12 Layer FR4 ENIG Impedance Control PCB
Sei PCB mabhodhi achida impedance?
1. PCB redunhu bhodhikufunga nezvekuiswa uye kuiswa kwezvinhu zvemagetsi, gare gare SMT chigamba kuiswa kunodawo kufunga nezve conductivity uye chiratidzo chekufambisa kwekuita uye dzimwe nyaya, saka zvinoda impedance yakaderera sezvinobvira.
2. PCB redunhu bhodhi mukugadzirwa kwemhangura deposition, tin plating (kana electroless plating, inopisa pfapfaidzo tin), soldering uye mamwe maitiro, zvinhu zvinoshandiswa zvinoda yakaderera resistivity, kuve nechokwadi kuti iyo yose impedance kukosha kwebhodhi redunhu zadzisa zvinodiwa zvemhando yechigadzirwa, kuitira kuti ushande zvakajairika.
3. PCB redunhu bhodhi tin plating ndiyo inonyanya kutarisana nezvinetso munharaunda yose yebhodhi kugadzirwa, ndiyo inokosha yekubatanidza inokanganisa impedance;chirema chayo chikuru chiri nyore oxidation kana deliquescence, murombo brazing, kuti redunhu bhodhi zvakaoma solder, impedance yakanyanyisa, zvichiita kuti murombo conductivity kana kusagadzikana kushanda kwebhodhi rose.
4. Kondakita muPCB redunhu bhodhi ichave neyakasiyana-siyana yekutapurirana kwechiratidzo, mutsara pachawo nekuda kwe etching, laminate ukobvu, waya hupamhi uye zvimwe zvinhu, zvichaita kuti impedance kukosha kuchinjike, kuita kuti chiratidzo chive kukanganisa, zvichitungamira mukuita kwe iyo yedunhu bhodhi inoderera, saka zvinodikanwa kudzora iyo impedance kukosha mune imwe mhando.
