Nrhiav pcb tsim hauv Chennai?
Lub rooj tsav xwm luam tawm, lossis PCB, yog siv los txhawb kev siv tshuab thiab hluav taws xob sib txuas cov khoom siv hluav taws xob siv cov kab hluav taws xob, kev taug qab lossis cov teeb liab etched los ntawm cov ntawv tooj liab laminated mus rau qhov tsis muaj hluav taws xob substrate. Nws tseem hu ua printed wiring board (PWB) los yog etched wiring board. Printed circuit boards yog siv nyob rau hauv zoo tag nrho tab sis qhov yooj yim ua lag luam ua khoom siv hluav taws xob.
Lub PCB uas muaj cov khoom siv hluav taws xob yog hu ua lub rooj sib tham hauv Circuit Court (PCA), luam tawm Circuit Board los yog PCB Assembly (PCBA). Hauv kev siv tsis raws cai lo lus "PCB" yog siv ob qho tib si rau liab qab thiab sib sau ua ke, cov ntsiab lus qhia meej lub ntsiab lus.
Cov yam ntxwv ntawm PCB
Txhua kab muaj ib lub tiaj, nqaim ib feem ntawm cov ntawv ci tooj liab uas tseem tshuav tom qab etching. Qhov tsis kam, txiav txim siab los ntawm qhov dav thiab tuab, ntawm cov kab yuav tsum muaj tsawg txaus rau qhov tam sim no tus neeg xyuas pib yuav nqa. Lub zog thiab cov kab hauv av tej zaum yuav xav tau dav dua li cov cim qhia. Nyob rau hauv ib tug multi-txheej board ib tug tag nrho txheej tej zaum yuav feem ntau yog cov khoom tooj liab los ua ib tug dav hlau hauv av rau shielding thiab lub hwj chim rov qab.
Rau microwave circuits, cov kab sib kis tuaj yeem muab tso rau hauv daim ntawv ntawm stripline thiab microstrip nrog kev tswj xyuas qhov ntev kom ntseeg tau tias muaj kev cuam tshuam zoo ib yam. Nyob rau hauv xov tooj cua zaus thiab ceev switching circuits inductance thiab capacitance ntawm cov luam Circuit Court board conductors ua ib tug tseem ceeb Circuit Court ntsiab, feem ntau undesired; tab sis lawv tuaj yeem siv los ua ib feem ntawm kev tsim hluav taws xob hauv Circuit Court, obviating qhov xav tau ntawm cov khoom sib cais ntxiv.
Printed Circuit Court los ua ke
Tom qab cov ntawv luam tawm Circuit Board (PCB) tiav lawm, cov khoom siv hluav taws xob yuav tsum tau muab txuas los ua ib lub rooj sib tham ua haujlwm, lossis PCA (qee zaum hu ua "lub rooj sib tham hauv Circuit Board" PCBA). Hauv kev tsim kho ntawm lub qhov, cov khoom siv lead ua tau muab tso rau hauv qhov. Hauv kev tsim kho saum npoo av, cov khoom siv tau muab tso rau ntawm cov ntaub qhwv los yog cov av ntawm qhov chaw sab nrauv ntawm PCB. Nyob rau hauv ob qho tib si kev tsim kho, cov khoom siv lead ua yog hluav taws xob thiab mechanically tsau rau lub rooj tsavxwm nrog lub molten hlau solder.
Muaj ntau yam txheej txheem soldering siv los txuas cov khoom rau PCB. Kev ntim ntau lawm feem ntau yog ua tiav nrog SMT qhov chaw tso tshuab thiab yoj yoj yoj los yog reflow ncu, tab sis cov kws tshaj lij muaj peev xwm tuaj yeem siv cov khoom me me (piv txwv li 0201 pob khoom uas yog 0.02 in. los ntawm 0.01 in.) los ntawm tes hauv lub tshuab tsom, siv tweezers thiab ib tug zoo ntsis soldering hlau rau me me ntim prototypes. Qee qhov chaw yuav nyuaj heev rau solder los ntawm tes, xws li BGA pob.
Feem ntau, kev tsim kho ntawm lub qhov thiab qhov chaw-mount yuav tsum tau muab tso rau hauv ib qho kev sib dhos vim tias qee qhov yuav tsum tau muaj nyob rau hauv cov pob khoom saum npoo av, thaum lwm tus tsuas yog muaj nyob rau hauv cov pob ntawm qhov. Lwm qhov laj thawj los siv ob txoj hauv kev yog qhov kev sib txuas ntawm lub qhov tuaj yeem muab lub zog xav tau rau cov khoom uas yuav ua rau muaj kev ntxhov siab ntawm lub cev, thaum cov khoom uas xav kom tsis txhob kov yuav siv qhov chaw tsawg dua siv cov txheej txheem saum npoo av.
Tom qab lub rooj tsavxwm tau muaj nyob, nws tuaj yeem raug sim rau ntau txoj hauv kev:
Thaum lub hwj chim tawm, kev tshuaj xyuas qhov muag, automated optical soj ntsuam. JEDEC cov lus qhia rau PCB kev tso kawm, kev sib txuas, thiab kev tshuaj xyuas feem ntau yog siv los tswj kev tswj kom zoo nyob rau theem ntawm kev tsim PCB.
Thaum lub hwj chim tawm, analog kos npe tsom xam, kev ntsuas hluav taws xob tawm.
Thaum lub hwj chim yog nyob rau, nyob rau hauv-circuit test, qhov twg lub cev ntsuas (xws li voltage, zaus) yuav ua tau.
Thaum lub hwj chim qhib, kev sim ua haujlwm, tsuas yog kuaj xyuas yog tias PCB ua li cas nws tau tsim los ua.
Txhawm rau pab txhawb cov kev sim no, PCBs tuaj yeem tsim nrog cov ntaub qhwv ntxiv los ua kev sib txuas ib ntus. Qee zaum cov ntaub qhwv no yuav tsum tau cais tawm nrog cov resistors. Qhov kev ntsuam xyuas hauv-circuit kuj tseem tuaj yeem siv ciam teb kuaj cov yam ntxwv ntawm qee yam khoom. Nyob rau hauv-circuit xeem systems kuj yuav siv tau los program nonvolatile nco Cheebtsam ntawm lub rooj tsavxwm.
Hauv kev sim ntsuas ciam teb, kev sim ntsuas kev sib xyaw ua ke rau hauv ntau yam ICs ntawm lub rooj tsavxwm tsim kev sib txuas ib ntus ntawm PCB kab los kuaj xyuas tias ICs raug teeb tsa kom raug. Kev ntsuam xyuas ciam teb yuav tsum tau ua kom tag nrho cov ICs yuav tsum tau sim siv cov txheej txheem kuaj kev teeb tsa, feem ntau yog qhov Kev Sib Koom Tes Ua Haujlwm Pab Pawg (JTAG) tus qauv. JTAG xeem architecture muab ib txoj hauv kev los ntsuas kev sib cuam tshuam ntawm kev sib koom ua ke ntawm lub rooj tsavxwm yam tsis siv lub cev kuaj kev sojntsuam. JTAG cov neeg muag khoom muab ntau hom kev txhawb nqa thiab cov txheej txheem sophisticated, tsis yog tsuas yog txhawm rau txheeb xyuas cov nets tsis ua haujlwm, tab sis kuj tseem yuav cais cov kev ua txhaum rau cov nets, khoom siv, thiab tus pins.
Thaum cov boards ua tsis tiav qhov kev xeem, cov kws tshaj lij tuaj yeem tshem tawm thiab hloov cov khoom ua tsis tiav, ib txoj haujlwm hu ua rework.
tsim
Luam tawm Circuit Board artwork tiam yog pib ua tiav phau ntawv txheej txheem ua tiav ntawm cov nplooj ntawv mylar ntawm qhov ntsuas ntawm feem ntau 2 lossis 4 npaug ntawm qhov xav tau. Daim duab schematic yog thawj zaug hloov mus rau hauv ib qho kev teeb tsa ntawm cov khoom siv pin pads, tom qab ntawd cov kab tau raug xa mus los muab cov kev sib txuas uas yuav tsum tau ua. Cov ntawv sau ua ntej uas tsis yog tsim tawm mylar daim phiaj pab hauv kev teeb tsa, thiab rub-ntawm kev hloov pauv qhuav ntawm cov txheej txheem ntawm cov khoom siv hluav taws xob (pads, cov ntiv tes tiv tauj, cov ntaub ntawv sib txuas sib txuas, thiab lwm yam) tau pab tsim cov qauv tsim. Cov kab nruab nrab ntawm cov khoom siv tau tsim nrog daim kab xev rau tus kheej. Cov txheej txheem tiav "artwork" yog tom qab ntawd thaij duab rov ua dua ntawm cov txheej txheem tiv thaiv ntawm cov dawb coated tooj liab-clad boards.
Kev xyaum niaj hnub no tsis tshua muaj zog vim cov khoos phis tawj tuaj yeem ua tau ntau yam ntawm cov txheej txheem. Kev loj hlob dav dav rau kev lag luam luam tawm Circuit Board tsim yuav suav nrog:
Schematic capture los ntawm ib tug Electronic tsim automation cuab tam.
Daim npav qhov ntev thiab cov qauv yog txiav txim siab raws li qhov yuav tsum tau muaj circuitry thiab rooj plaub ntawm Kev Txiav Txim cov khoom ruaj khov thiab cov dab dej kub yog tias xav tau.
Txiav txim siab txheej txheej ntawm PCB. 1 mus rau 12 txheej lossis ntau dua nyob ntawm kev tsim qauv. Lub dav hlau hauv av thiab lub dav hlau fais fab txiav txim siab. Cov phiajcim dav hlau uas cov teeb liab raug xa mus yog nyob rau hauv txheej sab saum toj nrog rau cov txheej sab hauv.
Kab impedance txiav txim siv dielectric txheej thickness, routing tooj liab thickness thiab kab-dav. Cov kab sib cais kuj raug coj mus rau hauv tus account hauv cov teeb meem sib txawv. Microstrip, stripline lossis dual stripline tuaj yeem siv los ua cov teeb liab.
Qhov chaw ntawm cov khoom siv. Thermal considerations thiab geometry yog muab rau hauv tus account. Vias thiab av yog cim.
Routing lub teeb liab kab. Rau kev ua tau zoo EMI kev ua haujlwm siab zaus cov teeb liab raug xa mus rau hauv cov khaubncaws sab nraud povtseg ntawm lub zog lossis lub dav hlau hauv av raws li lub dav hlau fais fab coj zoo li hauv av rau AC.
Gerber cov ntaub ntawv tsim rau kev tsim khoom.
Multi-Layer PWB
Kev xaiv rau dedicating txheej rau hauv av
Forms siv dav hlau rau cov teeb liab
EMI Tswj
Yooj yim impedance tswj
Kev xaiv rau dedicating txheej rau Supply Voltages
Tsawg ESL / ESR fais fab kev faib tawm
Ntau cov kev pab cuam rau cov teeb liab
Kev txiav txim siab hluav taws xob hauv kev xaiv cov khoom
Dielectric tsis tu ncua (permittivity)
Qhov ruaj khov dua, qhov zoo dua
Cov nqi qis dua tuaj yeem tsim nyog rau kev suav txheej siab
Cov nqi siab dua tuaj yeem tsim nyog rau qee cov qauv RF
Loss Tangent
Qhov qis dua, qhov zoo dua
Ua ntau qhov teeb meem ntawm ntau zaus
Hws noo haum
Qhov qis dua, qhov zoo dua
Nws tuaj yeem cuam tshuam qhov dielectric tas li thiab poob tangent
Voltage tawg
Qhov siab dua, qhov zoo dua
Feem ntau tsis yog qhov teeb meem, tshwj tsis yog hauv cov ntawv thov hluav taws xob siab
Tivthaiv
Qhov siab dua, qhov zoo dua
Feem ntau tsis yog qhov teeb meem, tshwj tsis yog hauv cov ntawv thov xau tsawg