01
Lub Hwj Huam Legout ntsig txog
Cov kab hluav taws xob digital feem ntau yuav tsum tau ua tsis tau yooj yim, yog li inrush cov dej ntws yog tsim rau qee cov khoom siv nrawm.
Yog tias lub zog hluav taws xob yog ntev heev, muaj cov suab nrov tam sim no yuav ua rau muaj suab nrov zoo, thiab cov suab nrov zoo tshaj plaws yuav raug qhia rau lwm cov cim. Nyob rau hauv kev kub ceev lub voj voog, yuav muaj kev lag luam parasitic tsis tseem ceeb yuav ua rau muaj lwm yam kev tawm tsam mus rau ib qho hluav taws xob hluav taws xob, yog li qhov chaw siab uas ua rau muaj hluav taws xob hluav taws xob ib nrab, uas tuaj yeem ua rau lub Circuit Court.
Yog li ntawd, nws yog ib qho tseem ceeb rau kev ntxiv cov candpass Capritor pem hauv ntej ntawm cov ntaus ntawv digital. Qhov loj dua qhov hluav taws xob, lub zog sib kis tau txwv, yog li muaj peev xwm loj thiab muaj peev xwm muaj peev xwm sib xyaw ua ke ntau zaus.
Tsis txhob kub me me: teeb liab Vias yuav tsim cov vias ntawm txheej fais fab thiab txheej hauv qab. Yog li ntawd, qhov chaw tsis tsim nyog ntawm Vias yog qhov yuav nce qhov ceev tam sim no hauv qee thaj chaw ntawm lub zog lossis dav hlau. Cov chaw no qhov chaw ntom ntom tam sim no nce yog hu ua cov pob kub.
Yog li ntawd, peb yuav tsum sim peb qhov xwm txheej kom zam dhau qhov xwm txheej no thaum teeb meem los tiv thaiv lub dav hlau los ntawm kev sib cais, uas yuav ua rau muaj teeb meem EMC.
Feem ntau txoj kev zoo tshaj plaws kom tsis txhob muaj kev sib txawv, yog li cov phiaj xwm tam sim no, yog li cov phiaj xwm kev rov qab yuav tsis tshwm sim ntev, thiab EMC teeb meem yuav tsis tshwm sim.
02
Txoj kev khoov ntawm cov kab
Thaum tso cov teeb liab high-speed teeb liab kab, zam kev khoov cov teeb liab ntau li ntau tau. Yog tias koj yuav tsum khoov cov kab tawm, tsis txhob lw nws ntawm kev mob lossis sab xis kaum, tab sis theej siv obtuse kaum.
Thaum tso cov teeb liab siab, peb feem ntau siv cov kab Serpentine kom ua tiav qhov ntev. Tib lub serpentine kab yog qhov ua tau ib hom khoov. Txoj kab dav, placing, thiab khoov hom kev tsim nyog yuav tsum tau xaiv tsim nyog, thiab cov kev sib tw yuav tsum tau raws li 4W / 1.5W txoj cai.
03
Daim phiajcim sib thooj
Yog tias qhov kev ncua deb ntawm cov teeb meem nrawm yog ze heev, nws yooj yim los tsim cov tsheb ciav hlau. Qee zaum, vim cov txheej txheem, pawg thawj coj loj thiab lwm yam, qhov kev ncua deb ntawm peb qhov kev ncua deb ntau tshaj li ntau tau ntau li ntau tau ze rau ntawm lub luv. deb.
Qhov tseeb, yog tias qhov chaw txaus, sim ua kom muaj kev ncua deb ntawm ob lub siab-nrawm teeb liab kab.
03
Daim phiajcim sib thooj
Yog tias qhov kev ncua deb ntawm cov teeb meem nrawm yog ze heev, nws yooj yim los tsim cov tsheb ciav hlau. Qee zaum, vim cov txheej txheem, pawg thawj coj loj thiab lwm yam, qhov kev ncua deb ntawm peb qhov kev ncua deb ntau tshaj li ntau tau ntau li ntau tau ze rau ntawm lub luv. deb.
Qhov tseeb, yog tias qhov chaw txaus, sim ua kom muaj kev ncua deb ntawm ob lub siab-nrawm teeb liab kab.
05
Impedance tsis tas mus li
Lub impedance tus nqi ntawm ib lub moos feem ntau nyob ntawm nws kab dav dav thiab qhov kev ncua deb ntawm cov kab thiab lub dav hlau siv. Tus dav dav txoj lw, qhov qis nws impedance. Hauv qee qhov interface terminals thiab cuab yeej siv tshuab, lub hauv paus ntsiab lus tseem siv tau.
Thaum cov ntaub qhwv ntawm lub davhlau ya nyob twg txuas nrog txoj kab teeb liab high-illedance Hauv qhov no, impedance discontinuity yuav tshwm sim, thiab cov paib yuav tshwm sim yog tias impedance yog qhov tsis sib xws.
Yog li ntawd, txhawm rau daws cov teeb meem tooj liab tau muab tso rau hauv cov ntaub qhwv loj hauv lub thawv lossis lub dav hlau siv rau lwm txheej kom cov impedance ua kom lub impedance nruam.
Vias yog lwm qhov ntawm impedance discontinuity. Txhawm rau kom txo cov nyhuv no, daim tawv nqaij tsis tsim nyog sib txuas nrog cov txheej sab hauv thiab ntawm yuav tsum tau muab tshem tawm.
Qhov tseeb, kev ua haujlwm zoo no tuaj yeem tshem tawm los ntawm CAD cov cuab yeej thaum lub chaw tsim khoom loj tsis tsim nyog thiab paub meej txog kev ncua ntxiv.
Vias yog lwm qhov ntawm impedance discontinuity. Txhawm rau kom txo cov nyhuv no, daim tawv nqaij tsis tsim nyog sib txuas nrog cov txheej sab hauv thiab ntawm yuav tsum tau muab tshem tawm.
Qhov tseeb, kev ua haujlwm zoo no tuaj yeem tshem tawm los ntawm CAD cov cuab yeej thaum lub chaw tsim khoom loj tsis tsim nyog thiab paub meej txog kev ncua ntxiv.
Nws yog txwv tsis pub npaj vias los yog cov khoom siv hauv khub sib txawv. Yog tias vias lossis cov khoom siv tau muab tso rau hauv cov khub sib txawv, EMC teeb meem yuav tshwm sim thiab kev tsis sib haum yuav tshwm sim yuav ua rau.
Qee zaum, qee qhov kev teeb tsa cov teeb liab kev hloov kho kom zoo yuav tsum tau txuas nrog hauv cov koob nrog txuas coupling capacitors. Lub Coupping Capacitor kuj yuav tsum tau teem rau kev teem hom phiaj, thiab pob ntawm lub coupling capacitor yuav tsum tsis loj heev. Nws raug nquahu kom siv 0402, 0603 kuj tseem siv tau, thiab capacitors saum toj 0805 lossis sab-to-sab yog qhov zoo tshaj plaws tsis siv.
Feem ntau, Vias yuav tsim cov impedance txuas ntxiv, yog li rau kev kub ceev cov kab sib txawv ntawm cov khub sib txawv, thiab yog tias koj xav siv vias, npaj lawv cov cim.
07
Sib npaug ntev
Hauv qee qhov kev sib cuam tshuam teeb liab high-nrawm, feem ntau, xws li lub tsheb npav, lub sijhawm tuaj txog thiab lub sijhawm taug kev yuav tsum tau txiav txim siab. Piv txwv li, hauv ib pawg ntawm cov tsheb npav muaj kev kub siab, lub sijhawm tuaj txog ntawm txhua lub sijhawm cov ntaub ntawv yuam kev kom paub meej txog lub sijhawm teeb tsa thiab lub sijhawm tuav. Txhawm rau kom tau raws li qhov kev thov no, peb yuav tsum xav txog qhov sib npaug.
Lub siab-ceev cov cim kos npe sib txawv yuav tsum ua kom lub sijhawm nruj me ntsis rau ob lub teeb liab, txwv tsis pub cov kev sib txuas lus yuav swb. Yog li, thiaj li yuav tau raws li qhov yuav tsum tau ua, ib txoj kab Serpentine tuaj yeem siv tau los ua kom tau qhov ntev sib npaug, yog li lub sijhawm lag luam.
Cov Serpentine txoj kab feem ntau yuav tsum tau muab tso rau ntawm qhov chaw ntawm qhov ploj ntawm qhov ntev, tsis yog nyob deb deb. Tsuas yog ntawm qhov chaw tuaj yeem ua cov cim qhia ntawm qhov zoo thiab qhov kawg ntawm txoj kab sib txawv tau kis tau zoo tshaj plaws.
Cov Serpentine txoj kab feem ntau yuav tsum tau muab tso rau ntawm qhov chaw ntawm qhov ploj ntawm qhov ntev, tsis yog nyob deb deb. Tsuas yog ntawm qhov chaw tuaj yeem ua cov cim qhia ntawm qhov zoo thiab qhov kawg ntawm txoj kab sib txawv tau kis tau zoo tshaj plaws.
Yog tias muaj ob txoj kab mob uas tau khoov thiab qhov kev ncua deb ntawm ob xyoos, qhov ploj ntawm txhua lwm lub sijhawm, yog li tsis tas yuav ua kom muaj kev sib npaug nyob rau lub sijhawm no.
Rau cov chaw sib txawv ntawm cov teeb meem loj-nrawm cov kab kev sib txawv, lawv yuav tsum muaj kev sib npaug ntawm nws tus kheej. Vias, series coupking capacitors, thiab interface shipinals yog tag nrho cov teeb tsa kev sib cais ntau yam muab faib ua ob ntu, yog li them nyiaj tshwj xeeb rau lub sijhawm no.
Yuav tsum yog tib yam ntev. Vim tias ntau ntawm Eda software tsuas yog them nyiaj rau seb tag nrho cov xaim yog ploj hauv DRC.
Rau kev cuam tshuam xws li LVDs zaub cov khoom siv, yuav muaj ob peb khub ntawm cov khub sib txawv yog feem ntau nruj heev, thiab lub sijhawm ncua tshwj xeeb me me. Yog li ntawd, rau cov teeb liab sib txawv, peb feem ntau xav kom lawv nyob hauv tib lub dav hlau. Ua nyiaj. Vim tias lub teeb liab kis tau ceev ntawm txheej sib txawv yog qhov sib txawv.
Thaum qee cov software Eda xam tau qhov ntev ntawm cov kab, cov kab hauv ncoo yuav tseem yuav suav hauv qhov ntev. Yog tias cov nyiaj them ntev tau ua rau lub sijhawm no, qhov tshwm sim tiag tiag yuav poob qhov ntev. Yog li them nyiaj tshwj xeeb rau lub sijhawm no thaum siv qee cov software EDA.
Lub sijhawm twg los tau, yog tias koj tuaj yeem, koj yuav tsum xaiv qhov kev rov qab ua kom tsis txhob xav txog qhov kev xav tau ua qhov ntev tshaj plaws ua kom ntev.
Yog tias qhov chaw tso cai, sim ntxiv lub voj me me ntawm lub hauv paus me me kom ua tiav txoj kev them nyiaj, es tsis txhob siv cov kab mob nab yees kom them nyiaj.