Jumper capacitors lossis decoupling capacitors yuav daws tau qee yam teeb meem, tab sis tag nrho impedance ntawm capacitors, vias, pads, thiab thaiv yuav tsum tau txiav txim siab.

Kab lus no yuav qhia txog EMC's PCB tsim thev naus laus zis los ntawm peb yam: PCB txheej txheej txheej txheem, kev txawj teeb tsa thiab cov cai thaiv kab.

PCB txheej txheej txheej txheem

Lub thickness, los ntawm cov txheej txheem thiab cov txheej txheem ntawm cov txheej txheem hauv Circuit Board tsim tsis yog tus yuam sij los daws qhov teeb meem.Zoo txheej txheej txheej yog los xyuas kom meej lub bypass thiab decoupling ntawm lub hwj chim tsheb npav thiab txo qhov voltage nyob rau hauv lub hwj chim txheej los yog av txheej.Tus yuam sij rau kev tiv thaiv electromagnetic teb ntawm lub teeb liab thiab lub hwj chim mov.

Los ntawm qhov kev xav ntawm cov teeb liab kab, ib qho zoo txheej txheej yuav tsum tau muab tag nrho cov teeb liab kab nyob rau hauv ib los yog ob peb txheej, thiab cov khaubncaws sab nraud povtseg ntawm lub hwj chim txheej los yog av txheej.Rau cov khoom siv hluav taws xob, cov txheej txheem txheej txheej zoo yuav tsum yog cov txheej txheem hluav taws xob nyob ib sab ntawm cov txheej hauv av, thiab qhov kev ncua deb ntawm lub hwj chim txheej thiab txheej hauv av yog me me li sai tau.Nov yog qhov peb tab tom tham txog "txhim kho" lub tswv yim.Hauv qab no peb yuav tham tshwj xeeb txog PCB txheej txheej zoo.

1. Lub dav hlau projection ntawm cov txheej thaiv yuav tsum nyob rau hauv thaj tsam ntawm lub dav hlau reflow txheej.Yog tias cov txheej thaiv tsis nyob hauv qhov projection ntawm lub dav hlau reflow txheej, yuav muaj cov kab teeb liab sab nraud ntawm qhov projection thaum lub sij hawm xaim, uas yuav ua rau muaj teeb meem "ntug hluav taws xob", thiab tseem yuav ua rau thaj tsam ntawm cov teeb liab voj voog, uas ua rau muaj teeb meem. nce txawv hom hluav taws xob.

2. Sim zam kom tsis txhob teeb tsa cov kab hluav taws xob uas nyob ib sab.Vim hais tias cov teeb liab sib txuas ntawm cov kab hluav taws xob uas nyob ib sab tuaj yeem ua rau cov teeb liab sib txuas, yog tias cov kab hluav taws xob uas nyob ib sab tsis tuaj yeem zam tau, cov txheej txheem sib nrug ntawm ob txheej thaiv yuav tsum tau nce kom tsim nyog, thiab cov txheej txheem sib nrug ntawm cov xaim txheej thiab nws cov teeb liab Circuit Court yuav tsum raug txo.

3. Cov txheej txheem dav hlau uas nyob ib sab yuav tsum tsis txhob sib tshooj ntawm lawv cov phiaj xwm dav hlau.Vim hais tias thaum lub projections sib tshooj, lub coupling capacitance ntawm cov khaubncaws sab nraud povtseg yuav ua rau lub suab nrov ntawm cov khaubncaws sab nraud povtseg rau ib leeg.

Multilayer board tsim

Thaum lub moos zaus tshaj 5MHz, los yog lub teeb liab nce lub sij hawm tsawg tshaj li 5ns, thiaj li yuav tswj tau lub teeb liab voj cheeb tsam zoo, ib tug ntau-txheej board tsim feem ntau yuav tsum tau.Cov hauv paus ntsiab lus hauv qab no yuav tsum tau them sai sai rau thaum tsim multilayer boards:

1. Cov txheej txheem tseem ceeb (txheej txheej uas lub moos kab, tsheb npav, kab teeb liab interface, xov tooj cua zaus kab, rov pib teeb liab kab, nti xaiv cov kab teeb liab thiab ntau cov kab teeb liab tswj tau nyob) yuav tsum nyob ib sab ntawm lub dav hlau hauv av, zoo dua. nruab nrab ntawm ob lub dav hlau hauv av, Raws li pom hauv daim duab 1.

Cov kab teeb liab tseem ceeb feem ntau yog cov hluav taws xob muaj zog lossis cov kab teeb liab uas tsis tshua muaj siab heev.Kev xaim ze rau lub dav hlau hauv av tuaj yeem txo cov teeb liab voj voog thaj tsam, txo nws txoj kev siv hluav taws xob los yog txhim kho kev tiv thaiv kev cuam tshuam.

2. Lub dav hlau fais fab yuav tsum tau thim rov qab mus rau nws lub dav hlau hauv av uas nyob ib sab (tus nqi pom zoo 5H ~ 20H).Kev thim rov qab ntawm lub dav hlau fais fab txheeb ze rau nws lub dav hlau rov qab hauv av tuaj yeem cuam tshuam qhov teeb meem "ntug hluav taws xob", raws li qhia hauv daim duab 2.

Tsis tas li ntawd, lub dav hlau ua haujlwm tseem ceeb ntawm lub rooj tsavxwm (lub dav hlau dav siv dav siv) yuav tsum nyob ze rau nws lub dav hlau hauv av kom txo tau lub voj voog ntawm lub zog tam sim no, raws li pom hauv daim duab 3.

3. Txawm tias tsis muaj teeb liab kab ≥50MHz ntawm TOP thiab BOTTOM txheej ntawm lub rooj tsavxwm.Yog tias muaj, nws yog qhov zoo tshaj plaws los taug kev cov teeb liab siab zaus ntawm ob txheej txheej dav hlau kom nws cov hluav taws xob mus rau qhov chaw.

Ib txheej board thiab ob txheej txheej board tsim

Rau kev tsim ntawm ib txheej boards thiab ob-txheej boards, tsim ntawm cov teeb liab tseem ceeb thiab cov kab hluav taws xob yuav tsum tau them nyiaj rau.Yuav tsum muaj cov xaim hauv av ntawm ib sab thiab sib npaug rau cov kab hluav taws xob kom txo tau thaj tsam ntawm lub voj voog hluav taws xob tam sim no.

"Ground Ground Line" yuav tsum tau muab tso rau ntawm ob sab ntawm cov teeb liab tseem ceeb ntawm lub rooj tsav xwm ib txheej, raws li pom hauv daim duab 4. Cov kab teeb liab tseem ceeb ntawm lub rooj tsav xwm ob txheej txheej yuav tsum muaj thaj tsam loj hauv av ntawm lub dav hlau projection. , los yog tib txoj kev raws li cov txheej txheem ib txheej, tsim "Ground Ground Line", raws li qhia nyob rau hauv daim duab 5. Lub "guard ground wire" nyob rau ob sab ntawm lub ntsiab teeb liab kab yuav txo tau lub teeb liab voj cheeb tsam ntawm ib sab tes, thiab tseem tiv thaiv crosstalk ntawm kab teeb liab thiab lwm yam teeb liab kab.

PCB layout kev txawj ntse

Thaum tsim cov txheej txheem PCB, koj yuav tsum ua tib zoo saib xyuas lub hauv paus ntsiab lus ntawm kev muab tso rau hauv ib txoj kab ncaj nraim raws lub teeb liab khiav kev taw qhia, thiab sim kom tsis txhob rov qab rov qab, raws li pom hauv daim duab 6. Qhov no tuaj yeem zam kev sib txuas ncaj qha thiab cuam tshuam cov teeb liab zoo. .

Tsis tas li ntawd, txhawm rau tiv thaiv kev sib cuam tshuam thiab kev sib txuas ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, kev tso chaw ntawm circuits thiab kev teeb tsa ntawm cov khoom yuav tsum ua raws li cov hauv qab no:

1. Yog hais tias "hauv av huv si" interface yog tsim los ntawm lub rooj tsavxwm, cov khoom siv lim dej thiab kev sib cais yuav tsum tau muab tso rau ntawm qhov kev sib cais ntawm qhov "chaw huv" thiab hauv av ua haujlwm.Qhov no tuaj yeem tiv thaiv cov khoom siv lim lossis cais tawm los ntawm kev sib txuas rau ib leeg los ntawm txheej txheej txheej, uas ua rau cov nyhuv tsis muaj zog.Tsis tas li ntawd, nyob rau hauv "qhov huv si", sib nrug los ntawm kev lim dej thiab kev tiv thaiv cov cuab yeej, tsis muaj lwm yam khoom siv tuaj yeem muab tso rau.

2. Thaum ntau lub modules muab tso rau hauv tib lub PCB, digital circuits thiab analog circuits, high-speed thiab low-speed circuits yuav tsum tau muab tso rau nyias kom tsis txhob muaj kev cuam tshuam ntawm cov circuits, analog circuits, high-speed circuits, thiab qis. - ceev circuits.Tsis tas li ntawd, thaum lub siab, nruab nrab, thiab qis-ceev circuits muaj nyob rau ntawm lub rooj tsav xwm Circuit Court tib lub sijhawm, txhawm rau kom tsis txhob muaj lub suab nrov ntawm lub voj voog hluav taws xob los ntawm kev cuam tshuam los ntawm kev sib tshuam, cov txheej txheem layout hauv daim duab 7 yuav tsum yog.

3. Lub lim Circuit Court ntawm lub hwj chim input chaw nres nkoj ntawm lub rooj tsav xwm Circuit Court yuav tsum tau muab tso rau ze ntawm lub interface kom tsis txhob rov coupling ntawm lub lim lim.

4. Cov khoom siv lim dej, kev tiv thaiv thiab kev sib cais ntawm lub interface Circuit Court yog muab tso rau ze ntawm lub interface, raws li qhia hauv daim duab 9, uas tuaj yeem ua tiav cov txiaj ntsig ntawm kev tiv thaiv, lim thiab cais tawm.Yog tias muaj ob qho tib si lim thiab tiv thaiv Circuit Court ntawm lub interface, lub hauv paus ntsiab lus ntawm kev tiv thaiv thawj zaug thiab tom qab ntawd lim yuav tsum yog .Vim hais tias cov kev tiv thaiv Circuit Court yog siv rau sab nraud overvoltage thiab overcurrent tsub kom, yog hais tias tus tiv thaiv Circuit Court yog muab tso rau tom qab lub lim Circuit Court, lim Circuit Court yuav puas los ntawm overvoltage thiab overcurrent.

Tsis tas li ntawd, txij li cov kev tawm tswv yim thiab cov kab hluav taws xob hauv Circuit Court yuav ua rau tsis muaj zog ntawm kev lim dej, kev sib cais lossis kev tiv thaiv thaum lawv ua ke nrog ib leeg, xyuas kom meej tias cov khoom siv thiab cov kab tawm ntawm lub lim lim (filter), kev sib cais thiab kev tiv thaiv Circuit Court tsis ua. ob leeg nrog ib leeg thaum layout.

5. Cov khoom siv hluav taws xob tsis zoo lossis cov khoom siv (xws li rov pib dua circuits, thiab lwm yam) yuav tsum nyob deb tsawg kawg yog 1000 mils ntawm txhua ntug ntawm lub rooj tsavxwm, tshwj xeeb tshaj yog cov ntug ntawm lub rooj sib tham.


6. Lub zog cia thiab lub tshuab lim dej ntau zaus yuav tsum tau muab tso rau ze ntawm chav tsev circuits lossis cov khoom siv nrog cov kev hloov pauv loj tam sim no (xws li cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob ntawm cov khoom siv hluav taws xob, cov kiv cua thiab cov relays) kom txo cov voj voog ntawm qhov loj tam sim no. lub voj.

7. Cov khoom siv lim dej yuav tsum tau muab tso rau ntawm ib sab kom tsis txhob muaj kev cuam tshuam ntawm cov lim dej ntxiv.

8. Khaws cov khoom siv hluav taws xob muaj zog xws li cov khoom siv lead ua, siv lead ua oscillators, relays, hloov cov khoom siv hluav taws xob, thiab lwm yam. kom deb ntawm lub rooj tsavxwm interface connector tsawg kawg yog 1000 mils.Nyob rau hauv txoj kev no, kev cuam tshuam tuaj yeem ncaj qha mus rau sab nraud lossis tam sim no tuaj yeem txuas nrog rau cov kab hluav taws xob tawm mus rau sab nraud.

REALTER: Printed Circuit Board, PCB Tsim, PCB Assembly