5. kev xaiv ntawm cov khoom
Kev xaiv ntawm cov khoom siv yuav tsum tau ua tiav tag nrho ntawm thaj chaw tiag tiag ntawm PCB, kom deb li deb tau, kev siv cov khoom sib xyaw ua ke.Tsis txhob ua qhov muag tsis pom cov khoom me me kom tsis txhob muaj cov nqi nce ntxiv, IC cov cuab yeej yuav tsum tau them sai sai rau tus pin puab thiab ko taw qhov sib nrug, QFP tsawg dua 0.5 hli ko taw sib nrug yuav tsum tau ua tib zoo xav, tsis yog xaiv ncaj qha rau BGA pob khoom siv.Tsis tas li ntawd, daim ntawv ntim ntawm cov khoom, qhov kawg electrode loj, solderability, kev ntseeg siab ntawm cov cuab yeej, kub kam rau siab xws li seb nws puas tuaj yeem hloov kho raws li qhov xav tau ntawm cov hlau lead-dawb soldering) yuav tsum tau muab coj los rau hauv tus account.
Tom qab xaiv cov khoom, koj yuav tsum tsim kom muaj cov ntaub ntawv zoo ntawm cov khoom, suav nrog qhov loj me, tus pin loj thiab cov chaw tsim khoom ntawm cov ntaub ntawv cuam tshuam.
6. kev xaiv ntawm PCB substrates
Lub substrate yuav tsum tau xaiv raws li cov kev cai ntawm kev siv ntawm PCB thiab mechanical thiab hluav taws xob kev ua tau zoo;Raws li cov qauv ntawm cov ntawv luam tawm los txiav txim seb tus naj npawb ntawm tooj liab-clad nto ntawm lub substrate (ib leeg-sided, ob-sided lossis multi-layer board);Raws li qhov loj ntawm lub rooj tsavxwm luam ntawv, qhov zoo ntawm chav tsev cheeb tsam bearing Cheebtsam los txiav txim lub thickness ntawm lub substrate board.Tus nqi ntawm cov khoom sib txawv sib txawv heev hauv kev xaiv PCB substrates yuav tsum xav txog cov hauv qab no:
Cov kev xav tau rau kev ua haujlwm hluav taws xob.
Tej yam xws li Tg, CTE, flatness thiab muaj peev xwm ntawm lub qhov metallization.
Nqe yam.
7. cov ntawv luam tawm Circuit Board tiv thaiv hluav taws xob cuam tshuam tsim
Rau sab nraud electromagnetic cuam tshuam, tuaj yeem daws tau los ntawm tag nrho lub tshuab tiv thaiv kev ntsuas thiab txhim kho kev tiv thaiv kev cuam tshuam ntawm Circuit Court.Electromagnetic cuam tshuam rau PCB los ua ke nws tus kheej, hauv PCB layout, thaiv kev tsim, cov kev xav hauv qab no yuav tsum tau ua:
Cheebtsam uas yuav cuam tshuam los yog cuam tshuam rau ib leeg, qhov kev teeb tsa yuav tsum nyob deb li deb tau lossis siv kev tiv thaiv kev tiv thaiv.
Cov kab hluav taws xob sib txawv ntawm qhov sib txawv, tsis txhob muab cov kab sib txuas sib txuas ze rau ib leeg ntawm cov kab hluav taws xob ntau zaus, yuav tsum tau muab tso rau ntawm nws sab lossis ob sab ntawm cov xaim hauv av rau kev tiv thaiv.
Rau high-frequency, high-ceev circuits, yuav tsum tau tsim kom deb li deb li sai tau mus rau ob-sided thiab multi-layer printed circuit board.Ob sab board ntawm ib sab ntawm kev teeb tsa ntawm cov kab teeb liab, sab nraud tuaj yeem tsim rau hauv av;multi-layer board tuaj yeem raug cuam tshuam los ntawm kev teeb tsa ntawm cov kab teeb liab ntawm cov txheej hauv av lossis txheej txheej fais fab;rau microwave circuits nrog ribbon kab, kis tau tus mob teeb liab kab yuav tsum tau nteg nruab nrab ntawm ob txheej av, thiab thickness ntawm cov xov xwm txheej nruab nrab ntawm lawv raws li xav tau kev xam.
Transistor puag cov kab luam tawm thiab cov kab hluav taws xob ntau zaus yuav tsum tau tsim kom luv li sai tau kom txo tau electromagnetic cuam tshuam los yog hluav taws xob thaum lub teeb liab kis tau tus mob.
Cov khoom sib txawv ntawm cov zaus sib txawv tsis sib koom tib txoj kab hauv av, thiab cov kab hauv av thiab lub zog ntawm cov zaus sib txawv yuav tsum tau muab tso rau nyias.
Digital circuits thiab analog circuits tsis sib koom tib txoj kab hauv av nyob rau hauv kev sib txuas nrog rau sab nraud hauv av ntawm lub rooj tsav xwm luam tawm tuaj yeem muaj kev sib cuag.
Ua hauj lwm nrog ib tug kuj loj muaj peev xwm sib txawv ntawm lub Cheebtsam los yog luam tawm kab, yuav tsum tau nce qhov kev ncua deb ntawm ib leeg.
8. thermal tsim ntawm PCB
Nrog rau qhov nce ntawm qhov ntom ntawm cov khoom sib sau ua ke ntawm cov ntawv luam tawm, yog tias koj tuaj yeem ua tsis tau zoo dissipate tshav kub raws sijhawm, yuav cuam tshuam rau kev ua haujlwm ntawm lub voj voog, thiab txawm tias kub dhau heev yuav ua rau cov khoom ua tsis tiav, yog li cov teeb meem thermal. ntawm cov ntawv luam tawm, cov qauv tsim yuav tsum tau ua tib zoo xav txog, feem ntau siv cov kev ntsuas hauv qab no:
Ua kom thaj tsam ntawm cov ntawv ci tooj liab ntawm cov ntawv luam tawm nrog cov khoom siv hluav taws xob siab hauv av.
Cov khoom siv hluav taws xob ua hluav taws xob tsis tau muab tso rau ntawm lub rooj tsavxwm, lossis cov dab dej ntxiv.
rau multilayer boards lub puab hauv av yuav tsum tau tsim raws li ib tug net thiab ze rau ntawm ntug ntawm lub rooj tsavxwm.
Xaiv cov nplaim-retardant lossis kub-resistant hom ntawm lub rooj tsavxwm.
9. PCB yuav tsum tau ua puag ncig
Lub kaum sab xis PCB yog qhov yooj yim rau jamming thaum lub sij hawm kis tau tus mob, yog li nyob rau hauv lub tsim ntawm lub PCB, lub board ncej yuav tsum tau ua rounded ces kaum, raws li qhov luaj li cas ntawm lub PCB los txiav txim lub vojvoog ntawm lub rounded fab.Daim board thiab ntxiv auxiliary ntug ntawm PCB nyob rau hauv lub auxiliary ntug ua rounded ces kaum.
Post lub sij hawm: Feb-21-2022