Txhawm rau ua kom tau zoo PCB tsim, ntxiv rau tag nrho cov txheej txheem kev teeb tsa, cov kev cai rau kab dav thiab qhov sib txawv kuj tseem ceeb heev.Tias yog vim li cas kab dav thiab qhov sib txawv txiav txim siab qhov kev ua tau zoo thiab kev ruaj ntseg ntawm lub rooj tsav xwm Circuit Court.Yog li ntawd, tsab xov xwm no yuav muab cov ncauj lus qhia ntxaws ntxaws txog kev tsim qauv dav dav rau PCB kab dav thiab qhov sib nrug.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov software default settings yuav tsum raug teeb tsa kom raug thiab qhov kev xaiv Tsim Txoj Cai Tswj Xyuas (DRC) yuav tsum tau qhib ua ntej routing.Nws raug nquahu kom siv 5mil daim phiaj rau routing, thiab rau qhov sib npaug ntawm 1mil daim phiaj tuaj yeem teeb tsa raws li qhov xwm txheej.
PCB Kab Dav Txoj Cai:
1.Routing yuav tsum xub ua kom tau raws li lub peev xwm ntawm lub Hoobkas.Paub meej tias cov chaw tsim khoom tsim khoom nrog cov neeg siv khoom thiab txiav txim siab lawv lub peev xwm ntau lawm.Yog tias tsis muaj qhov tshwj xeeb yuav tsum tau muab los ntawm cov neeg siv khoom, xa mus rau impedance tsim qauv rau kab dav.
2.Impedance templates: Raws li muab board thickness thiab txheej yuav tsum tau los ntawm tus neeg muas zaub, xaiv tus tsim impedance qauv.Teem cov kab dav raws li xam qhov dav hauv cov qauv impedance.Feem ntau impedance qhov tseem ceeb muaj xws li ib leeg-kawg 50Ω, sib txawv 90Ω, 100Ω, thiab lwm yam. Nco ntsoov seb lub 50Ω kav hlau txais xov teeb liab yuav tsum xav txog kev siv rau cov txheej uas nyob ib sab.Rau ntau PCB txheej stackups raws li siv hauv qab no.
3.Raws li qhia hauv daim duab hauv qab no, kab dav yuav tsum ua tau raws li qhov yuav tsum tau muaj peev xwm nqa tau tam sim no.Feem ntau, raws li kev paub dhau los thiab kev txiav txim siab cov kab sib txuas, lub zog kab dav tsim tuaj yeem txiav txim siab los ntawm cov lus qhia hauv qab no: Rau qhov kub thiab txias ntawm 10 ° C, nrog 1oz tooj liab thickness, 20mil kab dav tuaj yeem tswj tau qhov overload tam sim no ntawm 1A;rau 0.5oz tooj liab tuab, 40mil kab dav tuaj yeem ua haujlwm dhau ntawm 1A.
4. Rau kev tsim qauv dav dav, txoj kab dav yuav tsum zoo dua yog tswj tau siab tshaj 4mil, uas tuaj yeem ua tau raws li kev tsim muaj peev xwm ntawm cov tuam txhab PCB feem ntau.Rau cov qauv tsim uas tsis tsim nyog tswj impedance (feem ntau 2-txheej boards), tsim ib kab dav saum 8mil tuaj yeem pab txo cov nqi tsim khoom ntawm PCB.
5. Xav txog qhov chaw ntawm tooj liab thickness rau cov txheej txheem nyob rau hauv routing.Siv 2oz tooj liab piv txwv, sim tsim cov kab dav saum 6mil.Qhov tuab ntawm tooj liab, qhov dav ntawm txoj kab dav dav.Nug txog kev tsim khoom ntawm lub Hoobkas rau cov qauv tsis yog tus qauv tooj liab tuab.
6. Rau BGA tsim nrog 0.5mm thiab 0.65mm pitches, 3.5mil kab dav siv tau rau qee qhov chaw (tuaj yeem tswj tau los ntawm kev tsim qauv).
7. HDI board tsim siv tau 3mil kab dav.Rau cov qauv tsim nrog kab dav hauv qab 3mil, nws yog ib qho tsim nyog kom paub meej tias lub peev xwm tsim khoom ntawm lub Hoobkas nrog cov neeg siv khoom, vim qee cov tuam txhab tuaj yeem muaj peev xwm tsuas yog 2mil kab dav (tuaj yeem tswj tau los ntawm kev tsim qauv).Thinner kab dav nce nqi tsim khoom thiab txuas ntxiv lub voj voog ntau lawm.
8. Analog signals (xws li suab thiab video signals) yuav tsum tau tsim nrog cov kab tuab, feem ntau nyob ib ncig ntawm 15mil.Yog tias qhov chaw txwv tsis pub, kab dav yuav tsum tswj tau siab tshaj 8mil.
9. Cov teeb liab RF yuav tsum tau ua nrog cov kab tuab, nrog rau kev siv cov khaubncaws sab nraud povtseg thiab impedance tswj ntawm 50Ω.RF teeb liab yuav tsum tau ua tiav ntawm cov txheej txheej sab nrauv, zam cov txheej txheem sab hauv thiab txo qis kev siv vias lossis txheej hloov.RF cov cim qhia yuav tsum nyob ib puag ncig los ntawm lub dav hlau hauv av, nrog rau cov txheej txheem siv tau zoo dua yog GND tooj liab.
Cov cai ntawm PCB Wiring Line Spacing Rules
1. Cov xaim yuav tsum xub ua kom tau raws li lub peev xwm ntawm lub Hoobkas, thiab cov kab sib txuas yuav tsum ua tau raws li lub peev xwm ntawm lub Hoobkas, feem ntau tswj ntawm 4 mil lossis siab dua.Rau BGA tsim nrog 0.5mm lossis 0.65mm qhov sib nrug, ib kab sib nrug ntawm 3.5 mil tuaj yeem siv rau qee qhov chaw.HDI tsim tuaj yeem xaiv kab sib nrug ntawm 3 mil.Cov qauv tsim hauv qab 3 mil yuav tsum paub meej tias lub peev xwm ntawm cov khoom tsim nrog cov neeg siv khoom.Qee lub tuam txhab muaj peev xwm tsim tau 2 mil (tswj hauv cov qauv tsim tshwj xeeb).
2. Ua ntej tsim txoj cai kab sib nrug, xav txog qhov xav tau ntawm tooj liab thickness ntawm tus tsim.Rau 1 ooj tooj liab sim tswj qhov kev ncua deb ntawm 4 mil lossis siab dua, thiab rau 2 ounce tooj liab, sim tswj qhov deb ntawm 6 mil lossis siab dua.
3. Qhov kev ncua deb tsim rau cov teeb liab sib txawv yuav tsum tau teeb tsa raws li impedance yuav tsum tau ua kom muaj qhov sib txawv kom zoo.
4. Cov xaim yuav tsum tau khaws cia kom deb ntawm lub rooj tsavxwm thiab sim xyuas kom meej tias lub rooj tsavxwm tuaj yeem muaj av (GND) vias.Khaws qhov kev ncua deb ntawm cov teeb liab thiab board ntug saum 40 mil.
5. Lub hwj chim txheej teeb liab yuav tsum muaj qhov deb ntawm tsawg kawg yog 10 mil los ntawm GND txheej.Qhov kev ncua deb ntawm lub hwj chim thiab lub zog tooj liab dav hlau yuav tsum yog tsawg kawg yog 10 mil.Rau qee qhov ICs (xws li BGAs) nrog qhov sib nrug me me, qhov kev ncua deb tuaj yeem hloov kho kom haum rau qhov tsawg kawg nkaus ntawm 6 mil (tswj hauv cov qauv tsim tshwj xeeb).
6. Cov cim tseem ceeb xws li moos, qhov sib txawv, thiab cov cim analog yuav tsum muaj qhov deb ntawm 3 npaug ntawm qhov dav (3W) lossis nyob ib puag ncig hauv av (GND) dav hlau.Qhov kev ncua deb ntawm kab yuav tsum khaws cia ntawm 3 npaug ntawm kab dav kom txo tau crosstalk.Yog tias qhov kev ncua deb ntawm cov chaw ntawm ob kab tsis tsawg dua 3 npaug ntawm kab dav, nws tuaj yeem tswj tau 70% ntawm cov hluav taws xob hluav taws xob ntawm cov kab uas tsis muaj kev cuam tshuam, uas yog hu ua 3W txoj cai.
7.Adjacent txheej teeb liab yuav tsum zam kom tsis txhob muaj kab sib txuas.Cov kev taw qhia routing yuav tsum tsim ib qho qauv orthogonal kom txo qis interlayer crosstalk tsis tsim nyog.
8. Thaum routing nyob rau saum npoo txheej, kom ib tug deb ntawm tsawg kawg yog 1 hli los ntawm lub mounting qhov los tiv thaiv luv luv circuits los yog kab tearing vim installation kev nyuaj siab.Qhov chaw nyob ib ncig ntawm lub qhov taub yuav tsum tau ceev kom meej.
9. Thaum faib cov txheej txheem fais fab, tsis txhob sib faib ntau dhau.Nyob rau hauv ib lub dav hlau fais fab, sim kom tsis txhob muaj ntau tshaj 5 lub zog teeb liab, zoo dua nyob rau hauv 3 lub zog teeb liab, kom ntseeg tau tias muaj peev xwm nqa tam sim no thiab zam qhov kev pheej hmoo ntawm cov teeb liab hla lub dav hlau sib cais ntawm cov khaubncaws sab nraud povtseg.
10. Fais fab kev faib dav hlau yuav tsum tau khaws cia kom tsis tu ncua raws li qhov ua tau, tsis muaj qhov ntev lossis dumbbell-puab faib, kom tsis txhob muaj cov xwm txheej uas qhov kawg loj thiab qhov nruab nrab me me.Lub peev xwm nqa tam sim no yuav tsum tau xam raws li qhov dav dav dav ntawm lub zog tooj liab dav hlau.
Shenzhen ANKE PCB Co., Ltd
2023-9-16
Post lub sij hawm: Sep-19-2023
