Qhov no txhais li cas rau kev lag luam high-speed PCB?
Ua ntej tshaj plaws, thaum tsim thiab tsim PCB pawg, cov khoom siv yuav tsum tau ua ntej. 5G PCBs yuav tsum ua kom tau raws li tag nrho cov kev qhia tshwj xeeb thaum nqa thiab txais cov teeb liab kis tau tus mob, muab kev sib txuas hluav taws xob, thiab muab kev tswj hwm rau cov haujlwm tshwj xeeb. Tsis tas li ntawd, PCB tsim cov teeb meem yuav tsum tau daws, xws li kev tswj cov teeb liab kev ncaj ncees ntawm kev nrawm dua, kev tswj xyuas thermal, thiab yuav ua li cas tiv thaiv electromagnetic cuam tshuam (EMI) ntawm cov ntaub ntawv thiab cov laug cam.
Mixed signal txais Circuit Board tsim
Niaj hnub no, feem ntau cov tshuab tau cuam tshuam nrog 4G thiab 3G PCBs. Qhov no txhais tau hais tias cov khoom sib kis thiab tau txais ntau zaus yog 600 MHz txog 5.925 GHz, thiab bandwidth channel yog 20 MHz, lossis 200 kHz rau IoT systems. Thaum tsim PCBs rau 5G network systems, cov khoom no yuav xav tau millimeter yoj zaus ntawm 28 GHz, 30 GHz lossis txawm 77 GHz, nyob ntawm daim ntawv thov. Rau bandwidth raws, 5G systems yuav ua 100MHz hauv qab 6GHz thiab 400MHz saum 6GHz.
Cov kev nrawm dua thiab cov zaus ntau dua no yuav xav tau kev siv cov ntaub ntawv tsim nyog hauv PCB rau ib txhij ntes thiab xa cov cim qis thiab siab dua yam tsis muaj teeb liab poob thiab EMI. Lwm qhov teeb meem yog tias cov khoom siv yuav sib dua, nqa tau yooj yim dua, thiab me dua. Vim qhov hnyav hnyav, qhov loj me thiab qhov chaw txwv, cov khoom siv PCB yuav tsum hloov tau yooj yim thiab lub teeb yuag kom haum rau txhua yam khoom siv microelectronic ntawm lub rooj tsavxwm.
Rau PCB tooj liab kab, cov kab nyias nyias thiab kev tswj hwm nruj dua yuav tsum tau ua raws. Cov txheej txheem rho tawm ib txwm siv rau 3G thiab 4G high-speed PCBs tuaj yeem hloov mus rau cov txheej txheem hloov kho ib nrab ntxiv. Cov txheej txheem semi-additive txhim kho no yuav muab cov kab ntau meej thiab cov phab ntsa ncaj.
Cov ntaub ntawv hauv paus tseem raug kho dua tshiab. Cov tuam txhab luam tawm Circuit Board tab tom kawm cov ntaub ntawv nrog lub dielectric tas li tsawg li 3, vim tias cov ntaub ntawv txheem rau PCBs qis feem ntau yog 3.5 txog 5.5. Tighter iav fiber ntau braid, txo qhov tsis zoo ntawm cov khoom poob thiab qis profile tooj liab kuj yuav dhau los ua kev xaiv ntawm PCB high-speed PCB rau cov teeb liab digital, yog li tiv thaiv cov teeb liab poob thiab txhim kho teeb liab kev ncaj ncees.
EMI tiv thaiv teeb meem
EMI, crosstalk thiab parasitic capacitance yog cov teeb meem tseem ceeb ntawm Circuit Court boards. Txhawm rau cuam tshuam nrog crosstalk thiab EMI vim yog cov analog thiab digital zaus ntawm lub rooj tsavxwm, nws raug pom zoo kom cais cov kab. Kev siv cov boards multilayer yuav muab ntau yam zoo dua los txiav txim siab yuav ua li cas tso cov kab nrawm nrawm kom txoj hauv kev ntawm analog thiab digital xa rov qab cov cim tseg kom deb ntawm ib leeg, thaum khaws cov AC thiab DC circuits cais. Ntxiv kev tiv thaiv thiab kev lim dej thaum muab cov khoom siv yuav tsum txo qis EMI ntawm lub PCB.
Txhawm rau kom ntseeg tau tias tsis muaj qhov tsis xws luag thiab luv luv Circuit Court lossis qhib Circuit Court ntawm tooj liab, qhov kev tshuaj ntsuam xyuas qhov muag tsis zoo (AIO) nrog cov haujlwm siab dua thiab 2D metrology yuav raug siv los xyuas cov neeg xyuas pib thiab ntsuas lawv. Cov thev naus laus zis no yuav pab PCB cov tuam txhab nrhiav kev pheej hmoo ntawm cov teeb liab degradation.
Cov kev sib tw thermal tswj
Lub teeb liab siab dua yuav ua rau tam sim no los ntawm PCB los ua kom muaj cua sov ntau dua. PCB cov ntaub ntawv rau cov khoom siv hluav taws xob thiab cov txheej txheem hauv qab yuav tsum tau ua kom txaus rau cov kev kub ceev uas xav tau los ntawm 5G thev naus laus zis. Yog tias cov khoom siv tsis txaus, nws tuaj yeem ua rau tooj liab, tev, shrinkage thiab warping, vim tias cov teeb meem no yuav ua rau PCB tsis zoo.
Txhawm rau tiv thaiv qhov kub siab dua no, cov tuam txhab yuav tsum tau tsom mus rau kev xaiv cov khoom siv los daws cov teeb meem thermal conductivity thiab thermal coefficient. Cov ntaub ntawv uas muaj thermal conductivity ntau dua, kev hloov pauv cua sov zoo, thiab cov khoom siv hluav taws xob zoo ib yam yuav tsum tau siv los ua ib lub PCB zoo los muab tag nrho 5G nta uas xav tau rau daim ntawv thov no.