Wopanga PCB Wopikisana

Ndi kukweza kwa katundu kasitomala, izo pang'onopang'ono akufotokozera mu malangizo a nzeru, kotero zofunika PCB bolodi impedance akukhala okhwima, amenenso amalimbikitsa 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 Characteristic Impedance

1. Zinthu zamagetsi zomwe zimaperekedwa ndi bolodi losindikizidwa lomwe limagwiritsidwa ntchito potumiza ma siginecha othamanga kwambiri komanso mabwalo othamanga kwambiri ayenera kukhala kuti palibe chiwonetsero chomwe chimachitika panthawi yotumizira ma siginecha, chizindikirocho chimakhalabe chokhazikika, kutayika kwapatsiku kumachepetsedwa, komanso zofananira. zitha kukwaniritsidwa.Chizindikiro chathunthu, chodalirika, cholondola, chopanda nkhawa, chopanda phokoso.

2. Kukula kwa impedance sikungamveke mosavuta.Chachikulu chimakhala chabwino kapena chocheperako, fungulo limafanana.

Control magawo kwa 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. Makulidwe a chigoba cha solder alibe zotsatira zochepa pa impedance.Pamene makulidwe a chigoba cha solder chikuwonjezeka ndi 10um, mtengo wa impedance umasintha ndi 1-2 ohms.

2. Mu mapangidwe, kusiyana pakati pa chivundikiro solder chigoba ndi sanali chivundikiro solder chigoba chachikulu, single-kutha 2-3 ohms, ndi kusiyana 8-10 ohms.

3. Popanga bolodi la impedance, makulidwe a solder mask nthawi zambiri amawongoleredwa molingana ndi zofunikira zopanga.

Kuyesa kwa impedance

Njira yayikulu ndi njira ya TDR (time domain reflectometry).Mfundo yofunika kwambiri 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 kubwereza.Pambuyo pa kusanthula kwamakompyuta, mawonekedwe a impedance amatuluka.

Kuthetsa mavuto a impedance

1. Kwa 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 ndi wandiweyani kwambiri, mkuwa ukhoza kukulitsidwa kuti uchepetse mtengo wa impedance.

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