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Izizathu ezi-6 zokuba usoloko uyila i-50ohm Imedance yeRigid Flex PCB

EyeKhala 08, 2023

Iisekethe ze-Rigid-flex ziye zanda kakhulu kwiminyaka yakutshanje ngenxa yokuba idibanisa ukuguquguquka kweesekethe eziguquguqukayo kunye nokuqina.& ukuthembeka kwe-FR4 PCB. Enye yeengqwalasela eziphambili zoyilo xa udala i-rigid-flex circuit yixabiso le-impedance. Kwimiqondiso yefrikhwensi ephezulu ngokubanzi kunye neesekethe zeRF, i-50ohm lelona xabiso lixhaphakileyo elisetyenziswe ngabayili kunye nabacetyisiweyo ngumenzi, kutheni ke ukhethe i-50ohm? Ngaba i-30ohm okanye i-80ohm iyafumaneka? Namhlanje, siza kuphonononga izizathu zokuba kutheni i-50ohm impedance lolona khetho lufanelekileyo loyilo lweesekethe eziqinileyo.


Yintoni i-Impedance kwaye kutheni ibalulekile?

I-Impedans ngumlinganiselo wokumelana nokuhamba kwamandla ombane kwisekethe, echazwe kwi-Ohms kwaye yenza into ebalulekileyo ekuyilweni kweesekethe. Ibhekisa kuphawu lokuthintela umkhondo wothumelo, elilixabiso le-impedance ye-electromagnetic wave ngelixa uhambisa kumkhondo / ngocingo, kwaye inxulumene nemilo yejometri yomkhondo, imathiriyeli ye-dielectric kunye nemeko engqongileyo yomkhondo. Sinokuthi, i-impedance ichaphazela ukusebenza kakuhle kokudluliselwa kwamandla kunye nokusebenza ngokubanzi kwesekethe.

 

I-50ohm Impedance yeeSekethe eziRigid-Flex
Kukho izizathu ezininzi zokuba kutheni i-50ohm impedance ilolona khetho lufanelekileyo kwiisekethe eziguquguqukayo:

 

1.   Ixabiso eliqhelekileyo nelimiselweyo eligunyaziswe nguJAN

Ngexesha leMfazwe Yehlabathi yesiBini, ukukhethwa kwe-impedance kwakuxhomekeke ngokupheleleyo kwimfuno yokusetyenziswa, kwaye kwakungekho xabiso eliqhelekileyo.  Kodwa njengoko itekhnoloji ihambela phambili, imigangatho ye-impedance kufuneka inikwe ukuze kulinganiswe ulungelelwaniso phakathi koqoqosho kunye nokulula. Ngoko ke, uMbutho we-JAN (i-Joint Army Navy), umbutho odibeneyo womkhosi wase-United States, ekugqibeleni wakhetha i-impedance ye-50ohm njengexabiso eliqhelekileyo eliqhelekileyo lokuqwalaselwa kwe-impedance ehambelanayo, ukuzinza kokuhanjiswa komqondiso kunye nokuthintela ukubonakalisa umqondiso.     Ukusukela ngoko, i-50ohm impedance iye yavela kwinto engagqibekanga yehlabathi.


2.   Ukwandiswa komsebenzi

Ukusuka kwimbono yoyilo lwe-PCB, phantsi kwe-impedance ye-50ohm, isignali inokudluliselwa kumandla aphezulu kwisekethe, ngaloo ndlela inciphisa ukunyanzeliswa kwesignali kunye nokubonakalisa. Ngeli xesha, i-50ohm ikwayeyona nto isetyenziswa ngokuqhelekileyo igalelo le-eriyali kunxibelelwano olungenazingcingo.

Ngokuqhelekileyo, i-impedance ephantsi, ukusebenza kweendlela zokuhambisa kuya kuba ngcono. Ukuhambisa umkhondo kunye nobubanzi bomgca obunikiweyo, ngokusondeleyo kwinqwelomoya ephantsi, i-EMI ehambelanayo (i-Electro Magnetic Interference) iya kuncipha, kwaye i-crosstalk iya kuncipha nayo. Kodwa, ukusuka kwindawo yokujonga indlela yonke yomqondiso, i-impedance ichaphazela amandla okuqhuba iitshiphusi-uninzi lweetshiphusi zokuqala okanye abaqhubi abanako ukuqhuba umgca wokuhambisa ongaphantsi kwe-50ohm, ngelixa umgca wokuhambisa ophezulu bekunzima ukuwuphumeza kwaye awuzange. yenza ngokunjalo, ngoko ke ukulungelelaniswa kwe-50ohm impedance yayiyeyona nto ilungileyo ngelo xesha.


3.   Uyilo Olulula

Kuyilo lwePCB, ihlala ifuna ukuhambelana nendawo yomgca kunye nobubanzi ukunciphisa ukubonakalisa umqondiso kunye ne-crosstalk. Ke xa uyila umkhondo, siya kubala istaki seprojekthi yethu, ehambelana nobukhulu, i-substrate, iileya kunye nezinye iiparamitha ukubala i-impedance, njengetshathi engezantsi.

Ngokwamava ethu, i-50ohm kulula ukuyila isitaki, yingakho isetyenziswa kakhulu kumashishini ombane.


4.   Ukuququzelela kunye nemveliso egudileyo

Ukuqwalasela izixhobo uninzi abavelisi PCB ezikhoyo, kulula noko ukuvelisa 50ohm impedance PCB.

Njengoko sisazi, i-impedance esezantsi ifuna ukutshatisa ububanzi bomgca obanzi kunye nophakathi obhityileyo okanye omkhulu ongaguqukiyo we-dielectric, kunzima kakhulu ukudibana esithubeni kwiibhodi zesekethe eziphezulu zangoku. Ngelixa i-impedance ephezulu ifuna ububanzi bomgca omncinci kunye nobubanzi obuphakathi okanye obuncinci be-dielectric rhoqo, engaqhubekiyo kwi-EMI kunye nokunyanzeliswa kwe-crosstalk, kunye nokuthembeka kokulungiswa kuya kuba mbi kwiisekethe ze-multilayer kunye nembono yemveliso yobuninzi.

Ukulawula i-50ohm impedance ekusebenziseni i-substrate eqhelekileyo (FR4, njl.) kunye nengundoqo eqhelekileyo, ukuveliswa kobukhulu bebhodi eqhelekileyo njenge-1mm, i-1.2mm, inokuqulunqwa ububanzi bomgca oqhelekileyo we-4 ~ 10mil, ngoko ke ukuveliswa kukulungele kakhulu, kunye nokulungiswa kwezixhobo azikho iimfuno eziphezulu kakhulu.


5.   Ukuhambelana neMiqondiso ye-High-Frequency Signals

Imigangatho emininzi kunye nezixhobo zokwenziwa kweebhodi zeesekethe, izihlanganisi, kunye neentambo zenzelwe i-50ohm impedance, ngoko ke ukusebenzisa i-50ohm kuphucula ukuhambelana phakathi kwezixhobo.


6.   Isebenza kakuhle emalini

I-impedance ye-50ohm lukhetho lwezoqoqosho kunye nolufanelekileyo xa kuqwalaselwa ibhalansi phakathi kweendleko zokuvelisa kunye nokusebenza komqondiso.


Ngeempawu zayo ezizinzileyo zothumelo kunye nesantya esisezantsi sokuphazamiseka kweempawu, i-impedance ye-50ohm isetyenziswa ngokubanzi kwiinkalo ezininzi, njengeempawu zevidiyo, unxibelelwano lwedatha olukhawulezayo, njl.  Nangona kunjalo, kubalulekile ukuqaphela, ukuba ngelixa i-50ohm yenye yezona zinto zixhaphakileyo zisetyenziselwa ubunjineli be-elektroniki, kwezinye izicelo, ezifana nefrikhwensi yerediyo, amanye amaxabiso okuthintela anokufuneka ukuba ahlangabezane neemfuno ezithile.  Ngoko ke, kuyilo oluthile, kufuneka sikhethe ixabiso elifanelekileyo le-impedance ngokweyona meko.


Itekhnoloji egqwesileyo inamava okuvelisa atyebileyo kwibhodi yesekethe eguquguqukayo eqinile, nokuba yeyiphi na umaleko omnye, iileya eziphindwe kabini okanye i-FPC enemigangatho emininzi. Ukongeza, i-Best Tech ibonelela nge-FR4 PCB (ukuya kuthi ga kwi-32layers), i-PCB engundoqo yentsimbi, i-ceramic PCB kunye ne-PCB ekhethekileyo efana ne-RF PCB, i-HDI PCB, i-PCB ebhityileyo eyongezelelweyo kunye ne-PCB yobhedu enzima. Wamkelekile ukuba uqhagamshelane nathi ukuba unemibuzo PCB.



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