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Dab tsi yog high zaus PCB tsim| YMS

Dab tsi yog High-Frequency PCB

High-frequency PCBs feem ntau muab ntau zaus ntawm 500MHz mus rau 2 GHz, uas tuaj yeem ua tau raws li cov kev xav tau ntawm high-speed PCB tsim, microwave, radiofrequency thiab mobile applications. Thaum cov zaus siab dua 1 GHz, peb tuaj yeem txhais nws raws li qhov siab zaus.

Niaj hnub no, qhov nyuaj ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob tau nce zuj zus, thiab cov teeb liab khiav nrawm dua li niaj zaus. Yog li ntawd, yuav tsum muaj kev sib kis ntau dua. Thaum sib koom ua ke cov teeb liab tshwj xeeb rau hauv cov khoom siv hluav taws xob thiab cov khoom siv, high-frequency PCB muaj ntau yam zoo, xws li kev ua haujlwm siab, ceev ceev, qis attenuation, thiab tsis tu ncua dielectric.

High-frequency PCB - cov ntaub ntawv tshwj xeeb

Cov ntaub ntawv tshwj xeeb yog xav tau kom paub txog qhov siab zaus muab los ntawm hom ntawv luam tawm Circuit Board, Vim tias kev hloov pauv ntawm lawv qhov kev tso cai tuaj yeem cuam tshuam rau impedance ntawm PCBs. Ntau tus neeg tsim qauv PCB xaiv Rogers dielectric cov khoom vim nws muaj qis dielectric poob, qis teeb liab poob, qis hluav taws xob tsim hluav taws xob, thiab yog qhov tsim nyog rau kev hloov pauv sai sai ntawm lwm cov ntaub ntawv.

High Frequency PCB Layout Skills

1. Qhov tsawg dua cov hlau lead ntawm high-speed electronic device pins bent qhov zoo dua

Cov hlau lead ntawm cov kab hluav taws xob ntau zaus yog qhov zoo dua yog cov kab tag nrho, uas yuav tsum tau tig, thiab tuaj yeem muab tais los ntawm 45-degree kab los yog ib lub voj voog. 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, cov ntsiab lus txaus siab. Ib qho yuav tsum tau ua yog txo qis kev sib kis sab nraud thiab kev sib koom ua ke ntawm cov teeb liab ntau zaus.

2. Cov khoom siv hluav taws xob ntau zaus nruab nrab ntawm cov pin txheej sib hloov tsawg dua li qhov ua tau

Qhov kev hu ua "qhov tsawg tshaj plaws ntawm kev sib hloov ntawm cov txheej txheem ntawm cov hlau lead yog zoo dua" txhais tau hais tias tsawg dua ntawm kev siv hauv cov txheej txheem kev sib txuas, qhov zoo dua. A ntawm tuaj yeem nqa txog qhov kev faib tawm ntawm kwv yees li 0.5pF, thiab txo tus naj npawb ntawm kev tuaj yeem ua kom nrawm nrawm thiab txo qhov ua tau ntawm cov ntaub ntawv yuam kev.

3. Cov hlau lead ntawm lub high-frequency circuit device pins yog luv li sai tau

Lub radiant siv ntawm lub teeb liab yog proportional rau qhov ntev ntawm kab ntawm lub teeb liab kab. Qhov ntev ntawm cov teeb liab ntau zaus, qhov yooj yim dua yog ob peb mus rau cov khoom nyob ze rau nws, yog li rau cov moos xws li teeb liab, siv lead ua, DDR cov ntaub ntawv, Cov kab hluav taws xob siab xws li LVDS kab, USB kab, thiab HDMI kab. yuav tsum ua kom luv li sai tau.

4. Ua tib zoo mloog rau "crosstalk" qhia los ntawm cov kab teeb liab thiab luv luv nyob rau hauv parallel kab

Peb qhov teeb meem loj ntawm kev kub ceev PCB tsim

Thaum ua haujlwm ntawm kev tsim PCB kev kub ceev, muaj ntau qhov teeb meem uas koj yuav ntsib nyob rau hauv txoj kev tau txais koj cov teeb liab cuam tshuam los ntawm point A mus rau taw tes B. Tab sis ntawm lawv txhua tus, peb qhov kev txhawj xeeb saum toj kawg nkaus yuav tsum paub txog yog:

Lub sijhawm. Hauv lwm lo lus, puas yog tag nrho cov teeb liab ntawm koj lub PCB layout tuaj txog ntawm lub sijhawm tsim nyog nyob rau hauv kev sib raug zoo rau lwm cov teeb liab? Tag nrho cov teeb liab ceev ceev ntawm koj lub rooj tsav xwm layout yog tswj los ntawm lub moos, thiab yog tias koj lub sijhawm kaw, ces koj yuav zoo li tau txais cov ntaub ntawv tsis raug.

Kev ncaj ncees. Hauv lwm lo lus, koj cov teeb meem puas zoo li lawv yuav tsum tau thaum lawv tuaj txog ntawm lawv qhov chaw kawg? Yog tias lawv tsis ua, nws txhais tau tias koj lub teeb liab yuav ntsib qee qhov cuam tshuam ntawm txoj kev uas ua rau nws txoj kev ncaj ncees.

Suab nrov. Hauv lwm lo lus, koj cov teeb liab puas tau ntsib ib qho kev cuam tshuam ntawm lawv txoj kev taug los ntawm kev xa mus rau tus txais? Txhua PCB tso tawm qee lub suab nrov, tab sis thaum muaj suab nrov dhau lawm, ces koj yuav ua rau cov ntaub ntawv tsis raug cai.

Tam sim no, xov xwm zoo yog tias peb Qhov Teeb Meem Loj no koj tuaj yeem ntsib ntawm qhov kev kub ceev PCB tsim tuaj yeem kho tau los ntawm Qhov Loj Peb Qhov Loj:

Impedance. Muaj qhov zoo impedance ntawm koj lub transmitter thiab receiver yuav muaj kev cuam tshuam ncaj qha rau qhov zoo thiab kev ncaj ncees ntawm koj cov teeb liab. Qhov no tseem yuav cuam tshuam txog koj cov teeb liab li cas rau lub suab nrov.

Sib phim. Sib piv qhov ntev ntawm ob txoj kab sib txuas yuav xyuas kom meej tias koj cov kab ke tuaj txog tib lub sijhawm thiab sib txuas nrog koj cov nqi moos. Kev sib piv yog ib qho kev daws teeb meem tseem ceeb los saib rau DDR, SATA, PCI Express, HDMI, thiab USB daim ntawv thov.

Sib nrug. Qhov ze koj cov kab nyob ze rau ib leeg, qhov lawv muaj kev cuam tshuam ntau dua rau lub suab nrov thiab lwm yam teeb liab cuam tshuam. Los ntawm tsis tso koj cov kab ze ze dua li qhov lawv xav tau, koj yuav txo cov suab nrov ntawm koj lub rooj tsavxwm.

Yog tias koj xav paub ntau ntxiv txog tus nqi ntawm PCB siab zaus, thov xa koj cov ntaub ntawv PCB (Gerber hom nyiam) thiab nkag mus rau koj cov kev xav tau ntawm nextpcb.com/pcb-quote, thiab peb yuav hais koj sai li sai tau.


Post lub sij hawm: Mar-14-2022
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