Thaum tsim PCB, ib qho ntawm cov lus nug tseem ceeb tshaj plaws uas yuav tsum tau xav txog yog kev siv cov kev xav tau ntawm kev ua haujlwm hauv Circuit Court yuav tsum muaj ntau npaum li cas cov txheej txheem, lub dav hlau hauv av thiab lub dav hlau fais fab, thiab cov ntawv luam tawm Circuit Board thaiv txheej, lub dav hlau hauv av thiab lub zog. Kev txiav txim siab dav hlau ntawm tus naj npawb ntawm cov khaubncaws sab nraud povtseg thiab kev ua haujlwm hauv Circuit Court, teeb liab kev ncaj ncees, EMI, EMC, cov nqi tsim khoom thiab lwm yam yuav tsum tau ua.
Rau feem ntau cov qauv tsim, muaj ntau qhov kev tsis sib haum xeeb ntawm PCB kev ua tau zoo, lub hom phiaj tus nqi, kev tsim technology, thiab qhov system complexity.Kev tsim laminated ntawm PCB feem ntau yog qhov kev txiav txim siab tsis txaus siab tom qab txiav txim siab ntau yam.High-speed digital circuits thiab whisker circuits feem ntau yog tsim los nrog ntau txheej txheej.
Nov yog yim lub hauv paus ntsiab lus rau kev tsim cascading:
1. Delamination
Nyob rau hauv ib tug multilayer PCB, feem ntau muaj teeb liab txheej (S), fais fab mov (P) dav hlau thiab grounding (GND) dav hlau.Lub dav hlau fais fab thiab GROUND dav hlau feem ntau yog unsegmented khoom dav hlau uas yuav muab ib tug zoo low-impedance tam sim no rov qab txoj kev rau tam sim no ntawm cov teeb liab kab uas nyob ib sab.
Feem ntau ntawm cov teeb liab txheej nyob nruab nrab ntawm cov khoom siv hluav taws xob los yog hauv av siv dav hlau txheej, tsim cov kab sib luag lossis asymmetric banded kab.Cov khaubncaws sab nraud povtseg sab saum toj thiab hauv qab ntawm ntau txheej PCB feem ntau yog siv los tso cov khoom sib txuas thiab cov xaim me me.Kev xaim ntawm cov teeb liab no yuav tsum tsis txhob ntev dhau los txo cov hluav taws xob ncaj qha los ntawm kev xaim.
2. Txiav txim siab ib lub zog siv dav hlau
Kev siv cov decoupling capacitors yog ib qho tseem ceeb ntsuas los daws qhov kev ncaj ncees ntawm cov khoom siv hluav taws xob.Decoupling capacitors tsuas yog muab tso rau saum thiab hauv qab ntawm PCB.Lub routing ntawm decoupling capacitor, solder ncoo, thiab lub qhov dhau yuav cuam tshuam rau cov nyhuv ntawm decoupling capacitor, uas yuav tsum tau tus tsim yuav tsum xav txog tias cov routing ntawm decoupling capacitor yuav tsum luv thiab dav li sai tau, thiab cov hlau txuas nrog lub qhov yuav tsum tau. kuj yuav luv li sai tau.Piv txwv li, nyob rau hauv lub high-speed digital circuit, nws muaj peev xwm tso lub decoupling capacitor rau saum txheej ntawm PCB, muab txheej 2 mus rau high-ceev digital circuit (xws li processor) raws li lub hwj chim txheej, txheej 3. raws li cov teeb liab txheej, thiab txheej 4 raws li high-speed digital circuit hauv av.
Tsis tas li ntawd, nws yog ib qho tsim nyog los xyuas kom meej tias lub teeb liab routing uas tau tsav los ntawm tib lub high-ceev digital ntaus ntawv yuav siv tib lub hwj chim txheej raws li lub dav hlau siv, thiab lub hwj chim txheej no yog lub hwj huam mov txheej ntawm high-ceev digital ntaus ntawv.
3. Txiav txim siab ntau lub zog siv dav hlau
Lub dav hlau siv hluav taws xob ntau yuav muab faib ua ntau thaj chaw uas muaj qhov sib txawv.Yog hais tias lub teeb liab txheej nyob ib sab ntawm ntau lub hwj chim txheej, lub teeb liab tam sim no nyob ze ntawm lub teeb liab txheej yuav ntsib txoj kev rov qab tsis zoo, uas yuav ua rau muaj qhov khoob hauv txoj kev rov qab los.
Rau high-speed digital signals, qhov tsis tsim nyog rov qab txoj kev tsim no tuaj yeem ua rau muaj teeb meem loj, yog li nws yuav tsum tau ua kom ceev cov teeb liab digital ceev yuav tsum nyob deb ntawm ntau lub zog siv dav hlau.
4.Txiav txim siab ntau lub dav hlau siv hauv av
Ntau lub dav hlau siv hauv av (cov dav hlau hauv av) tuaj yeem muab txoj hauv kev zoo uas tsis muaj impedance tam sim no, uas tuaj yeem txo qis hom EMl.Lub dav hlau hauv av thiab lub dav hlau fais fab yuav tsum nruj ua ke, thiab lub teeb liab txheej yuav tsum nruj nreem txuas rau lub dav hlau siv nyob ib sab.Qhov no tuaj yeem ua tiav los ntawm kev txo cov thickness ntawm nruab nrab ntawm cov khaubncaws sab nraud povtseg.
5. Tsim kev sib txuas ua ke tsim nyog
Ob txheej txheej hla los ntawm txoj kev teeb liab yog hu ua "kev sib txuas ua ke".Qhov kev sib txuas zoo tshaj plaws yog tsim los kom tsis txhob rov qab tam sim no los ntawm ib lub dav hlau siv mus rau lwm qhov, tab sis hloov pauv los ntawm ib qho taw tes (lub ntsej muag) ntawm ib lub dav hlau siv mus rau lwm qhov.Txhawm rau ua kom tiav cov txheej txheem sib txuas, kev hloov pauv interlayer ntawm cov xaim yog qhov kev zam.Thaum lub teeb liab hloov dua siab tshiab ntawm cov khaubncaws sab nraud povtseg, qhov rov qab tam sim no yuav tsum tau ua kom ntseeg tau kom ntws ncaj nraim los ntawm ib lub dav hlau mus rau lwm qhov.Hauv kev tsim qauv, nws tsim nyog xav txog cov khaubncaws sab nraud povtseg raws li kev sib txuas ua ke.
Yog tias txoj kev teeb liab yuav tsum hla ntau txheej, nws feem ntau tsis yog qhov tsim nyog siv los ua kev sib txuas ua ke, vim tias txoj hauv kev los ntawm ntau cov khaubncaws sab nraud povtseg tsis yog patchy rau rov qab tam sim no.Txawm hais tias lub caij nplooj ntoos hlav tuaj yeem raug txo los ntawm kev tso lub decoupling capacitor nyob ze ntawm lub qhov los yog txo qhov tuab ntawm nruab nrab ntawm cov dav hlau siv, nws tsis yog qhov tsim zoo.
6.Kev teeb tsa cov kab hluav taws xob
Thaum txoj hlua hluav taws xob tau teeb tsa rau tib lub teeb liab txheej, nws yuav tsum xyuas kom meej tias cov kev taw qhia ntawm cov hlua feem ntau zoo ib yam, thiab yuav tsum yog orthogonal rau cov kab lus qhia ntawm cov teeb liab uas nyob ib sab.Piv txwv li, txoj kev xaim hluav taws xob ntawm ib txheej teeb liab tuaj yeem teeb tsa rau "Y-axis" kev taw qhia, thiab cov kev taw qhia ntawm lwm cov teeb liab uas nyob ib sab tuaj yeem teem rau "X-axis" kev taw qhia.
7. Adopted tus txheej txheem txheej
Nws tuaj yeem pom los ntawm tus tsim PCB lamination uas classical lamination tsim yog yuav luag tag nrho cov khaubncaws sab nraud povtseg, es tsis yog txheej khib, qhov tshwm sim no tshwm sim los ntawm ntau yam.
Los ntawm kev tsim cov txheej txheem luam tawm ntawm lub rooj tsavxwm, peb tuaj yeem paub tias tag nrho cov txheej txheem hluav taws xob hauv Circuit Board tau txais kev cawmdim ntawm cov txheej txheem tseem ceeb, cov khoom siv ntawm cov tub ntxhais txheej feem ntau yog ob sab cladding board, thaum siv tag nrho cov tub ntxhais txheej. , cov txheej txheem ntawm cov ntawv luam tawm Circuit Board yog txawm tias
Txawm tias txheej luam ntawv Circuit Court boards muaj nqi zoo.Vim tias tsis muaj txheej txheej ntawm cov xov xwm thiab tooj liab cladding, tus nqi ntawm khib-ntaus txheej ntawm PCB raw cov ntaub ntawv yog me ntsis qis dua tus nqi ntawm cov khaubncaws sab nraud povtseg ntawm PCB.Txawm li cas los xij, tus nqi ua haujlwm ntawm ODd-txheej PCB yog qhov tseeb siab dua li ntawm cov txheej txheem PCB vim tias ODd-txheej PCB yuav tsum tau ntxiv cov txheej txheem laminated core txheej txheej txheem sib txuas ntawm cov txheej txheem txheej txheem txheej txheem.Piv nrog rau cov txheej txheem txheej txheej txheej txheem, ntxiv tooj liab cladding sab nraum cov tub ntxhais txheej txheej yuav ua rau txo qis efficiency thiab ntev ntau lawm voj voog.Ua ntej laminating, txheej txheej txheej yuav tsum tau ua ntxiv, uas ua rau muaj kev pheej hmoo ntawm khawb thiab misetching txheej txheej.Kev ua haujlwm sab nraud ntxiv yuav ua rau tus nqi tsim khoom loj.
Thaum cov txheej txheem sab hauv thiab sab nrauv ntawm lub rooj tsavxwm luam tawm tau txias tom qab txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej thiab txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheej txheemThiab raws li lub thickness ntawm lub rooj tsavxwm nce, qhov kev pheej hmoo ntawm khoov ib tug composite printed Circuit Court board nrog ob tug sib txawv qauv nce.Odd-layer circuit boards yog ib qho yooj yim rau khoov, thaum txawm-txheej luam Circuit Court boards tuaj yeem zam kev khoov.
Yog tias lub rooj tsav xwm luam tawm tau tsim nrog cov khib nyiab ntawm cov txheej txheem hluav taws xob thiab cov txheej txheem ntawm cov teeb liab, cov txheej txheem ntxiv cov txheej txheem hluav taws xob tuaj yeem siv tau.Lwm txoj hauv kev yooj yim yog ntxiv cov txheej hauv av hauv nruab nrab ntawm pawg tsis hloov lwm qhov chaw.Ntawd yog, PCB yog xaim nyob rau hauv ib qho khib ntawm cov khaubncaws sab nraud povtseg, thiab tom qab ntawd ib txheej hauv av yog duplicated nyob rau hauv nruab nrab.
8. Kev txiav txim siab nqi
Nyob rau hauv cov nqe lus ntawm kev tsim nqi, multilayer Circuit Court boards yog twv yuav raug hu kim tshaj ib thiab ob txheej Circuit Court boards nrog tib lub PCB cheeb tsam, thiab ntau txheej, tus nqi siab dua.Txawm li cas los xij, thaum txiav txim siab txog kev ua haujlwm ntawm Circuit Court thiab Circuit Court board miniaturization, kom ntseeg tau tias cov teeb liab kev ncaj ncees, EMl, EMC thiab lwm yam kev ntsuas kev ua tau zoo, ntau txheej txheej Circuit Court boards yuav tsum tau siv kom deb li deb tau.Zuag qhia tag nrho, tus nqi sib txawv ntawm ntau txheej Circuit Court boards thiab ib txheej thiab ob-txheej Circuit Court boards tsis ntau tshaj qhov xav tau.