi-50 Mil, ukuba i-vias enobubanzi obungaphakathi be-10 Mil kunye nedayamitha ye-pad ye-20 Mil isetyenziswa, kwaye umgama phakathi kwepadi kunye nendawo yobhedu emhlabeni yi-32 Mil. , singakwazi malunga nokubala i-parasitic capacitance ye-vias ngokusebenzisa le fomyula ingentla ngolu hlobo lulandelayo: C=1.41 x 4.4x 0.050 x 0.020/(0.032-0.020)=0.517pF, Ukwahluka kwexesha lokunyuka okubangelwa kwesi sikhundla: T10-90 =2.2C (Z0/2)=2.2x0.517x (55/2)=31.28ps. Ukusuka kula maxabiso, kunokubonwa ukuba nangona i-parasitic capacitance yendlela enye ayinakuba nefuthe elibalulekileyo ekucutheni ukunyuka, isilumkiso kufuneka sisetyenziswe ukuba i-vias isetyenziswe amaxesha amaninzi kwiingcingo zokutshintsha kwe interlayer.
Kunye ne-parasitic capacitance kwi-via, kukwakho inductance yeparasitic. I-parasitic series inductance yenza buthathaka igalelo le-bypass capacitance kwaye yenza buthathaka ukusebenza kakuhle kokucoca kwayo yonke inkqubo yamandla. Le fomula ilandelayo inokusetyenziselwa ukubala ngokulula inductance yeparasitic ngale ndlela:
L=5.08h [ln (4h/d)+1], apho u-L ebhekisa kwi-inductance yomngxuma odlulayo, h bubude bomngxuma ophumelayo, kwaye u-d bububanzi bomngxuma osembindini wokugrumba. Ukusuka kwi-equation, kunokubonwa ukuba ububanzi be-via bunempembelelo encinci kwi-inductance, ngelixa ubude be-via bunempembelelo enkulu kwi-inductance. Usebenzisa lo mzekelo ungasentla, inductance ye-via ingabalwa njenge L=5.08x0.050 [ln (4x0.050/0.010)+1]=1.015nH. Ukuba ixesha lokunyuka kwesignali yi-1ns, ngoko ubungakanani bayo obulinganayo be-impedance: XL=π L/T10-90=3.19 Ω.
Isishwankathelo:
Ukukhetha i-PCB encinci kunenzuzo ekunciphiseni iparasitic parameters
Zama ukungatshintshi iileya okanye usebenzise i-vias engeyomfuneko kumzila womqondiso
Gqoka imingxuma kufutshane nombane kunye nomhlaba, kwaye imfutshane kwaye ijiyile iingcingo zemingxuma kunye nezikhonkwane, kungcono.
Beka imingxuma engaphezulu komhlaba kufutshane nenqanaba lokutshintsha umqondiso ukubonelela ngesekethe ekufutshane yomqondiso
Xa usenza uluhlu lweemveliso zefiber optical, ezifana nemodyuli ye-optical,I-ONU, imodyuli yefiber ebonakalayo,OLTimodyuli, njl.njl., Kuya kufuneka uqwalasele ifuthe le-vias kwi-bosa, ukuhambisa umzobo wamehlo, umlinganiso wokuphela, njl., okanye impembelelo ekufumaneni ubuntununtunu.
Oku ngasentla kumbono omfutshane we "Intshayelelo kwiiParameters eziPhambili zeBOSA - ngesayizi (II)", enokusetyenziswa njengesalathiso. Inkampani yethu ineqela lobugcisa elomeleleyo kwaye inokubonelela ngeenkonzo zobuchwephesha kubathengi. Okwangoku, inkampani yethu ineemveliso ezahlukeneyo: ezikrelekrelewena, imodyuli yonxibelelwano yamehlo, imodyuli yefiber ebonakalayo, imodyuli ye-sfp optical,oltizixhobo, Ethernettshintshakunye nezinye izixhobo zenethiwekhi. Ukuba ufuna, unokufunda ngakumbi malunga nabo.
