I-PCB impedance ibhekisa kwiiparamitha zokuchasa kunye nokusabela, ezidlala indima ye-anobstruction ekutshintsheni okwangoku. Kwimveliso yebhodi yesekethe ye-pcb, unyango lwe-impedance luyimfuneko. Ngaba uyazi ukuba kutheni iibhodi zesekethe zePCB kufuneka zenze i-impedance?

1, PCB ibhodi yesekethe ezantsi ukuqwalasela ufakelo amacandelo elektroniki, conductivity zombane kunye nokusebenza umqondiso transmission emva kokufaka, ngoko kuya kufuna i-impedance ephantsi, ngcono, resistivity ingaphantsi kwe-1 × 10-6 ngesentimitha nganye square ngezantsi.

2, ibhodi yesekethe PCB kwinkqubo yemveliso ukufumana amava ukutshona kobhedu, tin plating (okanye electroless plating, okanye itoti yokutshiza eshushu), amalungu solder kunye namanye amakhonkco imveliso inkqubo, kunye nezinto ezisetyenziswa kwezi links kufuneka ziqinisekise ukuba resistivity ezantsi, ngo. ukuze kuqinisekiswe ukuba i-impedance iyonke yebhodi yesekethe ye-PCB iphantsi ukuhlangabezana neemfuno zomgangatho wemveliso, inokusebenza ngokuqhelekileyo.

I-3, i-tinning yebhodi ye-PCB yeyona nto ithandwa kakhulu kwiingxaki kwimveliso yebhodi yesekethe yonke, kwaye likhonkco eliphambili elichaphazela i-impedance. Esona siphene sikhulu sekhemikhali ye-tin plating layer yi-discoloration elula (zombini i-oxidation elula okanye i-delixing), ukunyanzeliswa okungahambi kakuhle, okuya kukhokelela kubunzima bokuwelda kwebhodi yesekethe, i-impedance ephezulu ekhokelela kumbane ongalunganga okanye ukungazinzi kwebhodi yonke yokusebenza.

I-4, ibhodi yesekethe ye-PCB kwi-conductor iya kuba neentlobo ezahlukeneyo zokudluliselwa komqondiso, xa ukuphucula izinga lokudluliselwa kwayo kwaye kufuneka ikhulise i-frequency yayo, umgca ngokwawo ukuba i-etching, ubukhulu be-laminated, ububanzi be-wire kunye nezinye izinto zahlukile, ziya kubangela i-impedance. kufanelekile ukutshintsha, ukuze ukugqwethwa komqondiso, okukhokelela ekusebenzeni kwebhodi ukuhla, ngoko kufuneka ulawule ixabiso le-impedance kuluhlu oluthile.