Raws li paub zoo, kev tswj hwm impedance yog lub hauv paus ntsiab lus tseem ceeb tshaj plaws hauv peb cov qauv kev kub ceev. Tam sim no, cov chaw tsim khoom vaj huam sib luag tswj hwm qhov cuam tshuam rau qhov yuam kev ntawm 10%, thiab ntau tus phooj ywg tej zaum yuav muaj lus nug, vim li cas nws yog 10%? Hauv txoj kev xav, qhov yuam kev me me, qhov zoo dua, yog li vim li cas ho tsis ntxiv qhov kev tswj hwm kev muaj peev xwm mus txog 8%, lossis txawm tias 5%?
Muaj ntau yam cuam tshuam rau impedance ntawm PCB thaiv, feem ntau suav nrog qhov dav thiab tuab ntawm cov hlau tooj liab, qhov dielectric qhov nruab nrab, qhov tuab ntawm qhov nruab nrab, thiab lub thickness ntawm lub npog ntsej muag. Yog li ntawd, txhawm rau txo qis qhov yuam kev impedance, nws yog ib qho tsim nyog los tswj cov kev ua yuam kev ntawm ntau yam uas tau hais los saum toj no zoo heev thaum lub sijhawm ua cov txheej txheem PCB, txhawm rau kom ua tiav qhov yuam kev me me impedance. Tab sis saib ntawm cov txheej txheem PCB ib kauj ruam dhau los, koj yuav pom tias yuav luag txhua tus txheej txheem ua qhov yuam kev hauv kev tswj hwm ntawm cov kab sib kis, thiab qee cov txheej txheem kuj tseem muaj qhov tsis sib xws. Yog li ntawd, tus nqi ntawm 10% yog qhov zoo tshaj plaws tus nqi uas tuaj yeem ua tiav los ntawm lub Hoobkas tom qab txiav txim siab ntau yam yuam kev. Thiab 8% lossis txawm tias 5% yog qhov nyuaj heev kom ua tiav.
Qhov nyuaj 1: Cov nyhuv iav fiber ntau
Los ntawm daim ntawv hlais ntawm PCB lub rooj tsavxwm, nws tuaj yeem pom tau tias PCB nruab nrab (txawm nws yog cov ntawv tseem ceeb lossis PP ntawv) yog tsim los ntawm ob ntu, suav nrog fiberglass daim ntaub (fiberglass daim ntaub) thiab resin. Ntawm lawv, fiberglass daim ntaub zoo li lub cev pob txha, ua lub luag haujlwm hauv kev ua kom muaj zog thiab kev txhawb nqa, thaum cov resin zoo li cov kua nplaum, ua si ib qho kev sib raug zoo. Cov iav fiber ntau yog dab tsi? Cov nyhuv iav fiber ntau yog tshwm sim los ntawm qhov sib txawv dielectric tas li ntawm iav fiber ntau daim ntaub thiab cob. Feem ntau hais lus, lub dielectric tas li ntawm fiberglass daim ntaub yog nyob ib ncig ntawm 6, thaum lub resin kuj yog tsawg, feem ntau ntawm 2 thiab 3. Ntawm no, txoj hauj lwm ntawm cov kab sib txawv ntawm daim ntaub fiberglass ua ib qho tseem ceeb heev: thaum nws ntog ntawm qhov khoob. qhov rais los yog ntawm daim ntaub, qhov sib txuam impedance sib txawv yog qhov tseem ceeb, uas nyob rau hauv lem ua rau impedance yuam kev. Cov qauv ntawm cov iav fiber ntau zoo tib yam: Qhov cuam tshuam ntawm qhov khoob qhov rais iav fiber ntau cuam tshuam rau impedance feem ntau yog vim cov xaim yuav poob rau ntawm lub qhov rais khoob lossis ntawm daim ntaub iav fiber ntau. Vim qhov sib txawv ntawm dielectric tas li ntawm ob, lub impedance tso tawm yuav tsum sib txawv. Hauv kev tsim khoom tiag tiag, txawm tias cov xaim yuav poob rau ntawm lub qhov rais khoob lossis ntawm daim ntaub fiberglass yog tag nrho ntawm randomness, yog li qhov kev ua yuam kev impedance tshwm sim ntawm no tsis tuaj yeem tswj tau.
Qhov nyuaj 2: Kab dav / tuab qhov tseeb yuam kev tswj
PCB kab dav yog ib qho tseem ceeb cuam tshuam rau impedance: qhov loj ntawm kab dav, qhov me me ntawm impedance. Hauv kev tsim cov txheej txheem PCB, nws yog ib qho tsim nyog los tswj cov kab dav hauv 10% kam rau ua kom tau raws li qhov xav tau ntawm kev tswj impedance. Ib yam li ntawd, hlau thickness (tooj liab thickness) kuj yog ib qho tseem ceeb ntawm cov impedance: qhov loj ntawm tooj liab thickness, qhov me me impedance. Txawm li cas los xij, hauv kev tsim khoom tiag tiag, kev tswj xyuas tsis zoo hauv Circuit Court thiab loj impedance sib txawv yog cov teeb meem tshwm sim rau ntau lub tuam txhab PCB. Txhawm rau tswj xyuas qhov tseeb ntawm qhov tseeb, PCB cov tuam txhab yuav tsum muaj cov tshuab hluav taws xob zoo tshaj plaws thiab lub tshuab nqus tsev etching. Txhawm rau kom paub meej cov kab dav kom ntau li ntau tau, pawg thawj coj saib xyuas tseem yuav tsum tau them nyiaj rau engineering zaj duab xis rau cov txheej txheem raws li etching sab etching tus nqi, teeb duab yuam kev, thiab duab hloov qhov yuam kev, txhawm rau ua kom tau raws li qhov xav tau ntawm kab dav / kab. tuab.
Qhov nyuaj 3: Ua kom lub thickness ntawm qhov nruab nrab tuaj yeem ua rau impedance, thaum txo cov thickness ntawm nruab nrab tuaj yeem txo impedance.
Cov nplooj ntawv sib txawv muaj cov ntsiab lus sib txawv thiab cov tuab, yog li lub Hoobkas yuav tsum nkag siab qhov nruab nrab thickness ntawm lub rooj tsavxwm nws tus kheej; Nyob rau tib lub sijhawm, lub thickness ntawm cov ntawv xovxwm muaj feem xyuam rau qhov flatness ntawm cov xovxwm thiab qhov kev pab cuam ntawm cov ntawv xovxwm. Yog li, txhawm rau tswj qhov tuab ntawm qhov nruab nrab, qhov tseem ceeb nyob hauv kev tsim qauv engineering, kev tswj lub phaj siab, cov khoom tuaj yeem kam rau ua, thiab lwm yam. Txhua qhov teeb meem txheej txheem yuav cuam tshuam qhov kawg impedance yuam kev ntawm lub rooj tsavxwm. Tshwj xeeb tshaj yog rau siab thiab ntau txheej impedance boards, cov txheej txheem nias yog qhov tseem ceeb heev. Vim tias PP dielectric txheej yuav nthuav tawm lub xeev ntws hauv qhov kub thiab txias, nws yog ib qho tseem ceeb los tswj qhov kub, txheej txheem, thiab calibration ntawm compression. Txwv tsis pub, lub thickness sib txawv ntawm cov tiav dielectric txheej yuav cuam tshuam rau qhov tseeb ntawm tus nqi impedance.
Qhov nyuaj 4: Kev tiv thaiv vuam thickness tswj
Feem ntau, luam ntawv lub npog ntsej muag yuav txo qhov impedance ntawm txheej txheej, yog li qhov cuam tshuam ntawm lub npog ntsej muag yuav raug txiav txim siab thaum tswj cov impedance yuam kev. Raws li ib txwm muaj, luam ntawv lub npog ntsej muag ib zaug tuaj yeem txo qhov kawg ntawm 2 Ω thiab qhov sib txawv ntawm 8 Ω; Qhov txo nqi ntawm kev luam ntawv ob zaug yog ob zaug ntawm kev luam ntawv ib zaug; Thaum luam tawm ntau tshaj peb zaug, tus nqi impedance tsis hloov lawm.
Muaj ntau ntau yam uas cuam tshuam rau impedance yuam kev, ntawm cov uas ib co ua yam tseem ceeb tshaj random, uas yog vim li cas impedance yuam kev yog ib qho nyuaj mus cuag 5%. Yog li ntawd, rau kev txhim kho cov khoom, nws yuav yog ib qho tseem ceeb tsis txhob tsom rau impedance machining yuam kev ntawm 10%, 8%, los yog txawm 5% los ntawm cov txheej txheem ua, tab sis hloov peb lub hom phiaj kom tau txais ntau qhov system margin los ntawm ntau optimized. tsim ntawm PCBs los tiv thaiv machining yuam kev.
Muaj ntau ntau yam uas cuam tshuam rau impedance yuam kev, ntawm cov uas ib co ua yam tseem ceeb tshaj random, uas yog vim li cas impedance yuam kev yog ib qho nyuaj mus cuag 5%. Yog li ntawd, rau kev txhim kho cov khoom, nws yuav yog ib qho tseem ceeb tsis txhob tsom rau impedance machining yuam kev ntawm 10%, 8%, los yog txawm 5% los ntawm cov txheej txheem ua, tab sis hloov peb lub hom phiaj kom tau txais ntau qhov system margin los ntawm ntau optimized. tsim ntawm PCBs los tiv thaiv machining yuam kev.
Uniwell Circuit yog ib lub chaw tsim khoom ntawm 2-32 txheej high-precision PCB Circuit Court boards nrog ntau tshaj kaum xyoo ntawm cov txheej txheem paub tab thiab cov ntaub ntawv kev lag luam. Nyob rau tib lub sijhawm, peb kuj tau ua raws li kev lag luam thev naus laus zis txhim kho thiab txhim kho peb tus kheej cov txheej txheem tas li. Peb muaj pab pawg neeg tsim khoom nplua nuj thiab paub txog cov txheej txheem kev paub hauv cov khoom siv tawv tawv, cov txheej txheem siab ntau, thiab HDI Circuit Court boards. Peb yuav tsum kawm paub ntau ntxiv txog cov khoom siv tawv tawv, cov txheej txheem siab ntau, thiab HDI Circuit Court boards. Txais tos tiv tauj peb!