Kodi High-Frequency PCB ndi chiyani

Ma PCB othamanga kwambiri nthawi zambiri amapereka ma frequency osiyanasiyana a 500MHz mpaka 2 GHz, omwe amatha kukwaniritsa zosowa zamapangidwe othamanga kwambiri a PCB, ma microwave, ma radiofrequency ndi kugwiritsa ntchito mafoni. Ma frequency ndi apamwamba kuposa 1 GHz, titha kuwatanthauzira ngati ma frequency apamwamba.

Masiku ano, zovuta zamagulu amagetsi ndi masiwichi zikuchulukirachulukira, ndipo mayendedwe azizindikiro mwachangu amafunikira kuposa masiku onse. Choncho, kufala kwafupipafupi kumafunika. Mukaphatikiza zofunikira zamtundu wamagetsi muzinthu zamagetsi ndi zinthu, PCB yothamanga kwambiri imakhala ndi zabwino zambiri, monga kuchita bwino kwambiri, kuthamanga kwambiri, kutsika pang'ono, komanso kukhazikika kwa dielectric.

High-frequency PCB - zipangizo zapadera

Zida zapadera zimafunika kuzindikira mafupipafupi operekedwa ndi mtundu uwu wa bolodi losindikizidwa, Chifukwa kusintha kulikonse kwa chilolezo chawo kungakhudze kusokoneza kwa PCB. Opanga ambiri a PCB amasankha zida za Rogers dielectric chifukwa zimakhala ndi kutayika kwa dielectric pang'ono, kutayika kwa ma siginecha otsika, kutsika mtengo kopangira madera, ndipo ndizoyeneranso kusinthira mwachangu ntchito zofananira pakati pa zida zina.

Maluso Opanga Mafupipafupi a PCB

1. Kuchepa kwachitsogozo pakati pa mapini othamanga kwambiri pazida zamagetsi kumapindika bwino

Waya wotsogola wa mawaya amtundu wapamwamba kwambiri makamaka ndi mzere wathunthu, womwe umayenera kutembenuzidwa, ndipo ukhoza kupindika ndi mzere wa 45-degree kapena arc yozungulira. Chofunikirachi chimangogwiritsidwa ntchito kupititsa patsogolo mphamvu yokonza zojambulazo zamkuwa m'magawo otsika kwambiri, komanso m'madera othamanga kwambiri, zomwe zilipo zimakhutitsidwa. Chofunikira chimodzi ndikuchepetsa kutumizirana kwakunja ndi kulumikizana kwa ma frequency apamwamba.

2. The mkulu pafupipafupi dera chipangizo pakati pini zigawo alternately zochepa ngati n'kotheka

Zomwe zimatchedwa "kusinthasintha pang'ono pakati pa zigawo za mayendedwe ndikwabwino" zikutanthauza kuti zochepa zomwe zimagwiritsidwa ntchito polumikizana ndi gawo, zimakhala bwino. Kudutsa kungathe kubweretsa mphamvu yogawidwa ya 0.5pF, ndipo kuchepetsa chiwerengero cha kudzera kungathe kuonjezera liwiro ndikuchepetsa kuthekera kwa zolakwika za deta.

3. Chitsogozo pakati pa zikhomo za chipangizo chozungulira chapamwamba kwambiri ndi chachifupi momwe mungathere

Kuwala kwamphamvu kwa siginecha kumayenderana ndi kutalika kwa katsatidwe ka mzere wa chizindikiro. Kutalikirapo kwa ma siginecha apamwamba kwambiri, ndikosavuta kulumikizana ndi gawo lomwe lili pafupi nalo, kotero mawotchi monga ma sigino, kristalo, data ya DDR, mizere yama sigino apamwamba kwambiri monga mizere ya LVDS, mizere ya USB, ndi mizere ya HDMI. zimafunika kukhala zazifupi momwe zingathere.

4. Samalani ku "crosstalk" yomwe imayambitsidwa ndi mzere wa chizindikiro ndi mzere waufupi wofanana

Mavuto Atatu Akuluakulu a High Speed ​​​​PCB Design

Mukamagwiritsa ntchito mapangidwe a PCB othamanga kwambiri, pali zovuta zambiri zomwe mungakumane nazo panjira yoti ma sign anu azilumikizana kuchokera ku point A kupita kumalo B.

Nthawi. Mwanjira ina, kodi ma siginoloji onse pa masanjidwe anu a PCB akufika pa nthawi yoyenera mogwirizana ndi ma siginoloje ena? Zizindikiro zonse zothamanga kwambiri pamakonzedwe anu a board zimayendetsedwa ndi wotchi, ndipo ngati nthawi yanu yazimitsidwa, ndiye kuti mukhala mukulandila data yowonongeka.

Umphumphu. Mwa kuyankhula kwina, kodi zizindikiro zanu zimawoneka monga momwe ziyenera kukhalira zikafika komwe akupita? Ngati satero, ndiye kuti chizindikiro chanu chikhoza kukumana ndi zosokoneza zomwe zidawononga kukhulupirika kwake.

Phokoso. Mwanjira ina, kodi ma siginecha anu adakumana ndi zosokoneza zamtundu uliwonse paulendo wawo kuchokera pa transmitter kupita ku wolandila? PCB iliyonse imatulutsa phokoso lamtundu wina, koma phokoso likachuluka, ndiye kuti mumawonjezera mwayi wowononga deta.

Tsopano, nkhani yabwino ndiyakuti Mavuto Aakulu Atatu awa omwe mungakumane nawo pamapangidwe a PCB othamanga amatha kuwongoleredwa ndi Mayankho Aakulu Atatu awa:

Kusokoneza. Kukhala ndi impedance yoyenera pakati pa transmitter yanu ndi wolandila kudzakhudza mwachindunji mtundu ndi kukhulupirika kwa ma siginecha anu. Izi zikhudzanso momwe ma siginecha anu amakhudzira phokoso.

Kufananiza. Kufananiza kutalika kwa njira ziwiri zophatikizidwira kuwonetsetsa kuti zolemba zanu zifika nthawi imodzi komanso zogwirizana ndi mawotchi anu. Kufananitsa ndi yankho lofunikira kuti muyang'ane pa DDR, SATA, PCI Express, HDMI, ndi mapulogalamu a USB.

Mipata. Pamene zizindikiro zanu zikuyandikirana, m'pamenenso zimakhala zosavuta kumva phokoso ndi njira zina zosokoneza zizindikiro. Posayika zotsalira zanu moyandikira kuposa momwe ziyenera kukhalira, muchepetse phokoso pa bolodi lanu.

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