6 Layer FR4 ENIG Impedance Control PCB
Chifukwa chiyani PCB Ikuchita Impedance?
PCB impedance imatanthawuza kukana ndi magawo a reactance, omwe amakhala ngati chotchinga pakusintha kwapano.Kukonzekera kwa impedance ndikofunikira mu PCB.Ichi ndichifukwa chake:
1, PCB kuganizira pulagi unsembe wa zigawo zikuluzikulu zamagetsi, SMT chigamba pulagi ayeneranso kuganizira madutsidwe ndi ntchito chizindikiro kufala, kotero izo zimafunika m'munsi impedance, bwino.
2, PCB mu ndondomeko kupanga kudzera mkuwa mafunsidwe, electroplating malata (kapena electroplating plating, otentha kutsitsi malata), cholumikizira soldering ndi njira zina, zipangizo ntchito ayenera kukhala otsika resistivity, kuonetsetsa kuti wonse impedance mtengo wa bolodi dera kukumana zofunikira zamtundu wa mankhwala, kuti zigwire bwino ntchito.
3, PCB malata plating ndi ambiri sachedwa mavuto lonse PCB kupanga, ndi kugwirizana kiyi zimakhudza impedance;Chilema chake chachikulu ndi oxidation yosavuta kapena deliquesce, kuwotcha koyipa, kotero kuti PCB ndizovuta kuwotcherera, kutsekereza kumakhala kokwera kwambiri, zomwe zimapangitsa kuti magwiridwe antchito asamayende bwino kapena magwiridwe antchito onse a PCB sakhazikika.
4, kondakitala mu PCB adzakhala ndi zosiyanasiyana kufala chizindikiro, mzere wokha chifukwa etching, makulidwe lamination, waya m'lifupi ndi zinthu zina, zidzachititsa impedance mtengo kusintha, kupanga chizindikiro kupotoza, chifukwa ntchito dera. kutsika kwa board, kotero ndikofunikira kuwongolera mtengo wa impedance mkati mwamitundu ina.