Kubwera kwa zaka zambiri, kugwiritsa ntchito matabwa a pcb kukuchulukirachulukira, ndipo kukula kwa matabwa a pcb kukukulirakulira.Monga zida zamagetsi zimakonzedwa mochulukira kwambiri pa PCB, kusokoneza magetsi kwakhala vuto losapeŵeka.Popanga ndi kugwiritsa ntchito matabwa amitundu yambiri, chizindikiro cha chizindikiro ndi mphamvu ziyenera kupatulidwa, kotero kuti mapangidwe ndi makonzedwe a stack ndi ofunika kwambiri.Dongosolo labwino la mapangidwe limatha kuchepetsa kwambiri chikoka cha EMI ndi crosstalk pama board a multilayer.
Poyerekeza ndi matabwa wamba osanjikiza amodzi, mapangidwe a matabwa amitundu yambiri amawonjezera zigawo zazizindikiro, zigawo zamawaya, ndikukonza zigawo zodziyimira pawokha ndi zigawo zapansi.Ubwino wa matabwa amitundu yambiri umawonetsedwa makamaka popereka mphamvu yokhazikika yosinthira chizindikiro cha digito, ndikuwonjezera mphamvu pagawo lililonse panthawi imodzimodzi, kuchepetsa kusokoneza pakati pazizindikiro.
Mphamvu yamagetsi imagwiritsidwa ntchito m'dera lalikulu la kuyika kwa mkuwa ndi nthaka yosanjikiza, yomwe ingachepetse kwambiri kukana kwa mphamvu yamagetsi ndi pansi, kotero kuti voteji pamtunda wamagetsi ndi wokhazikika, ndi makhalidwe a mzere uliwonse wa chizindikiro. zitha kutsimikiziridwa, zomwe ndizopindulitsa kwambiri pakuchepetsa komanso kuchepetsa kufalikira.Popanga matabwa apamwamba kwambiri, zakhala zikufotokozedwa momveka bwino kuti zoposa 60% za ndondomeko zopangira stacking ziyenera kugwiritsidwa ntchito.Ma board amitundu ingapo, mawonekedwe amagetsi, komanso kupondereza kwa ma radiation a electromagnetic onse ali ndi zabwino zosayerekezeka kuposa matabwa otsika.Pankhani ya mtengo, nthawi zambiri, zigawo zambiri zimakhalapo, mtengo wake ndi wokwera mtengo kwambiri, chifukwa mtengo wa bolodi la PCB umagwirizana ndi chiwerengero cha zigawo, ndi kachulukidwe pagawo lililonse.Pambuyo pochepetsa chiwerengero cha zigawo, malo opangira mawaya adzachepetsedwa, potero akuwonjezera kuchuluka kwa mawaya., ndipo ngakhale kukwaniritsa zofunikira pakupanga pochepetsa m'lifupi mwake ndi mtunda.Izi zikhoza kuonjezera ndalama moyenera.N'zotheka kuchepetsa stacking ndi kuchepetsa mtengo, koma zimapangitsa kuti magetsi awonongeke kwambiri.Mapangidwe amtunduwu nthawi zambiri amakhala osagwirizana.
Kuyang'ana pa PCB microstrip wiring pa chitsanzo, wosanjikiza pansi angathenso kuonedwa ngati gawo la mzere kufala.Chosanjikiza chamkuwa chapansi chingagwiritsidwe ntchito ngati njira yolumikizira mzere wa chizindikiro.Ndege yamagetsi imalumikizidwa ndi ndege yapansi kudzera pa decoupling capacitor, pankhani ya AC.Onse ndi ofanana.Kusiyana pakati pa mafupipafupi otsika ndi mafupipafupi amakono amakono ndi kuti.Pafupipafupi, kubwereranso kumatsatira njira yochepetsera kukana.Pama frequency apamwamba, kubweza kwapano kumakhala panjira ya inductance yochepa.Zomwe zilipo pano zimabwerera, zokhazikika ndikugawidwa molunjika pansi pa zizindikiro za chizindikiro.
Pankhani ya mafupipafupi, ngati waya wayikidwa mwachindunji pamtunda wosanjikiza, ngakhale pali malupu ochulukirapo, kubwereranso komweko kumabwereranso ku gwero lazizindikiro kuchokera ku waya wosanjikiza pansi pa njira yoyambira.Chifukwa njira iyi ili ndi zopinga zochepa.Mtundu uwu wa ntchito yaikulu capacitive lumikiza kupondereza munda magetsi, ndi osachepera capacitive lumikiza kupondereza maginito chomera kukhala otsika reactance, timachitcha kudziteteza.
Zitha kuwoneka kuchokera ku chilinganizo kuti pamene panopa ikuyenda kumbuyo, mtunda wochokera ku mzere wa chizindikiro umakhala wosiyana kwambiri ndi kachulukidwe kameneka.Izi zimachepetsa kuzungulira kwa loop ndi inductance.Panthawi imodzimodziyo, zikhoza kuganiziridwa kuti ngati mtunda wa pakati pa mzere wa chizindikiro ndi kuzungulira uli pafupi, mitsinje ya ziwirizi imakhala yofanana ndi kukula kwake komanso mosiyana.Ndipo mphamvu ya maginito yopangidwa ndi malo akunja ikhoza kuthetsedwa, kotero kuti EMI yakunja imakhalanso yaing'ono kwambiri.Pamapangidwe a stack, ndi bwino kuti chizindikiro chilichonse chigwirizane ndi malo oyandikana kwambiri.
Pavuto la crosstalk pamtunda wosanjikiza, crosstalk yomwe imayambitsidwa ndi mabwalo othamanga kwambiri makamaka chifukwa cha kulumikizana kochititsa chidwi.Kuchokera pamndandanda wamakono wa loop, titha kunena kuti mafunde a loop opangidwa ndi mizere iwiri yoyandikirana adzalumikizana.Kotero padzakhala kusokoneza maginito.
K mu chilinganizo chikugwirizana ndi nthawi yokwera chizindikiro komanso kutalika kwa mzere wa chizindikiro chosokoneza.Pakuyika kwa stack, kufupikitsa mtunda pakati pa chizindikiro cha chizindikiro ndi nthaka pansi kudzachepetsa bwino kusokoneza kwa nthaka.Mukayika mkuwa pagawo lamagetsi ndi pansi pa waya wa PCB, khoma lolekanitsa lidzawonekera m'dera lakuyika mkuwa ngati simukumvetsera.Vuto lamtunduwu nthawi zambiri limakhala chifukwa cha kuchulukana kwa mabowo, kapena kupangika mopanda nzeru kwa malo odzipatula.Izi zimachepetsa nthawi yowonjezereka ndikuwonjezera malo ozungulira.Inductance imakula ndikupanga crosstalk ndi EMI.
Tiyenera kuyesetsa kukhazikitsa atsogoleri a sitolo awiriawiri.Izi ndikuganizira zofunikira za kapangidwe kake munjirayi, chifukwa mawonekedwe osagwirizana angayambitse kusinthika kwa bolodi la pcb.Pa chizindikiro chilichonse, ndi bwino kukhala ndi mzinda wamba ngati nthawi.Mtunda pakati pa magetsi apamwamba kwambiri ndi mzinda wamkuwa umapangitsa kuti pakhale bata ndi kuchepetsa EMI.Pamapangidwe a board othamanga kwambiri, ndege zapansi zosafunikira zitha kuwonjezeredwa kuti zizipatula ndege zamasiginidwe.
Nthawi yotumiza: Mar-23-2023