Taw qhia rau High Frequency Circuit Court PCB Design Techniques Part 1
Jan 06, 2022
Kev tsim ntawm lub rooj tsavxwm high-frequency Circuit Court yog txheej txheem nyuaj, thiab ntau yam tuaj yeem cuam tshuam ncaj qha rau kev ua haujlwm ntawm high-frequency circuit. Kev tsim thiab xaim ntawm cov kab hluav taws xob ntau zaus yog qhov tseem ceeb heev rau tag nrho cov qauv tsim. Niaj hnub no, cov kws tshaj lij thiab cov kws tshaj lij ntawm Taike Electronics tshwj xeeb tshaj yog pom zoo rau cov txheej txheem tsim hluav taws xob PCB hauv qab no rau koj, cia peb saib!
High zaus Circuit Court PCB tsim
Multilayer board thaiv kab
High-frequency circuits feem ntau muaj kev sib koom ua ke siab thiab kev xaim hluav taws xob siab. Kev siv ntau txheej boards tsis yog tsuas yog tsim nyog rau kev xaim, tab sis kuj yog ib qho txiaj ntsig zoo los txo kev cuam tshuam. Hauv cov txheej txheem PCB, kev xaiv tsim nyog ntawm cov ntawv luam tawm loj nrog qee cov txheej txheem tuaj yeem siv tag nrho cov txheej txheem nruab nrab los teeb tsa cov ntaub thaiv npog, zoo dua paub qhov ze tshaj plaws hauv av, txo cov kab mob parasitic inductance, txo cov teeb liab kis tau tus mob. ntev, thiab zoo heev txo cov teeb liab hla kev cuam tshuam. Cov txheej txheem no yog qhov tsim nyog rau kev txhim kho kev ntseeg siab ntawm high-frequency circuits. Cov ntaub ntawv qhia tau hais tias thaum siv cov khoom siv tib yam, lub suab nrov ntawm plaub-txheej pawg thawj coj saib yog 20dB qis dua li ntawm ob lub rooj tsavxwm. Txawm li cas los xij, kuj tseem muaj teeb meem. Qhov ntau tus naj npawb ntawm ib nrab-txheej ntawm PCB, qhov nyuaj ntawm kev tsim khoom thiab cov nqi tsev ntau dua. Qhov no xav kom peb tsis tsuas yog xaiv tus naj npawb tsim nyog ntawm PCB txheej, tab sis kuj yuav tsum npaj cov txheej txheem tsim nyog thiab siv cov kev cai xaim kom raug los ua kom tiav qhov tsim.
Qhov tsawg dua cov hlau lead khoov ntawm cov pins ntawm cov khoom siv hluav taws xob high-speed, qhov zoo dua
Cov hlau lead ntawm high-frequency circuit wiring zoo dua yog ib txoj kab ncaj nraim uas yuav tsum tau tig. Nws tuaj yeem tig los ntawm 45 degree polyline lossis arc. Qhov kev xav tau no tsuas yog siv los txhim kho kev txhim kho lub zog ntawm cov ntawv ci tooj liab hauv lub voj voog qis, thiab nyob rau hauv high-frequency Circuit Court, ua tau raws li qhov yuav tsum tau muaj peev xwm txo tau cov emissions sab nraud thiab kev sib txuas ntawm high-frequency signals.
Qhov luv luv ntawm cov hlau lead ntawm cov pins ntawm cov khoom siv hluav taws xob ntau zaus, qhov zoo dua
Cov hluav taws xob siv hluav taws xob ntawm cov teeb liab yog proportional rau qhov ntev ntawm cov teeb liab kab. Qhov ntev ntawm cov teeb liab ntau zaus, qhov yooj yim dua nws yog ua ke nrog cov khoom nyob ze. Yog li ntawd, rau cov kab teeb liab ntau zaus, xws li cov teeb liab moos, siv lead ua oscillators, DDR cov ntaub ntawv, LVDS kab, USB kab thiab HDMI kab, cov kab yuav tsum yog luv li sai tau.
Kev hloov ntawm cov hlau lead txheej ntawm cov pins ntawm cov khoom siv hluav taws xob ntau zaus yog tsawg li tsawg tau
Qhov thiaj li hu ua "qhov tsawg dua qhov kev hloov pauv ntawm cov txheej txheem ntawm kev coj ua, qhov zoo dua" txhais tau hais tias tsawg dua vias (Via) siv hauv cov txheej txheem kev sib txuas, qhov zoo dua. Raws li sab, ib qho ntawm tuaj yeem nqa tau txog 0.5pF faib cov peev txheej, thiab txo tus naj npawb ntawm vias tuaj yeem ua kom nrawm nrawm thiab txo qhov ua tau ntawm cov ntaub ntawv yuam kev.
High zaus Circuit Court PCB tsim
Them mloog mus rau "crosstalk" qhia los ntawm cov teeb liab kab nyob rau hauv parallel nrog nyob ze
High-frequency circuit wiring yuav tsum tau them sai sai rau "crosstalk" qhia los ntawm kev sib txuas sib txuas ntawm cov teeb liab kab. Crosstalk yog hais txog qhov tshwm sim sib txuas ntawm cov kab teeb liab uas tsis txuas ncaj qha. Vim hais tias cov teeb liab siab zaus kis tau nyob rau hauv daim ntawv ntawm electromagnetic nthwv dej raws li cov kab sib kis, cov kab teeb liab yuav ua raws li tus kav hlau txais xov, thiab lub zog ntawm electromagnetic teb yuav raug tso tawm ib ncig ntawm cov kab sib kis. Cov suab nrov tsis xav tau yog tsim los ntawm kev sib txuas ntawm electromagnetic teb ntawm cov teeb liab. hu ua crosstalk (Crosstalk). Qhov tsis sib xws ntawm PCB txheej, qhov sib nrug ntawm cov kab teeb liab, cov yam ntxwv hluav taws xob ntawm kev tsav tsheb kawg thiab qhov kawg tau txais, thiab cov teeb liab kab txiav txoj kev tag nrho muaj qee yam cuam tshuam rau crosstalk.
Cov saum toj no ib ntus qhia txog tsib lub high-frequency Circuit Court PCB tsim cov tswv yim, thiab kuv vam tias yuav muab qee qhov kev siv rau koj!