PCB impedance waxaa loola jeedaa halbeegyada iska caabinta iyo falcelinta, taas oo ka ciyaareysa doorka carqaladeynta beddelka hadda. In wax soo saarka guddiga wareegga pcb, daaweynta impedance waa lagama maarmaan. Markaa ma ogtahay sababta looxyada wareegga PCB ugu baahan yihiin inay sameeyaan impedance?

1, PCB guddiga wareegga hoose si ay u tixgeliyaan rakibaadda ee qaybaha elektarooniga ah, conductivity korantada iyo waxqabadka gudbinta signal ka dib markii la geliyo, si ay u baahan doontaa in impedance hoose, ka wanaagsan, resistivity ka yar yahay 1 × 10-6 per sentimitir labajibbaaran hoose.

2, PCB guddiga wareegga geeddi-socodka wax soo saarka si ay u la kulmaan naxaas quusin, daadin (ama daalin electroless, ama daasadda kulul buufiyo), kala goysyada alxanka iyo hababka kale ee wax soo saarka links, iyo alaabta loo isticmaalo in links kuwanu waa in la hubiyo in resistivity hoose, in si loo hubiyo in ciribtirka guud ee guddiga wareegga PCB uu hooseeyo si loo buuxiyo shuruudaha tayada badeecada, waxay u shaqeyn karaan si caadi ah.

3, tinning guddiga PCB waa kuwa ugu nugul dhibaatooyinka soo saarista guddiga wareegga oo dhan, waana isku xirka muhiimka ah ee saameeya impedance. Ciladda ugu weyn ee lakabka daasadda kiimikada waa midab fudud (labadaba oxidation fudud ama delixing), brazing liidata, taas oo u horseedi doonta alxanka adag ee guddiga wareegga, impedance sare taasoo keentay in conductivity korantada liidata ama xasilloonida ee waxqabadka guddiga oo dhan.

4, PCB guddiga wareegga ee kaari waxay yeelan doonaan noocyo kala duwan oo gudbinta signal, marka si loo hagaajiyo heerka gudbintiisa iyo waa in la kordhiyo inta jeer ee ay, line laftiisa haddii etching ah, dhumucdiisuna laminated, width silig iyo arrimo kale oo kala duwan, waxay keeni doontaa impedance ah. waa u qalantaa in la beddelo, sidaa darteed qallooca calaamadda, taasoo keentay hoos u dhaca waxqabadka guddiga, markaa waxaad u baahan tahay inaad xakameyso qiimaha impedance ee xad gaar ah.