Ib qho yooj yim flex PCB tsim: Kuv yuav ua li cas kom tswj tau qhov impedance?

Ntau tus kws tshaj lij thiab cov neeg tsim qauv feem ntau ntsib cov teeb meem tswj kev tiv thaiv hauv cov qauv nruj-flex PCB. Qhov tseem ceeb no ua kom lub teeb liab kev ncaj ncees thiab kev ua haujlwm zoo ntawm lub voj voog. Hauv tsab ntawv tshaj tawm no, peb yuav tham txog ntau txoj hauv kev thiab kev coj ua los pab koj kom muaj kev tswj xyuas kom zoo hauv cov qauv PCB nruj-flex.

1. Nkag siab lub hauv paus ntawm kev tswj impedance

Impedance yog ib qho kev tiv thaiv Circuit Court rau qhov ntws ntawm alternating tam sim no (AC). Hauv PCB tsim, impedance tswj yog hais txog kev tswj hwm tus nqi impedance tshwj xeeb rau cov teeb liab kab los xyuas kom pom cov teeb liab ua haujlwm zoo. Nws yog ntsuas hauv ohms thiab feem ntau yuav tsum muaj kev tswj xyuas kom tsis txhob muaj teeb meem degradation thiab lwm yam teeb meem kev ua haujlwm.

2. Xav txog PCB stackup

Cov pawg-up ntawm rigid-flex boards muaj feem cuam tshuam rau kev tswj impedance. Ua tib zoo npaj stacking kom ntseeg tau tias tag nrho cov Circuit Court mus txog qhov xav tau qib impedance. Yuav kom ua tiav qhov no, nws yog ib qho tseem ceeb kom ua tib zoo xaiv tus naj npawb thiab hom txheej, cov ntaub ntawv dielectric, thiab lawv cov thickness. Cov cuab yeej xws li teeb liab kev ncaj ncees software tuaj yeem pab txiav txim siab qhov tsis xav tau rau kev tswj hwm impedance.

3. Tsim kev txiav txim siab rau kab dav thiab qhov sib nrug

Cov kab dav dav thiab qhov sib nrug ncaj qha cuam tshuam rau kev tswj hwm impedance. Cov kab nyias nyias feem ntau muaj ntau dua impedance, thaum cov kab dav dav muaj qis impedance. Nws yog ib qho tseem ceeb rau kev xam qhov yuav tsum tau muaj kab dav raws li qhov yuav tsum tau muaj impedance thiab xyuas kom meej qhov chaw txaus ntawm cov kab uas nyob ib sab los tiv thaiv crosstalk thiab lwm yam teeb liab cuam tshuam.

4. Tswj cov khoom siv dielectric

Kev xaiv ntawm cov khoom siv dielectric kuj ua lub luag haujlwm tseem ceeb hauv kev tswj impedance. Cov ntaub ntawv sib txawv muaj cov dielectric sib txawv, uas cuam tshuam rau cov yam ntxwv impedance ntawm kab. Xaiv cov khoom siv dielectric tswj tau tso cai rau kev tswj hwm impedance ntau dua. Nws raug nquahu kom sab laj tus neeg muag khoom thiab siv lawv cov kev qhia tshwj xeeb kom ntseeg tau tias kev xam impedance raug.

5. Kho qhov chaw ntawm cov khoom

Kev tso kawm ntawm cov khoom kom raug tuaj yeem cuam tshuam rau kev tswj hwm impedance. Muab cov khoom siv ceev ceev ua kom luv luv qhov ntev ntawm cov teeb liab kab thiab txo qhov kev pheej hmoo ntawm impedance mismatch. Qhov no tsis yog tsuas yog txhim kho cov teeb liab kev ncaj ncees xwb tab sis kuj txo qhov nyuaj ntawm kev tsim.

6. Impedance tswj routing tshuab

Routing thev naus laus zis kuj tseem ua lub luag haujlwm tseem ceeb hauv kev ua tiav kev tswj hwm impedance. Ntau hom kab, xws li microstrip lossis stripline, muaj cov yam ntxwv tshwj xeeb impedance. Siv cov lus qhia routing uas muab los ntawm cov chaw tsim khoom thiab simulation software kom raug cov teeb liab ceev ceev thaum tswj xyuas qhov xav tau impedance.

7. Txheeb xyuas thiab simulate impedance

Txhawm rau kom ntseeg tau tias kev tswj hwm impedance raug, qhov ntsuas impedance yuav tsum raug txheeb xyuas thiab simulated. Cov cuab yeej teeb pom kev ncaj ncees simulation tuaj yeem pab txheeb xyuas tus cwj pwm ntawm cov teeb liab hauv kev tsim thiab txheeb xyuas cov teeb meem cuam tshuam txog impedance. Los ntawm kev simulating ntau yam xwm txheej, koj tuaj yeem txheeb xyuas koj tus qauv tsim thiab ua qhov tsim nyog hloov kho rau kev pom zoo impedance tswj.

8. Ua haujlwm nrog cov kws tshaj lij PCB

Ua haujlwm nrog tus neeg paub txog PCB kev tsim khoom tuaj yeem muab kev nkag siab zoo rau kev ua tiav kev tswj xyuas kom zoo. Lawv tuaj yeem muab cov lus qhia txog kev tsim khoom, xaiv cov khoom siv, thiab pab nrog kev sim impedance. Lawv cov kws tshaj lij ua kom cov khoom kawg ua tau raws li qhov yuav tsum tau muaj impedance specifications.

Hauv cov ntsiab lus, kev tswj kom zoo impedance yog qhov tseem ceeb rau kev ua kom pom cov teeb liab kev ncaj ncees thiab kev ua tau zoo hauv cov qauv nruj-flex PCB. Los ntawm kev nkag siab txog cov hauv paus ntsiab lus, xav txog stackup, kab dav thiab qhov sib txawv, siv cov khoom siv hluav taws xob tswj tau, ua kom zoo tshaj qhov kev tso kawm, kev siv cov txheej txheem kom raug, thiab simulating tsim, koj tuaj yeem xyuas kom koj ua tiav qhov kev xav tau impedance tswj hauv koj tus qauv nruj-flex PCB. Ua haujlwm nrog tus kws tshaj lij PCB tuaj yeem ua rau muaj txiaj ntsig zoo ntawm koj tus qauv tsim.