Hauv kev lag luam hluav taws xob niaj hnub no, muaj kev xav tau ntau ntxiv rau kev tsim kho tshiab, muaj txiaj ntsig zoo luam tawm Circuit Boards (PCBs).Raws li kev lag luam loj hlob, yog li qhov xav tau ntawm PCBs uas tuaj yeem tiv taus ntau yam ib puag ncig thiab ua tau raws li qhov xav tau ntawm cov khoom siv hluav taws xob nyuaj.Qhov no yog qhov uas lub tswv yim ntawm flex rigid-flex PCB los ua si.
Rigid-flex boards muaj kev sib xyaw ua ke ntawm cov ntaub ntawv nruj thiab hloov tau yooj yim, ua rau lawv zoo tagnrho rau cov ntawv thov uas yuav tsum tau ua kom ntev thiab yoog raws.Cov boards no feem ntau pom muaj nyob rau hauv cov khoom siv kho mob, aerospace systems, thiab lwm yam kev ntseeg siab.
Impedance tswj yog ib qho tseem ceeb uas cuam tshuam rau kev ua tau zoo ntawm cov rigid-flex boards.Impedance yog qhov kev tiv thaiv ib qho hluav taws xob muab rau qhov ntws ntawm alternating tam sim no (AC).Kev tswj kom zoo impedance yog qhov tseem ceeb vim nws ua kom ntseeg tau cov teeb liab kis tau tus mob thiab txo qis zog poob.
Hauv qhov blog no, Capel yuav tshawb txog tsib yam uas tuaj yeem cuam tshuam loj rau kev tswj hwm ntawm cov rigid-flex boards.Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb rau PCB cov neeg tsim khoom thiab cov chaw tsim khoom kom xa cov khoom lag luam zoo uas ua tau raws li qhov xav tau ntawm lub ntiaj teb kev siv tshuab niaj hnub no.
1. Cov substrates sib txawv yuav cuam tshuam rau tus nqi impedance:
Rau Flex Rigid-Flex PCB, qhov sib txawv ntawm cov khoom siv hauv paus muaj kev cuam tshuam rau tus nqi impedance.Nyob rau hauv rigid-flex boards, hloov tau yooj yim substrate thiab rigid substrate feem ntau muaj txawv dielectric tsis tu ncua thiab conductivity, uas yuav ua rau impedance mismatch teeb meem ntawm lub interface ntawm ob lub substrates.
Tshwj xeeb tshaj yog, hloov tau yooj yim substrates muaj ib tug ntau dua dielectric tas li thiab qis hluav taws xob conductivity, thaum lub zog substrates muaj ib tug qis dielectric tsis tu ncua thiab ntau dua hluav taws xob conductivity.Thaum lub teeb liab propagates nyob rau hauv lub nruj-flex Circuit Court board, yuav muaj kev xav thiab kis tau tus mob ntawm lub interface ntawm rigid-flexible pcb substrate.Cov kev xav thiab kev sib kis no ua rau lub impedance ntawm lub teeb liab hloov, uas yog, impedance mismatch.
Yuav kom tswj tau zoo dua qhov impedance ntawm flex-rigid pcb, cov hauv qab no tuaj yeem siv tau:
Kev xaiv substrate:xaiv ib tug ua ke ntawm nruj flex Circuit Court substrates kom lawv cov dielectric tas li thiab conductivity nyob ze li sai tau kom txo tau qhov teeb meem ntawm impedance mismatch;
Interface kev kho mob:kev kho tshwj xeeb rau kev sib txuas ntawm pcb nruj flex substrates, xws li siv txheej txheej tshwj xeeb interface lossis laminated zaj duab xis, txhawm rau txhim kho impedance txuam rau qee yam;
Nias tswj:Nyob rau hauv kev tsim cov txheej txheem ntawm rigid saj zawg zog pcb, tsis xws li kub, siab thiab lub sij hawm yog nruj me ntsis tswj los xyuas kom meej zoo bonding ntawm nruj flex Circuit Court board substrates thiab txo impedance hloov;
Simulation thiab debugging:Los ntawm kev simulation thiab kev tsom xam ntawm cov teeb liab nthuav tawm nyob rau hauv lub rigid saj zawg zog pcb, nrhiav kom paub qhov teeb meem ntawm impedance mismatch, thiab ua raws li kev hloov kho thiab optimizations.
2. Kab dav qhov sib nrug yog qhov tseem ceeb cuam tshuam rau kev tswj impedance:
Nyob rau hauv lub rigid-flex board, kab dav qhov sib nrug yog ib qho tseem ceeb cuam tshuam rau kev tswj impedance.Cov kab dav (piv txwv li qhov dav ntawm cov xaim) thiab cov kab sib nrug (piv txwv li qhov kev ncua deb ntawm cov xov hlau uas nyob ib sab) txiav txim siab txog geometry ntawm txoj kev tam sim no, uas nyob rau hauv lem cuam tshuam cov yam ntxwv kis tau tus mob thiab impedance tus nqi ntawm lub teeb liab.
Cov hauv qab no yog qhov cuam tshuam ntawm txoj kab dav dav ntawm qhov kev tswj hwm impedance ntawm lub rooj tsavxwm nruj-flex:
Fundamental Impedance:Kab sib nrug yog qhov tseem ceeb rau kev tswj cov impedance tseem ceeb (piv txwv li, cov yam ntxwv impedance ntawm microstrip kab, coaxial cables, thiab lwm yam).Raws li kev sib kis kab txoj kev xav, yam xws li kab dav, kab sib nrug, thiab substrate thickness sib koom ua ke txiav txim siab tus yam ntxwv impedance ntawm kab kis.Thaum txoj kab dav dav hloov pauv, nws yuav ua rau muaj kev hloov pauv ntawm cov yam ntxwv impedance, yog li cuam tshuam rau kev sib kis ntawm cov teeb liab.
Qhov sib txawv ntawm impedance:Impedance txuam feem ntau yuav tsum tau nyob rau hauv nruj-flex boards los xyuas kom meej qhov zoo tshaj plaws kis tau tus mob ntawm cov teeb liab thoob plaws hauv Circuit Court.Impedance txuam feem ntau yuav tsum tau kho cov kab dav dav kom ua tiav.Piv txwv li, nyob rau hauv ib tug microstrip kab, tus yam ntxwv impedance ntawm cov kis tau tus mob yuav muab sib piv rau lub impedance yuav tsum tau los ntawm lub system los ntawm kev kho qhov dav ntawm conductors thiab qhov sib nrug ntawm cov conductors nyob ib sab.
Crosstalk thiab Poob:Kab sib nrug kuj muaj qhov cuam tshuam tseem ceeb ntawm kev tswj kev sib tham thiab kev poob.Thaum txoj kab dav dav me me, qhov hluav taws xob sib txuas ua ke ntawm cov xov hlau uas nyob ib sab yog txhim kho, uas yuav ua rau muaj kev sib tham ntau ntxiv.Tsis tas li ntawd, qhov dav me me ntawm cov xaim me me thiab cov xaim loj dua ua rau muaj kev faib tawm ntau dua tam sim no, ua rau cov hlau tsis kam thiab poob.
3. Lub thickness ntawm cov khoom kuj yog ib qho tseem ceeb cuam tshuam rau impedance tswj ntawm rigid-flex board:
Variations nyob rau hauv cov ntaub ntawv thickness ncaj qha cuam tshuam tus yam ntxwv impedance ntawm kis kab mob.
Cov nram qab no yog cov nyhuv ntawm cov khoom thickness ntawm impedance tswj ntawm rigid-flex boards:
Transmission kab yam ntxwv impedance:Tus yam ntxwv impedance ntawm ib kab kis tau tus mob yog hais txog qhov sib npaug ntawm qhov tam sim no thiab qhov hluav taws xob ntawm cov kab sib txuas ntawm ib qho zaus.Nyob rau hauv lub rigid-flex board, lub thickness ntawm cov khoom yuav cuam tshuam tus nqi ntawm tus yam ntxwv impedance ntawm cov kis kab mob.Feem ntau hais lus, thaum cov khoom thickness ua thinner, tus yam ntxwv impedance yuav nce;thiab thaum cov khoom thickness ua thicker, tus yam ntxwv impedance yuav txo.Yog li ntawd, thaum tsim ib tug nruj-flex board, nws yog tsim nyog los xaiv ib tug tsim nyog cov ntaub ntawv thickness kom ua tau raws li qhov yuav tsum tau cov yam ntxwv impedance raws li system yuav tsum tau thiab cov teeb liab kis tau tus mob yam ntxwv.
Kab-rau-Space Ratio:Variations nyob rau hauv cov ntaub ntawv thickness kuj yuav cuam tshuam cov kab-rau-spacing ratio.Raws li txoj kev sib kis kab txoj kev xav, tus yam ntxwv impedance yog proportional rau qhov piv ntawm kab dav mus rau qhov chaw.Thaum cov khoom thickness hloov, thiaj li yuav tswj tau qhov stability ntawm tus yam ntxwv impedance, nws yog tsim nyog los kho qhov ratio ntawm kab dav thiab kab sib nrug raws li.Piv txwv li, thaum lub thickness ntawm cov khoom raug txo, thiaj li yuav ua kom tus yam ntxwv impedance tas li, txoj kab dav yuav tsum tau txo kom raws li, thiab cov kab sib nrug yuav tsum tau correspondingly txo kom cov kab dav rau qhov chaw piv tsis hloov.
4. Kev kam rau siab ntawm electroplated tooj liab kuj yog ib qho tseem ceeb cuam tshuam rau kev tswj impedance ntawm lub rooj tsavxwm hloov tau yooj yim:
Electroplated tooj liab yog cov txheej txheem siv feem ntau hauv cov rigid-flex boards, thiab cov kev hloov hauv nws cov thickness thiab kam rau ua yuav cuam tshuam ncaj qha rau cov yam ntxwv impedance ntawm lub rooj tsavxwm.
Cov hauv qab no yog qhov cuam tshuam ntawm electroplating tooj liab kam rau ua rau lub impedance tswj ntawm saj zawg zog boards:
Electroplated tooj liab thickness kam rau ua:Lub thickness ntawm electroplated tooj liab yog ib qho ntawm cov yam tseem ceeb cuam tshuam rau lub impedance ntawm lub rigid-flex board.Yog hais tias lub thickness kam rau ua ntawm electroplated tooj liab loj heev, lub thickness ntawm conductive txheej ntawm lub phaj yuav hloov, yog li cuam tshuam rau tus yam ntxwv impedance ntawm lub phaj.Yog li ntawd, thaum tsim flex rigid boards, nws yuav tsum nruj me ntsis tswj lub thickness kam rau ua ntawm electroplated tooj liab los xyuas kom meej stability ntawm tus yam ntxwv impedance.
Uniformity ntawm electroplating tooj liab:Ntxiv nrog rau kev ua siab ntev ntev, qhov sib xws ntawm electroplating tooj liab kuj tseem cuam tshuam rau kev tswj impedance ntawm rigid-flex boards.Yog hais tias muaj ib qho tsis sib npaug ntawm cov electroplated tooj liab txheej ntawm lub rooj tsavxwm, ua rau cov thicknesses sib txawv ntawm cov electroplated tooj liab nyob rau ntau qhov chaw ntawm lub rooj tsavxwm, tus yam ntxwv impedance kuj yuav hloov.Yog li ntawd, nws yog tsim nyog los xyuas kom meej lub uniformity ntawm electroplated tooj liab los xyuas kom meej qhov sib xws ntawm cov yam ntxwv impedance thaum tsim cov mos mos thiab nruj boards.
5. Etching kam rau ua kuj yog ib qho tseem ceeb cuam tshuam rau impedance tswj ntawm rigid-flex boards:
Etching kam rau ua yog hais txog qhov sib txawv ntawm lub thickness ntawm lub phaj uas tuaj yeem tswj tau thaum etching yog nqa tawm nyob rau hauv tus txheej txheem ntawm kev tsim cov rigid boards.
Cov hauv qab no yog cov teebmeem ntawm etching tolerances ntawm lub impedance tswj ntawm rigid-flex boards:
Impedance txuam ntawm rigid-flex board: Nyob rau hauv cov txheej txheem ntawm rigid-flex board, etching feem ntau yog siv los tswj tus yam ntxwv impedance tus nqi.Los ntawm etching, qhov dav ntawm cov txheej txheem conductive tuaj yeem hloov kho kom ua tiav tus nqi impedance xav tau los ntawm tus tsim.Txawm li cas los xij, thaum lub sij hawm etching txheej txheem, txij li thaum lub etching ceev ntawm etching tov ntawm lub phaj tej zaum yuav muaj ib tug tej yam kam rau ua, tej zaum yuav muaj deviations nyob rau hauv lub dav ntawm cov conductive txheej tom qab etching, uas cuam tshuam rau qhov meej tswj ntawm tus yam ntxwv impedance.
Kev sib raug zoo ntawm tus yam ntxwv impedance:Etching tolerances kuj tuaj yeem ua rau qhov sib txawv ntawm cov thickness ntawm cov txheej txheem conductive nyob rau hauv cov cheeb tsam sib txawv, uas ua rau cov yam ntxwv tsis sib xws impedance.Qhov tsis sib xws ntawm cov yam ntxwv impedance tuaj yeem cuam tshuam qhov kev sib kis ntawm lub teeb liab, uas yog qhov tseem ceeb tshwj xeeb hauv kev sib txuas lus siab lossis kev siv ntau zaus.
Kev tswj hwm impedance yog ib qho tseem ceeb ntawm Flex Rigid-Flex PCB tsim thiab tsim.Kev ua tiav qhov tseeb thiab zoo ib yam impedance qhov tseem ceeb yog qhov tseem ceeb rau kev txhim kho cov teeb liab kis tau tus mob thiab kev ua tau zoo tag nrho ntawm cov khoom siv hluav taws xob.Yog li los ntawm kev ua tib zoo saib xyuas cov kev xaiv substrate, kab geometry, tswj dielectric thickness, tooj liab plating tolerances, thiab etch tolerances, PCB designers thiab manufacturers tuaj yeem ua tiav cov khoom zoo, zoo rigid-flex boards uas ua tau raws li kev lag luam cov kev cai nruj. 15 xyoo ntawm kev sib qhia kev lag luam, Kuv vam tias Capel tuaj yeem coj koj pab tau.Yog xav paub ntxiv txog cov lus nug hauv Circuit Board, thov sab laj nrog peb ncaj qha, Capel cov kws tshaj lij pawg kws tshaj lij Circuit Board yuav teb koj hauv online.
Post lub sij hawm: Aug-22-2023
Rov qab
