6 Txheej FR4 ENIG Impedance Control PCB
PCB Impedance Kab Tsim
1.Nyob rau hauv cov txheej txheem ntawm PCB LAYOUT, xav txog cov txheej txheem yooj yim uas yuav tsum tau tswj cov impedance yog: kab dav, kab nrug, kab ntev, impedance kab shielding siv txheej, raws li cov kev cai no yuav muab tso rau hauv qhov tsim nyog ntawm txoj kab impedance. .
2. Lub shielding reference txheej nyiam xaiv cov kab uas nyob ib sab mus rau txheej uas cov kab impedance nyob.Txoj hauj lwm sib thooj ntawm cov kab impedance yog ib daim ntawv tooj liab ua tiav, txhawm rau xyuas kom meej tias qhov sib txawv ntawm tus nqi impedance yog tswj tau.Hauv kev tsim khoom tiag tiag, raws li kev tsim qauv LAYOUT, qhov ze tshaj plaws ntawm daim ntawv tooj liab rau cov kab impedance yog xaiv raws li cov txheej txheem siv.Yog tias tsis muaj daim ntawv tooj liab nyob rau hauv txoj hauj lwm sib raug, lub impedance tsis tuaj yeem tswj tau.Yog tias daim ntawv tooj liab tsis tuaj yeem tiv thaiv kab impedance tag nrho, impedance sib txawv tsis tuaj yeem tswj tau.
3, Kev faib tawm ntawm txoj kab impedance tshwj xeeb: cov yam ntxwv impedance tsuas yog ib kab xwb, tsuas yog xav txog cov kab dav thiab qhov ntev ntawm txoj kab.Differential impedances yuav tsum muaj ob kab ntawm tib kab dav tag nrho mus rau ib leeg.Coplanar impedance yog kev sib cuam tshuam ntawm txoj kab thiab hauv av tooj liab, yog li txoj kab dav yuav tsum zoo ib yam, ob sab ntawm txoj kab yog ib puag ncig los ntawm av tooj liab, thiab qhov kev ncua deb ntawm txoj kab mus rau hauv av tooj liab yog tib yam los ntawm pib mus xaus.
Dab tsi yog Impedance Control ntawm PCB siv rau?
Tswj impedance yog qhov zoo dua thaum lub teeb liab yuav tsum muaj qee yam impedance ua haujlwm kom zoo.Hauv kev siv ntau zaus, ib qho impedance tas li yuav tsum tau khaws cia thoob plaws hauv lub rooj tsavxwm kom ntseeg tau tias kev ncaj ncees ntawm cov ntaub ntawv xa mus thiab qhov tseeb ntawm lub teeb liab.Qhov ntev ntawm tus neeg xyuas pib txoj kev lossis qhov siab dua, qhov kev hloov kho ntau dua yuav tsum tau ua.Tsis muaj kev nruj ntawm qib no tuaj yeem ua rau lub sijhawm hloov pauv ntawm cov khoom siv hluav taws xob lossis hluav taws xob hluav taws xob thiab ua rau muaj kev xav tsis thoob.
Uncontrolled impedance yog qhov nyuaj rau kev txheeb xyuas tom qab cov khoom sib sau ua ke ntawm lub voj voog.Cheebtsam muaj qhov kam rau ua ntau yam nyob ntawm qhov ntau.Tsis tas li ntawd, lawv cov yam ntxwv tuaj yeem cuam tshuam los ntawm qhov kub thiab txias, uas tuaj yeem ua rau muaj kev ua haujlwm tsis zoo.Nyob rau hauv cov ntaub ntawv no, hloov lub Cheebtsam zoo li cov kev daws teeb meem, tab sis qhov tseeb nws yog tsis txaus impedance ntawm tus neeg xyuas pib xaim uas yog qhov teeb meem.
Yog li ntawd, PCB tsim yuav tsum tau xyuas cov neeg xyuas pib thaiv impedance thiab nws kam rau ua ua ntej kom ntseeg tau tias cov khoom muaj nqis raws li qhov yuav tsum tau ua.
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