tooj liab yog dab tsi?
Lub npe hu ua tooj liab ncuav yog siv qhov chaw tsis siv ntawm lub rooj tsav xwm hauv Circuit Court ua ib qho chaw siv thiab tom qab ntawd sau nrog cov khoom tooj liab.Cov chaw tooj liab no tseem hu ua tooj liab filling.
Qhov tseem ceeb ntawm cov txheej tooj liab yog txhawm rau txo qhov impedance ntawm cov xaim hauv av thiab txhim kho lub peev xwm tiv thaiv kev cuam tshuam;txo qhov hluav taws xob poob thiab txhim kho kev ua haujlwm ntawm lub zog hluav taws xob;txuas nrog hauv av xaim kuj tuaj yeem txo qhov voj voog.
Tsis tas li ntawd rau lub hom phiaj ntawm kev ua kom lub PCB tsis muaj kev cuam tshuam li sai tau thaum lub sij hawm soldering, feem ntau cov tuam txhab PCB tseem yuav xav kom cov neeg tsim khoom PCB sau cov chaw qhib ntawm PCB nrog tooj liab lossis kab sib chaws zoo li hauv av.Yog tias cov tooj liab tsis ua haujlwm zoo, nws yuav Yog tias qhov nce tsis tsim nyog rau qhov poob, puas yog cov txheej tooj liab "ntau qhov zoo dua qhov tsis zoo" lossis "qhov tsis zoo tshaj qhov zoo"?
Txhua tus paub tias nyob rau hauv cov xwm txheej siab, qhov kev faib tawm ntawm cov xaim ntawm cov ntawv luam tawm yuav ua haujlwm.Thaum qhov ntev ntau dua 1/20 ntawm qhov sib thooj ntawm lub suab nrov zaus, cov nyhuv kav hlau txais xov yuav tshwm sim, thiab lub suab nrov yuav tawm los ntawm cov xov hlau.Yog tias muaj qhov tsis zoo ntawm cov tooj liab hauv PCB, cov tooj liab nchuav ua ib qho cuab yeej rau kev nthuav tawm suab nrov.
Yog li ntawd, nyob rau hauv ib tug high-frequency Circuit Court, tsis txhob xav hais tias ib tug av xaim txuas nrog rau hauv av.Qhov no yog hu ua "ground wire".Nws yog ib qho tsim nyog yuav tsum tau punch qhov hauv cov xaim nrog qhov sib nrug tsawg dua λ/20.Lub dav hlau hauv av ntawm laminate yog "zoo av".Yog tias cov txheej txheem tooj liab raug tswj kom zoo, cov txheej tooj liab tsis tsuas yog nce qhov tam sim no, tab sis kuj tseem ua lub luag haujlwm ntawm kev tiv thaiv kev cuam tshuam.
Ob hom ntawm tooj liab txheej
Feem ntau muaj ob txoj hauv kev rau txheej tooj liab, uas yog thaj tsam loj tooj liab txheej thiab daim phiaj tooj liab.Nws feem ntau nug seb puas yog qhov loj-tawg tooj liab txheej zoo dua li daim phiaj tooj liab txheej.Nws tsis zoo rau generalize.
vim li cas?Qhov loj-chaw tooj liab txheej muaj ob txoj haujlwm ntawm kev nce tam sim no thiab kev tiv thaiv, tab sis yog tias thaj chaw loj tooj liab siv rau yoj soldering, lub rooj tsavxwm tuaj yeem nqa thiab txawm tias hlwv.Yog li ntawd, rau thaj tsam loj ntawm tooj liab txheej, ob peb grooves feem ntau yog qhib los daws cov hlwv ntawm cov ntawv ci tooj liab.Raws li qhia hauv qab no:
Cov ntshiab tooj liab-clad daim phiaj feem ntau yog siv rau kev tiv thaiv, thiab cov nyhuv ntawm kev nce tam sim no raug txo.Los ntawm kev xav ntawm cov cua kub dissipation, daim phiaj zoo (nws txo cov cua sov ntawm tooj liab) thiab ua lub luag haujlwm hauv electromagnetic shielding.Tshwj xeeb tshaj yog rau circuits xws li kov, raws li qhia hauv qab no:
Nws yuav tsum tau muab sau tseg tias daim phiaj yog ua los ntawm cov kab nyob rau hauv staggered cov lus qhia.Peb paub tias rau lub voj voog, qhov dav ntawm cov kab muaj qhov sib thooj "hluav taws xob ntev" rau kev khiav hauj lwm zaus ntawm lub rooj tsavxwm Circuit Court (qhov loj me yog muab faib los ntawm cov zaus digital sib txuas nrog cov zaus ua haujlwm, saib cov phau ntawv muaj feem xyuam rau cov ntsiab lus. ).
Thaum qhov kev khiav hauj lwm zaus tsis siab heev, tej zaum cov nyhuv ntawm cov kab sib chaws tsis pom tseeb heev.Thaum qhov hluav taws xob ntev sib npaug ntawm qhov kev khiav hauj lwm zaus, nws yuav ua phem heev.Koj yuav pom tias lub voj voog tsis ua haujlwm zoo txhua qhov, thiab lub kaw lus tau cuam tshuam txhua qhov chaw.teeb liab ntawm.
Cov lus qhia yog xaiv raws li kev ua haujlwm ntawm lub rooj tsavxwm tsim, tsis txhob tuav ib yam dab tsi.Yog li ntawd, high-frequency circuits muaj cov kev xav tau siab rau ntau lub hom phiaj rau kev tiv thaiv kev cuam tshuam, thiab cov hluav taws xob tsis tshua muaj hluav taws xob muaj cov hluav taws xob loj, xws li feem ntau siv ua tiav tooj liab.