Kodi chikhalidwe cha impedance mu PCB ndi chiyani?Momwe mungathetsere vuto la impedance?

Ndi kukweza kwa katundu kasitomala, izo pang'onopang'ono akufotokozera kwa malangizo a nzeru, kotero zofunika PCB bolodi impedance akukhala okhwima, amene amalimbikitsanso kukhwima mosalekeza wa luso impedance kapangidwe.
Kodi khalidwe la impedance ndi chiyani?

1. Kukaniza komwe kumapangidwa ndi kusinthasintha kwamakono mu zigawozo kumagwirizana ndi capacitance ndi inductance.Pakakhala kufalikira kwa ma waveform mu kondakitala, kukana komwe kumalandira kumatchedwa impedance.

2. Kukaniza ndiko kukana komwe kumapangidwa ndi ndondomeko yeniyeni pazigawo, zomwe zimagwirizana ndi magetsi, resistivity, ndi panopa.

Kugwiritsa ntchito khalidwe impedance

1. Zomwe zimagwiritsidwa ntchito pamagetsi othamanga kwambiri komanso maulendo othamanga kwambiri, magetsi operekedwa ndi bolodi losindikizidwa ayenera kulepheretsa kuwonetsetsa panthawi yotumiza chizindikiro, kusunga chizindikiro, kuchepetsa kutaya, ndi kutenga nawo mbali.Kutumiza kokwanira, kodalirika, kolondola, kopanda nkhawa komanso kopanda phokoso.

2. Kukula kwa impedance sikungamveke ngati zazikulu kapena zazing'ono bwino, fungulo likufanana.

Control magawo a khalidwe impedance

Kukhazikika kwa dielectric kwa pepala, makulidwe a dielectric wosanjikiza, kutalika kwa mzere, makulidwe amkuwa, ndi makulidwe a chigoba cha solder.

Mphamvu ndi kuwongolera kwa solder mask

1. Kuchuluka kwa chigoba cha solder kumakhala ndi zotsatira zochepa pa impedance.Kuchuluka kwa chigoba cha solder kumawonjezeka ndi 10um, ndipo mtengo wa impedance umasintha 1-2 ohms okha.

2. Pamapangidwe, pali kusiyana kwakukulu pakati pa chisankho cha chivundikirocho ndipo palibe chivundikiro cha solder mask, osakwatiwa 2-3 ohms, ndi kusiyana kwa 8-10 ohms.

3. Popanga matabwa a impedance, makulidwe a solder mask nthawi zambiri amayendetsedwa molingana ndi zofunikira zopanga.

Kuyesa kwa impedance

Njira yayikulu ndi njira ya TDR (Time Domain Reflectometry).Mfundo yaikulu ndi yakuti chidacho chimatulutsa chizindikiro cha pulse, chomwe chimapindika mmbuyo kudzera muyeso la bolodi la dera kuti muyese kusintha kwa khalidwe la impedance ya kutulutsa ndi kubwereranso kumbuyo.Pambuyo pa kompyuta kusanthula khalidwe impedance, linanena bungwe khalidwe impedance ndi linanena bungwe.

Kuthana ndi zovuta za impedance

1. Ponena za magawo owongolera a impedance, zofunikira zowongolera zitha kukwaniritsidwa mwa kusinthana pakupanga.

2. Pambuyo pakupanga, bolodi imadulidwa ndikuwunikidwa.Ngati makulidwe a sing'anga achepetsedwa, mzerewo ukhoza kuchepetsedwa kuti ukwaniritse zofunikira;ngati makulidwe ndi wandiweyani kwambiri, mkuwa ukhoza kukulitsidwa kuti uchepetse mtengo wa impedance.

3. M'mayesero, ngati pali kusiyana kwakukulu pakati pa chiphunzitsocho ndi chenichenicho, chotheka chachikulu ndichoti pali vuto ndi mapangidwe a uinjiniya ndi mapangidwe a mzere woyesera.