PCB Back Drilling yog dab tsi?
Cov txheej txheem ntawm PCB rov qab drilling, tseem hu ua kev tswj qhov tob drilling, suav nrog tshem cov stub hauv multilayer PCBs los tsim vias. Lub hom phiaj ntawm rov qab drilling yog los pab txhawb kev khiav ntawm cov teeb liab ntawm cov txheej txheem sib txawv ntawm lub rooj tsavxwm yam tsis muaj kev cuam tshuam los ntawm qhov tsis xav tau stubs.
Txhawm rau muab cov lus piav qhia meej ntawm cov txheej txheem rov qab drilling, cia peb xav txog qhov piv txwv.
Piv txwv li, muaj 12-txheej PCB nrog lub qhov sib txuas ntawm thawj thiab 12 txheej. Lub hom phiaj yog los txuas tsuas yog thawj txheej rau 9 txheej, thaum ua kom 10th mus rau 12 txheej tsis sib txuas. Txawm li cas los xij, cov khaubncaws sab nraud povtseg tsim "stubs" uas tuaj yeem cuam tshuam nrog txoj kev teeb liab, ua rau muaj teeb meem kev ncaj ncees. Rov qab drilling yuav tsum tau drilling tawm cov stubs los ntawm qhov rov qab sab ntawm lub rooj tsavxwm los txhim kho cov teeb liab kis tau tus mob.
Lub hom phiaj ntawm PCB rov qab drilling yog dab tsi?
PCB rov qab drilling yog siv los tshem tawm qhov tsis siv ntawm lub plated los ntawm lub qhov (ntawm) uas txuas mus dhau txheej txheej kawg ntawm PCB. Cov txheej txheem no yuav pab txo cov teeb meem kev ncaj ncees, xws li stub resonance thiab teeb liab reflections, uas tuaj yeem tshwm sim hauv high-speed digital designs.
"Aspect ratio" yog dab tsi?
FAQ txog cov ntawv luam tawm Circuit Board › TERMINOLOGY
Kev sib raug zoo ntawm txoj kab uas hla ntawm lub qhov thiab nws qhov ntev. Thaum lub chaw tsim khoom hais tias lawv cov khoom tsim muaj "kev sib piv" ntawm 8: 1 nws txhais tau tias, piv txwv li, lub qhov taub yog 0.20 hli hauv 1.60 hli tuab PCB.
Rau cov qauv HDI, qhov sib piv rau microvia yog txwv rau 1: 1, tab sis 0.7-0.8: 1 yog qhov zoo dua rau kev yooj yim plating.
Dab tsi yog cov txiaj ntsig ntawm PCB rov qab drilling?
Cov txiaj ntsig ntawm PCB rov qab drilling suav nrog kev txhim kho cov teeb liab kev ncaj ncees, txo qis kev poob, txhim kho crosstalk tswj, thiab nce bandwidth. Los ntawm kev tshem tawm qhov tsis siv ntawm lub thoob ntawm lub thoob, rov qab drilling minimizes stub resonance thiab teeb liab reflections, ua rau kom huv si thiab muaj tseeb dua teeb liab kis tau tus mob.