Best Technology ndi mmodzi wa opanga bwino pcb ndi kusindikizidwa dera bolodi ogulitsa China
Chilankhulo
Best Technology ndi mmodzi wa opanga bwino pcb ndi kusindikizidwa dera bolodi ogulitsa China
Zozungulira zolimba-flex zakhala zikudziwika kwambiri m'zaka zaposachedwa chifukwa zimaphatikiza kusinthasintha kwa ma frequency osinthika komanso kusasunthika.& kudalirika kwa FR4 PCB. Chimodzi mwazofunikira pakupanga kozungulira kokhazikika ndi mtengo wa impedance. Pa ma siginoloji apamwamba kwambiri komanso ma frequency a RF, 50ohm ndiye mtengo wodziwika bwino womwe opanga amaugwiritsa ntchito ndikupangira, ndiye bwanji kusankha 50ohm? Kodi 30ohm kapena 80ohm ilipo? Lero, tiwona zifukwa zomwe 50ohm impedance ndi njira yabwino kwambiri yopangira mabwalo okhazikika.
Kodi Impedance ndi chiyani ndipo chifukwa chiyani ndikofunikira?
Impedans ndi muyeso wa kukana kuyenda kwa mphamvu zamagetsi mu dera, zomwe zimafotokozedwa mu Ohms ndipo zimapanga chinthu chofunika kwambiri pakupanga mabwalo. Zimatanthawuza kulepheretsa kwa njira yotumizira, yomwe ndi mphamvu yamagetsi yamagetsi pamene ikudutsa mu trace / waya, ndipo imagwirizana ndi mawonekedwe a geometric of trace, dielectric material ndi malo ozungulira a trace. Tikhoza kunena kuti, impedance imakhudza mphamvu ya kutengerapo mphamvu ndi ntchito yonse ya dera.
50ohm Impedance ya Madera Olimba-Flex
Pali zifukwa zingapo zomwe 50ohm impedance ndiyo njira yabwino yopangira mabwalo osinthasintha:
1. Mtengo wokhazikika komanso wokhazikika wovomerezeka ndi JAN
Pa Nkhondo Yachiwiri Yapadziko Lonse, kusankha kosokoneza kudalira pakufunika kogwiritsa ntchito, ndipo panalibe mtengo wokhazikika. Koma pamene teknoloji ikupita patsogolo, miyezo ya impedance iyenera kuperekedwa kuti athe kugwirizanitsa pakati pa zachuma ndi zosavuta. Choncho, bungwe la JAN (Joint Army Navy), gulu logwirizana la asilikali a United States, potsiriza linasankha 50ohm impedance monga mtengo wamba woganizira za kufananiza, kusasunthika kwa kufalikira kwa ma signal ndi kupewa kuwonetsetsa. Kuyambira pamenepo, 50ohm impedance yasintha kukhala yosasintha padziko lonse lapansi.
2. Kukulitsa magwiridwe antchito
Kuchokera pamawonekedwe a PCB, pansi pa 50ohm impedance, siginecha imatha kupatsirana ndi mphamvu yayikulu kwambiri pozungulira, motero kuchepetsa kutsika kwa siginecha ndi kusinkhasinkha. Pakadali pano, 50ohm ndiyenso njira yomwe imagwiritsidwa ntchito kwambiri ndi antenna pamalumikizidwe opanda zingwe.
Nthawi zambiri, kutsika kwa impedance, magwiridwe antchito amapatsirana azikhala bwino. Pa njira yotumizira yomwe ili ndi m'lifupi mwake, kuyandikira pafupi ndi ndege yapansi, EMI yofananira (Electro Magnetic Interference) idzachepa, ndipo crosstalk idzachepanso. Koma, poyang'ana njira yonse ya siginecha, kusokoneza kumakhudza mphamvu ya tchipisi - ambiri tchipisi toyambilira kapena madalaivala sangathe kuyendetsa chingwe chopatsira chomwe chili chotsika kuposa 50ohm, pomwe chingwe cholumikizira chapamwamba chinali chovuta kugwiritsa ntchito ndipo sichinatero. gwiraninso bwino, chifukwa chake kunyengerera kwa 50ohm impedance inali chisankho chabwino kwambiri panthawiyo.
3. Mapangidwe Osavuta
Pamapangidwe a PCB, nthawi zonse imayenera kufananiza ndi malo a mzere ndi m'lifupi kuti muchepetse kuwonetsera kwa siginecha ndi crosstalk. Chifukwa chake popanga zidziwitso, tidzawerengera kuchuluka kwa polojekiti yathu, yomwe ili molingana ndi makulidwe, gawo lapansi, zigawo ndi magawo ena kuti tiwerengere zopinga, monga tchati pansipa.
Malinga ndi zomwe takumana nazo, 50ohm ndiyosavuta kupanga stack, ndichifukwa chake imagwiritsidwa ntchito kwambiri m'mafakitale amagetsi.
4. Kuwongolera ndi kupanga kosalala
Poganizira zida za opanga PCB ambiri omwe alipo, ndizosavuta kupanga 50ohm impedance PCB.
Monga tikudziwira, kutsika kwapang'onopang'ono kumafunika kufananiza m'lifupi mwa mzere wotakata ndi wocheperako wapakati kapena wokhazikika wa dielectric, ndizovuta kwambiri kukumana mumlengalenga pama board amagetsi apano. Ngakhale kutsekeka kwapamwamba kumafunikira mizere yocheperako komanso yokulirapo yapakati kapena yaying'ono ya dielectric yosasinthasintha, yomwe siithandizira EMI ndi kuponderezana kwa crosstalk, ndipo kudalirika kwa kukonza kumakhala koyipa pamabwalo amitundu yambiri komanso momwe angapangire zinthu zambiri.
Control 50ohm impedance ntchito gawo lapansi wamba (FR4, etc.) ndi pachimake wamba, kupanga wamba bolodi makulidwe monga 1mm, 1.2mm, akhoza kupangidwa wamba mzere m'lifupi mwake 4 ~ 10mil, kotero kupeka ndi yabwino kwambiri, ndi processing wa zipangizo si zofunika kwambiri.
5. Kugwirizana ndi Zizindikiro Zapamwamba-Frequency
Miyezo yambiri ndi zida zopangira ma board ozungulira, zolumikizira, ndi zingwe zidapangidwira 50ohm impedance, chifukwa chake kugwiritsa ntchito 50ohm kumathandizira kulumikizana pakati pazida.
6. Zotsika mtengo
The 50ohm impedance ndi chisankho chachuma komanso choyenera mukaganizira za kusanja pakati pa mtengo wopangira ndi magwiridwe antchito.
Ndi mawonekedwe ake okhazikika opatsirana komanso kutsika kwa ma siginecha otsika, kusokoneza kwa 50ohm kumagwiritsidwa ntchito kwambiri m'magawo ambiri, monga ma siginolo a kanema, kulumikizana kwa data mwachangu, ndi zina zambiri. Komabe, ndikofunikira kuzindikira, kuti ngakhale 50ohm ndi imodzi mwazoletsa zomwe zimagwiritsidwa ntchito kwambiri muukadaulo wamagetsi, m'mapulogalamu ena, monga ma frequency a wayilesi, zikhalidwe zina zosokoneza zingafunikire kukwaniritsa zofunikira zenizeni. Choncho, pamapangidwe enieni, tiyenera kusankha mtengo woyenera wa impedance malinga ndi momwe zilili.
Ukadaulo Wabwino Kwambiri uli ndi luso lopanga zinthu zambiri mu board yozungulira yokhazikika, iliyonse yosanjikiza, magawo awiri kapena FPC yamitundu yambiri. Kuphatikiza apo, Best Tech imapereka FR4 PCB (mpaka 32layers), PCB yachitsulo, PCB ya ceramic ndi PCB yapadera monga RF PCB, HDI PCB, PCB yowonda kwambiri komanso yamkuwa yolemera. Takulandirani kuti mutiuze ngati muli ndi mafunso a PCB.
