Kodi PCB Back Drilling ndi chiyani?
The ndondomeko PCB mmbuyo pobowola, amatchedwanso ankalamulira mozama pobowola, kumaphatikizapo kuchotsa zinyalala mu multilayer PCBs kulenga vias. Cholinga cha kubowola kumbuyo ndikuwongolera kuyenda kwa ma sign pakati pa zigawo zosiyanasiyana za bolodi popanda kusokonezedwa ndi ma stubs osafunika.
Kuti tifotokoze momveka bwino pobowola kumbuyo, tiyeni tione chitsanzo.
Tiyerekeze kuti pali 12-wosanjikiza PCB yokhala ndi dzenje lolumikiza magawo oyamba ndi 12. Cholinga ndikugwirizanitsa gawo loyamba la 9, ndikusunga 10 mpaka 12 osagwirizanitsa. Komabe, zigawo zosagwirizana zimapanga "stubs" zomwe zingasokoneze njira ya chizindikiro, zomwe zimabweretsa mavuto a kukhulupirika kwa chizindikiro. Kubowola kumbuyo kumaphatikizapo kubowola ma stubs awa kumbuyo kwa bolodi kuti apititse patsogolo kufalikira kwa ma sign.
Kodi cholinga cha PCB kumbuyo kubowola ndi chiyani?
Kubowola kumbuyo kwa PCB kumagwiritsidwa ntchito kuchotsa gawo losagwiritsidwa ntchito la dzenje (kudzera) lomwe limapitilira gawo lomaliza la PCB. Njirayi imathandizira kuchepetsa kukhulupirika kwa ma siginecha, monga ma stub resonance ndi kuwunikira kwa ma siginecha, zomwe zitha kuchitika pamapangidwe apamwamba kwambiri a digito.
Kodi "aspect ratio" ndi chiyani?
Mafunso okhudza matabwa osindikizira › TERMINOLOGY
Mgwirizano wapakati pa dzenje ndi kutalika kwake. Wopanga akamanena kuti kupanga kwawo kuli ndi "chiwerengero" cha 8: 1 zikutanthauza, mwachitsanzo, kuti m'mimba mwake wa dzenje ndi 0,20 mm mu PCB ya 1.60 mm wandiweyani.
Pazinthu za HDI, kuchuluka kwa ma microvia kumangokhala 1: 1, koma 0.7-0.8: 1 ndikwabwino kuti musavutike.
Kodi ubwino wa PCB kumbuyo pobowola ndi chiyani?
Ubwino wakubowola kumbuyo kwa PCB umaphatikizapo kukhulupirika kwa siginecha, kutayika kwapang'onopang'ono, kuwongolera kopitilira muyeso, komanso kuchuluka kwa bandwidth. Pochotsa gawo lomwe silinagwiritsidwe ntchito la mbiya, kubowola kumbuyo kumachepetsa kumveka kwa ma stub resonance ndi kuwunikira kwa ma siginecha, zomwe zimapangitsa kufalitsa koyera komanso kolondola kwambiri.