6 Umaleko FR4 ENIG Impedance Control PCB
Kutheni iPCB isenza iImpedance?
I-PCB impedance ibhekisela ekuchaseni kunye neeparitha zokusabela, ezisebenza njengesithintelo kwi-alternating current.Ukusetyenzwa kwe-Impedans kubalulekile kwi-PCB.Nasi isizathu:
I-1, i-PCB yokuqwalasela ukufakwa kweplagi yamacandelo e-elektroniki, iplagi ye-SMT patch nayo kufuneka ithathele ingqalelo i-conductivity kunye nokusebenza kokudluliselwa komqondiso, ngoko kuya kufuna ukuba i-impedance iphantsi, ibe ngcono.
I-2, i-PCB kwinkqubo yokuvelisa ngokubeka ubhedu, i-electroplating tin (okanye i-electroless plating, i-toti yokutshiza eshushu), i-soldering ye-soldering kunye nezinye iinkqubo, izinto ezisetyenzisiweyo kufuneka zibe yi-resistiveivity ephantsi, ukuqinisekisa ukuba ixabiso elipheleleyo lebhodi yesekethe ukuhlangabezana nayo. iimfuno zomgangatho wemveliso, ukuze usebenze ngokuqhelekileyo.
I-3, i-PCB tin plating yeyona nto ithandwa kakhulu kwiingxaki kuyo yonke imveliso ye-PCB, likhonkco eliphambili elichaphazela i-impedance;Esona siphene saso sikhulu yi-oxidation elula okanye i-deliquesce, i-brazing engafanelekanga, ukuze i-PCB ibe nzima ukuyidibanisa, i-impedance iphezulu kakhulu, ibangele ukusebenza kakubi kwe-conductive okanye yonke intsebenzo ye-PCB ayizinzile.
I-4, umqhubi we-PCB uya kuba neentlobo ezahlukeneyo zokudluliselwa kwesignali, umgca ngokwawo ngenxa ye-etching, ubukhulu be-lamination, ububanzi be-wire kunye nezinye izinto, ziya kubangela utshintsho lwexabiso le-impedance, ukwenza ukuguqulwa komqondiso, okukhokelela ekusebenzeni kwesekethe. ukuhla kwebhodi, ngoko ke kuyimfuneko ukulawula ixabiso le-impedance phakathi koluhlu oluthile.