Thaum ua cov ntawv luam tawm Circuit boards (PCBs), peb feem ntau txiav txim siab cov txheej txheem ntawm lub rooj tsavxwm raws li tus naj npawb ntawm cov khaubncaws sab nraud povtseg. Qhov no yog vim qhov tseem ceeb ntawm pawg thawj coj saib xyuas nyiaj txiag feem ntau ntawm cov nqi ntawm PCB, yog li kev lag luam feem ntau koom nrog cov tub ntxhais pawg thawj coj nrog cov txheej txheem. Feem ntau, ib lub rooj tsavxwm rau lub rooj tsavxwm yuav tsum tau siv ob lub rooj tsavxwm, tab sis qee qhov tshwj xeeb, cov qauv tshwj xeeb yuav tshwm sim, uas yog ntxiv cov core board uas tsis muaj txheej txheej hauv cov txheej txheem stacked. Qhov no yog qhov kev lag luam hu ua fake plywood, uas txhais tau hais tias thawj 6 txheej board tau hloov mus rau hauv yim txheej txheej, feem ntau hu ua fake yim txheej board.
Nws yuav tsum tau muab sau tseg tias lub fake yim txheej board yeej tsuas muaj rau txheej ntawm circuits, uas tsis yog dab tsi peb feem ntau xa mus raws li ib tug pa yim txheej board. Yog li ntawd, peb tseem tuaj yeem xav txog qhov fake yim txheej board ua ib daim ntawv tshwj xeeb ntawm rau lub rooj tsavxwm.
Thaum ua cov ntawv luam tawm Circuit boards (PCBs), peb feem ntau txiav txim siab cov txheej txheem ntawm lub rooj tsavxwm raws li tus naj npawb ntawm cov khaubncaws sab nraud povtseg. Qhov no yog vim qhov tseem ceeb ntawm pawg thawj coj saib xyuas nyiaj txiag feem ntau ntawm cov nqi ntawm PCB, yog li kev lag luam feem ntau koom nrog cov tub ntxhais pawg thawj coj nrog cov txheej txheem. Feem ntau, ib lub rooj tsavxwm rau lub rooj tsavxwm yuav tsum tau siv ob lub rooj tsavxwm, tab sis qee qhov tshwj xeeb, cov qauv tshwj xeeb yuav tshwm sim, uas yog ntxiv cov core board uas tsis muaj txheej txheej hauv cov txheej txheem stacked. Qhov no yog qhov kev lag luam hu ua fake plywood, uas txhais tau hais tias thawj 6 txheej board tau hloov mus rau hauv yim txheej txheej, feem ntau hu ua fake yim txheej board.
Nws yuav tsum tau muab sau tseg tias lub fake yim txheej board yeej tsuas muaj rau txheej ntawm circuits, uas tsis yog dab tsi peb feem ntau xa mus raws li ib tug pa yim txheej board. Yog li ntawd, peb tseem tuaj yeem xav txog qhov fake yim txheej board ua ib daim ntawv tshwj xeeb ntawm rau lub rooj tsavxwm.
Nyob rau hauv tus txheej txheem ntawm kev ua ib tug fake yim txheej PCB board, tooj liab ntawv nyob rau sab saum toj thiab hauv qab ntawm nruab nrab core board yog feem ntau etched tawm, ua rau nws ib tug lub teeb board. Lub sijhawm no, txawm hais tias lub rooj tsavxwm PCB tsuas yog muaj rau txheej ntawm tooj liab ntawv, nws tseem hu ua fake yim txheej board vim nws cov txheej txheem stacked ntawm yim txheej. Txawm li cas los xij, kuj tseem yuav muaj lwm qhov xwm txheej uas cov kws tsim khoom siv tau ob txheej ntawm cov ntawv ci tooj liab thiab PP nplaum los hloov lub nruab nrab lub rooj tsavxwm txhawm rau tswj cov nqi thiab kev txiav txim siab tsim. Nyob rau hauv cov ntaub ntawv no, txawm hais tias lub PCB board tseem muaj yim txheej ntawm tooj liab ntawv ci, nws tsis yog cov stacked qauv ntawm ib tug pa yim txheej board, thiab qhov teeb meem no kuj hu ua ib tug fake yim txheej board.
Yog li, vim li cas peb thiaj li yuav tsum tsim ib lub rooj tsav xwm yim txheej cuav? Vim li cas ho tsis tsim rau lub rooj tsavxwm rau txheej ncaj qha? Cov lus teb yog ua kom tau raws li qhov yuav tsum tau ua ntawm impedance tsim.
Nyob rau hauv cov ntaub ntawv no, nws yog ib qhov tsim nyog yuav tau ntxiv ib txheej ntawm lub teeb phaj ntawm L3 thiab L4 los pab ua kom tiav qhov kev cia siab stacking thickness thiab ua tau raws li qhov yuav tsum tau ntawm impedance tsim. Tib lub hauv paus ntsiab lus tseem siv tau rau 6 txheej boards thiab fake rau txheej boards. Tau kawg, nyob rau hauv qhov tsim nyog ntawm kev txaus siab impedance tsim, peb kuj tuaj yeem xaiv los kho cov txheej txheem xaim kom tsis txhob ua lub rooj tsavxwm yim txheej, thiab xaiv los ua lub rooj tsavxwm rau lub rooj tsavxwm tiag.