Lub High-Speed PCB yog dab tsi?
Peb hu rau PCB nrog lub teeb liab kis tau tus mob siab tshaj 1GHz lub high-speed luam Circuit Court board.
Dab tsi yog qhov zoo ntawm kev siv high-speed PCBs?
Txhawm rau txhim kho lub teeb liab zaus thiab daws qhov teeb meem EMI ntawm cov khoom siv hluav taws xob, kev kub ceev PCBs tau tsim. Tom qab kev tsim ntawm high-ceev PCB tau txais txiaj ntsig zoo, nws txoj kev koom tes rau EMI tseem ceeb zuj zus. Yuav luag 60% ntawm EMI teeb meem tuaj yeem daws tau los ntawm kev kub ceev PCBs.
Dab tsi yog cov khoom siv hauv high-speed PCBs?
Cov ntaub ntawv uas muaj cua sov tsis kam, mechanical toughness, thiab zoo (kev ntseeg siab)
Cov ntaub ntawv nrog ruaj khov Dk / Df tsis muaj (cov coefficient me me ntawm kev hloov pauv nrog zaus thiab ib puag ncig)
Cov khoom siv nrog zoo impedance tswj
Cov ntaub ntawv uas tsis tshua muaj roughness ntawm tooj liab ntawv ci nto
Xaiv cov iav fiber ntau nrog cov qhov qhib me me yog pom zoo.
Cov lus qhia dab tsi kuv yuav tsum xav txog thaum tsim lub siab ceev PCB?
Ob peb lub tswv yim ntawm kev tsim lub siab ceev PCB tau piav qhia hauv qab no.
1) Siv cov software tsim nrog cov kev xaiv siab heev
Cov engineers yuav tsum paub cov software tsim uas tuaj yeem muab cov kev xaiv siab heev. Cov cuab yeej software xav tau ntau yam kev txawj ntse kom tsim tau cov PCBs ceev hauv CAD software. Koj yuav tsum muaj kev nkag siab zoo ntawm CAD cov cuab yeej muaj zog.
2) High-speed routing
Thaum nws los txog rau high-ceev routing, designers yuav tsum to taub cov cai ntawm cov yooj yim routing, nrog rau tsis txhob txiav tawm hauv av txheej thiab ua kom lub routing luv luv. Yog li ntawd, thov tiv thaiv crosstalk hla ib qho kev ncua deb ntawm cov kab digital thiab tiv thaiv txhua yam uas yuav ua rau muaj kev cuam tshuam rau lub teeb liab kev ncaj ncees.
3) Routing nrog impedance tswj
Rau qee cov cim ntawm 40-120 ohms, lawv xav tau impedance txuam. Cov yam ntxwv impedance txuam yog qhia los ntawm cov kav hlau txais xov thiab ntau qhov sib txawv ua khub.
Designers yuav tsum to taub yuav ua li cas xam qhov dav ntawm lub routing thiab qhov tsim nyog pawg-up ntawm tus nqi impedance. Yog tias tus nqi impedance tsis raug, nws yuav muaj kev cuam tshuam loj rau lub teeb liab, uas tuaj yeem ua rau cov ntaub ntawv tsis ncaj ncees.
4) Cov kab nrog ntev sib txuam
Muaj ntau txoj kab hauv lub tsheb npav ceev ceev thiab tsheb npav interface. Cov kab no tuaj yeem ua haujlwm ntawm ntau zaus, yog li lub teeb liab yuav tsum tau xa mus ib txhij los ntawm tus xa mus rau lub receiver. Tsis tas li ntawd, nws yuav tsum muaj qhov tshwj xeeb hu ua qhov sib txuam ntev. Yog li ntawd, cov qauv feem ntau txhais cov kev kam rau ua qhov tseem ceeb uas yuav tsum tau ua kom haum rau qhov ntev.
5) Txo qhov cheeb tsam ntawm lub voj voog rov qab tam sim no
High-speed PCB designers yuav tsum tau ua raws li cov kev cai yooj yim, xws li tsim ib tug nruam av txheej thiab txo qhov chaw ntawm lub tam sim no rov qab Circuit Court los ntawm optimizing tam sim no rov qab txoj kev ntawm routing, raws li zoo raws li muab ntau stitched vias.
Dab tsi yog qee qhov kev coj ua zoo tshaj plaws rau kev tsim cov PCBs ceev?
High-speed PCB tsim kev txawj ntse yog mastered, uas ua kom cov teeb liab kev ncaj ncees.
Cov ntaub ntawv ntawm high-speed PCBs raug xaiv kom zoo los xyuas kom meej qhov ua tau zoo ntawm cov teeb liab kis tau tus mob.
Kev tswj ntau lawm yog ua. Cov ntsiab lus tseem ceeb thaum lub sij hawm tsim khoom yog qhov dav ntawm circuits, txheej txheej, vias plated nrog tooj liab, tooj liab thickness ntawm circuits, thickness ntawm solder daim npog qhov ncauj, thiab lwm yam.
Tus nqi ntawm cov tswv yog dab tsi thaum nws los txog rau high-ceev PCBs?
Cov hauv qab no yuav cuam tshuam tus nqi ntawm kev kub ceev PCBs.
Khoom siv (cov khoom siv substrate, thickness ntawm substrate, tooj liab thickness)
Cov khoom siv tsim khoom siv
Qhov nyuaj ntawm kev tsim khoom
Cov neeg siv khoom xav tau
Txoj kev ntim khoom xaiv
Txoj kev xa khoom xaiv
Yuav Ua Li Cas Tsim High-Speed PCB?
High-speed PCB tsim yog cov txheej txheem nyuaj uas yuav tsum tau saib xyuas tag nrho ntawm cov teeb liab, impedance, cov kab sib txuas, thiab ntau lwm yam kev qhia. Cov ntsiab lus hauv qab no tuaj yeem muab qee qhov kev siv.
Siv ntau txheej rau routing tsim nyog.
Qhov luv luv ntawm cov hlau lead ntawm cov pins ntawm high-speed circuit devices, qhov zoo dua.
Siv cov av ib puag ncig rau cov kab teeb liab tshwj xeeb lossis cov koog hauv zos.
High-frequency teeb liab kab tso rau saum npoo txheej yog nquag tsim hluav taws xob loj dua. Cov kab hluav taws xob ntau zaus yuav tsum muab tso rau nruab nrab ntawm lub hwj chim txheej thiab txheej hauv av. Cov hluav taws xob tsim tawm yuav tsawg dua vim qhov nqus ntawm cov hluav taws xob hluav taws xob los ntawm lub hwj chim txheej thiab cov txheej hauv qab.
Dab tsi yog qhov txawv ntawm lub siab ceev PCB thiab tus qauv PCB?
Rau tus qauv PCB, tib neeg feem ntau txhawj xeeb txog qhov luv luv Circuit Court, rwb thaiv tsev, thiab lwm yam teeb meem ntawm cov hlau hlau. Txawm li cas los xij, nrog rau kev nrhiav kev ua haujlwm siab ntawm cov khoom siv hluav taws xob, cov teeb liab kis tau tus mob yuav tsum tau nce ntxiv thiab cov neeg muaj kev txhawj xeeb ntau ntxiv txog cov teeb liab kev ncaj ncees tsim ntawm high-speed PCB.
Puas muaj kev txiav txim siab tshwj xeeb thaum tuav cov PCBs ceev?
Cov kev txiav txim siab tshwj xeeb yog nyob rau hauv high-speed PCB tsim thiab ntau lawm thaum tuav cov PCBs ceev.
Qhov ntev ntawm qhov sib txawv routing yuav tsum sib phim.
Txoj kev yuav tsum tsis txhob hla cov dav hlau hauv av tsis tiav.
Tsis txhob muab cov ntsiab lus xeem rau ntawm cov kab teeb liab sib txawv.
Tsis txhob hla cov kab teeb liab ceev ceev ze lossis qis dua cov muaju, oscillators, hloov cov khoom siv hluav taws xob, cov qhov txuas, cov khoom sib nqus, lossis cov teeb liab chips.
Sim ua cov kab teeb liab ceev ceev rau saum thiab hauv qab cov khaubncaws sab nraud povtseg nrog rau tag nrho cov ntaub ntawv hauv av txheej. Nws tsis pom zoo kom taug txoj kab ntawm lub dav hlau sab hauv.
Khaws qhov kev ncua deb ntawm lub teeb liab ceev mus rau ntug ntawm cov ntaub ntawv hauv av txheej ntau tshaj 90mil.
Ua tib zoo saib xyuas kev tuav ntawm lub qhov (socket) thiab txuas txuas txuas.
Coppe kab dav dav, qhov chaw, thiab cov qauv layup yuav tsum raug tswj kom tau raws li tus nqi nruj impedance.
TDR impedance xeem feem ntau xav tau thaum high-ceev PCBs tiav.
Cov khoom siv zoo yuav tsum raug xaiv kom ua tau raws li qhov xav tau.
Qhov chaw tiaj tiaj yog xav tau rau kev kub ceev PCBs, thiab peb ib txwm qhia ENIG rau ENEPIG nto kho.
Dab tsi yog qhov siab tshaj plaws cov ntaub ntawv hloov pauv tau ua tiav ntawm PCB kev kub ceev?
Qhov theoretical siab tshaj plaws cov ntaub ntawv hloov pauv tau ua tiav ntawm PCB kev kub ceev yog 10.0GPs (Gigabits ib ob) nyob deb, tab sis qhov no yog kev txhim kho txuas ntxiv.
Puas muaj cov cuab yeej tshwj xeeb lossis cov txheej txheem uas yuav tsum tau ua thaum tsim lub siab ceev PCB?
Yuav tsum muaj PCB tsim software cov cuab yeej thiab EDA simulation cov cuab yeej siv thaum tsim lub PCB siab ceev xws li Cadence, Mentor, PADS, Altium, HyperLynx, HFSS, ADS, thiab lwm yam.
Nws yog ib qho tsim nyog sau cia tias ib lub cuab yeej software yuav tsim nyog rau ib qhov project PCB, thaum lwm cov cuab yeej software tuaj yeem siv tau zoo rau lwm hom phiaj xwm. Yog li ntawd, nws yog ib qho tseem ceeb heev kom nrhiav tau txoj cai PCB tsim software cuab yeej.
Dab tsi yog qhov kev qhia tshwj xeeb thiab cov chaw muag khoom ntawm cov khoom siv PCB ceev?
Cov khoom siv ceev ceev tuaj yeem yog FR4, ceramic, PTFE lossis PTFE cov khoom siv ntxiv nrog 1 Ghz txog 100 Ghz. Muaj ntau lub npe nrov kev kub ceev PCB cov khoom lag luam xws li: Rogers, ISOLA, Ventec, ITEQ, TUC, SHENGYI, Panasonic, Taconic, thiab lwm yam.