Tsim lub Circuitry Design
Loj PCB (Printed Circuit Board) kev tsim hluav taws xob yuav tsum ua tib zoo npaj thiab txiav txim siab txog qhov haujlwm tshwj xeeb. Peb yuav tsum tsim ib daim duab schematic, nteg tawm PCB, txheeb xyuas, thiab tsim cov ntaub ntawv thiab Gerber los tswj cov txheej txheem tsim khoom PCB. Cov no yog cov txheej txheem tseem ceeb los ua. Siv cov kev ntsuas no, koj tuaj yeem xyuas kom meej tias PCB muaj chaw txaus rau kev khiav, kev tswj xyuas thermal, thiab tag nrho cov khoom yuav tsum tau ua.
Circuit Board Txheej
Ib qho tseem ceeb ntawm PCB tsim thiab tsim khoom loj yog Circuit Board stacking. Nws cuam tshuam cov nqi tsim khoom, kev tswj xyuas qhov kub thiab txias, teeb pom kev ncaj ncees, thiab kev ua haujlwm hluav taws xob. Lub impedance, capacitance, thiab inductance ntawm cov kab thiab kev sib txuas tuaj yeem nyob ntawm qhov tuab thiab qhov sib txawv ntawm cov txheej tooj liab, uas tuaj yeem cuam tshuam cov teeb liab zoo thiab kev ua haujlwm ntawm tag nrho. Tsis tas li ntawd, teeb liab kev ncaj ncees, uas yog qhov tseem ceeb rau kev kub ceev digital thiab analog circuits, tuaj yeem cuam tshuam los ntawm kev sib tsoo. Yog li ntawd, txheej txheej stackup yuav tsum lav qhov hluav taws xob ua tau zoo txaus siab rau qhov project xav tau.
Kev ua tau zoo ntawm hluav taws xob, teeb liab kev ncaj ncees, kev tswj xyuas thermal, thiab kev tsim cov nqi tsim khoom yog tag nrho cov cuam tshuam los ntawm Circuit Board stacking. Nws ua rau nws yog ib qho tseem ceeb ntawm PCB tsim thiab tsim khoom loj. Txawm li cas los xij, cov teeb meem no yuav txo tau, thiab cov txheej txheem txheej txheej tsim nyog tuaj yeem lav tau tias PCB ua tiav qhov tsim nyog cov teeb liab kev ntseeg siab.
Drilling qhov
Cov PCBs loj yuav tsum dhau los ntawm cov txheej txheem tseem ceeb hu ua drilling qhov kom txuas cov khoom sib txuas thiab tsim kev sib txuas ntawm pawg thawj coj saib ntau txheej. Txhawm rau lav qhov kev ua kom zoo ntawm cov txheej txheem drilling rau qhov project tshwj xeeb, nws yog ib qho tseem ceeb uas yuav tsum xav txog qhov loj thiab qhov tob, qhov chaw, cov txheej txheem drilling, kev tswj kom zoo, thiab ua haujlwm nrog cov neeg ua haujlwm paub txog PCB. Tsis tas li ntawd, peb yuav tsum xav txog qhov loj thiab qhov chaw ntawm lub qhov nrog rau cov txheej txheem drilling nws tus kheej.
Silk-screening
Cov txheej txheem saum toj kawg nkaus ntawm PCB, lub npov txhob lo lo ntxhuav, yog cov lus qhia siv rau kev tso cov khoom ntawm lub rooj tsavxwm. Yog li ntawd, nws xav tau ib tus cwj mem tsim tshwj xeeb uas tuaj ntawm ntau yam xim tab sis feem ntau yog dawb. Nws kuj tuaj yeem yog liab, dub, daj, lossis xiav. PCB pawg thawj coj saib cov ntaub ntawv tseem ceeb, xws li cov khoom tseem ceeb, cov lej, qhov chaw kuaj, thiab polarity, tau teev nyob rau ntawm lub vijtsam txhob lo lo ntxhuav los pab / pab cov neeg siv thaum sib dhos. Liquid Diam duab imaging (LPI), phau ntawv tshuaj ntsuam luam ntawv, thiab cov lus dab neeg ncaj qha luam ntawv yog cov txheej txheem tseem ceeb rau kev ntxiv cov xim lo lo ntxhuav rau PCB (DLP). Txawm hais tias nws yog txoj hauv kev zoo tshaj plaws, ntxiv cov silk-screen yog kim heev.
Bare-board test
Ua ntej muab cov khoom xws li ICs rau ntawm lub rooj tsav xwm liab qab, koj txheeb xyuas qhov kev sib cais thiab txuas ntxiv ntawm cov hluav taws xob sib txuas. Qhov no yog hu ua "bare board testing." Nws yuav tsum tau ua kom tsis muaj qhov qhib hauv Circuit Court thiab tias qhov yuav tsum tau muaj kev tiv thaiv ntawm ob qhov kev sib txuas hluav taws xob txaus siab. Peb ua cov kev xeem no nrog qhov pib ntawm 10 thiab 50 ohms thiab qis dua 100 milliamps.
Lub "txaj ntawm cov ntsia hlau" tester thiab "flying probe tester" yog ob yam tseem ceeb ntawm cov khoom siv kuaj ntshav qab zib. Ib qho tshwj xeeb contraption hu ua lub txaj ntawm tes tester tuav lub PCB nyob rau hauv qhov chaw thaum kuaj nws siv ib tug tshwj xeeb txheej ntawm caij nplooj ntoos hlav-loaded pogo pins. Kev sojntsuam ya ya siv ob lossis ntau dua "flying probes" los glide hla lub rooj tsavxwm saum npoo thiab sim txhua lub net yam tsis tas yuav muaj qhov tshwj xeeb rau lub voj voog. Hmoov tsis zoo, nws xav tau kev nqis peev nyiaj txiag tseem ceeb, kev tsim kho tshiab, thiab ib qho ntawm pogo pins rau txhua tus PCB, uas ua rau nws qeeb qeeb thiab tsis hloov pauv.
Kev sib dhos
Txhawm rau lav tias lub tsev PCB ua haujlwm tau zoo thiab tsis muaj teeb meem nrog cov khoom lossis cov khoom siv, yuav tsum muaj kev tswj xyuas zoo. Kev ntsuam xyuas yog ib theem tseem ceeb thoob plaws hauv cov txheej txheem sib dhos uas yuav xav tau cov cuab yeej tshwj xeeb thiab cov txheej txheem. Kev koom tes nrog tus tsim PCB paub zoo tuaj yeem pab txhim kho cov txheej txheem sib dhos rau txoj haujlwm tshwj xeeb.
