- 28
- Sep
Uyila njani i-4-layer stack stack
Uyila njani 4-maleko PCB ukubeka
Kwithiyori, zintathu iindlela onokukhetha kuzo.
Inkqubo 1:
Umaleko wokuhambisa umbane, umaleko womhlaba kunye neendlela ezimbini zemiqondiso zilungelelaniswe ngolu hlobo lulandelayo:
TOP (umaleko wesiginali); L2 (ukubunjwa); I-L3 (umaleko wokuhambisa umbane); IBOT (umaleko wophawu).
Inkqubo 2:
Umaleko wokuhambisa umbane, umaleko womhlaba kunye neendlela ezimbini zemiqondiso zilungelelaniswe ngolu hlobo lulandelayo:
TOP (umaleko wokuhambisa umbane); L2 (umaleko womqondiso); I-L3 (Uluhlu loPhawu; IBOT (kumgangatho ophantsi).
Isicwangciso 3:
Umaleko wokuhambisa umbane, umaleko womhlaba kunye neendlela ezimbini zemiqondiso zilungelelaniswe ngolu hlobo lulandelayo:
TOP (umaleko wesiginali); L2 (umaleko wamandla); L3 (strata yokudibanisa); IBOT (umaleko wophawu).
Uluhlu lwesiginali
Umgangatho ophantsi
amandla
Uluhlu lwesiginali
Zithini izibonelelo kunye nokungalunganga kwezi ndlela zintathu?
Inkqubo 1, ingqokelela engundoqo yamanqanaba amane oyilo lwe-PCB, kukho umhlaba phantsi komphezulu wecandelo, umqondiso ophambili ngowona mgangatho uphezulu we-TOP; Kwizakhelo zobungqingqwa bokubeka umda, kucetyiswa ezi ngcebiso zilandelayo: Iipleyiti zolawulo lokunganyanzeliswa (GND ukuya KWAMANDLA) akufuneki zibengqindilili ukunciphisa isiphazamiso esisasazwayo sonikezelo lwamandla kunye nomhlaba; Qinisekisa ukuhla kwamandla eenqwelomoya.
Inkqubo 2, ukulungiselela ukufezekisa isiphumo esithile sokukhuselwa, unikezelo lwamandla kunye nomgangatho wokubekwa kumaleko aphezulu kunye ne-BOTTOM. Nangona kunjalo, le nkqubo kufuneka ifezekise isiphumo sokufuna imaski. Ubuncinane ezi ziphene zikhona:
1, umbane kunye nomhlaba ziqelelene kakhulu. I-impedance yendiza inkulu kakhulu.
2, ngenxa yempembelelo yephedi yecandelo, ukunikezelwa kwamandla kunye nomhlaba awugqityi kakhulu. Ukunganyanzeliswa komqondiso kuyayeka ngenxa yomgangatho ongagqitywanga wesalathiso.
Ukuziqhelanisa, ukubonelelwa kwamandla kunye nokusisiseko sesisombululo kunzima ukusisebenzisa njengesixhobo esipheleleyo sokuqondisa ngenxa yenani elikhulu lezixhobo ezonyuswe umphezulu. Iziphumo ezilindelweyo zokukhusela zilungile kakhulu. Kunzima ukuphumeza; Ukusetyenziswa kwayo kulinganiselwe. Nangona kunjalo, yeyona nkqubo ilungileyo yokuseta kwibhodi enye yesekethe.
Inkqubo yesi-3, efanayo nenkqubo 1, isetyenziswa apho izixhobo eziphambili zibekwe khona nge-BOTTOM okanye i-base signal wiring.