Ijubane le-PCB ukuxazulula. Nayi imithetho eyisishiyagalolunye:

Umthetho 1: Umthetho wokuvikela umzila wesivinini esiphezulu

Ekudizayineni kwe-PCB enejubane elikhulu, imigqa yesiginali esheshayo efana namawashi idinga ukuvikelwa. Uma kungavikelwe noma kuvikelwe kuphela ingxenye, ukuvuza kwe-EMI kuzodalwa. Kunconywa ukuthi izintambo ezivikelwe zibholwe ukuze zakhiwe njalo ngama-1000mil.

Umthetho 2: imithetho evaliwe yomzila wamasignali ashesha kakhulu

Imithetho yomzila ovaliwe we-high-speed signals

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Imithetho yomzila ovaliwe we-high-speed signals

Ngenxa yokwanda kokuqina kwebhodi le-PCB, onjiniyela abaningi be-PCB LAYOUT bathambekele ekwenzeni iphutha ngenkathi kwenziwa izintambo. Ngamanye amagama, inethiwekhi yesiginali esisheshayo efana nesiginali yewashi yakha imiphumela evaliwe lapho izintambo ze-PCB ezinemigqa eminingi. Imiphumela enjalo evaliwe izokhiqiza i-antenna yendandatho futhi inyuse ukuqina kwemisebe ye-EMI.

Umthetho 3: imithetho evulekile yomzila wamasignali ashesha kakhulu

Imithetho yomzila ovulekile wezimpawu ezisheshayo

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Imithetho yomzila ovulekile wezimpawu ezisheshayo

Umthetho 2 ubalule ukuthi ukuvala iluphu kwezimpawu ezisheshayo kuzodala imisebe ye-EMI, kuyilapho i-open-loop nayo izodala imisebe ye-EMI.

Kwinethiwekhi yesiginali esheshayo, efana nesiginali yewashi, uma umphumela weluphu ovulekile usukhiqizwe kumzila we-PCB enezingqimba eziningi, i-antenna eqondile izokhiqizwa futhi amandla emisebe ye-EMI azokwandiswa.

Umthetho 4: umthetho wokuqhubeka we-impedance wokuqhubeka kwamasiginali asheshayo

Isici se-impedance ukuqhubeka komthetho wamasiginali wejubane

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Isici se-impedance ukuqhubeka komthetho wamasiginali wejubane

Ngezimpawu ezisheshayo, ukuqhubeka kwe-impedance yesici kufanele kuqinisekiswe lapho kushintshwa phakathi kwezendlalelo; ngaphandle kwalokho, kuzokwandiswa imisebe ye-EMI. Lokho ukuthi, ububanzi bezintambo besendlalelo esifanayo kufanele buqhubeke, futhi i-impedance yezintambo yezendlalelo ezahlukahlukene kufanele iqhubeke.

Umthetho 5: Imiyalo yokuqondisa umzila yokwakhiwa kwe-PCB esheshayo

Isici se-impedance ukuqhubeka komthetho wamasiginali wejubane

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Izintambo eziphakathi kwezendlalelo ezimbili eziseduze kufanele zihanjiswe zibheke phezulu. Ngaphandle kwalokho, i-crosstalk kungenzeka futhi imisebe ye-EMI ingakhula. Ngamafuphi, izendlalelo ezincikene nezintambo zilandela umkhondo wiring ovundlile, ovundlile noqonde mpo, futhi izintambo eziqondile zingavimbela i-crosstalk phakathi kwemigqa.

Umthetho 6: Imithetho ye-Topology ekwakhiweni kwe-PCB esheshayo

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Isici se-impedance ukuqhubeka komthetho wamasiginali wejubane

Ekuklanyweni kwe-PCB enejubane elikhulu, ukulawulwa kwe-impedance yebhodi lesifunda nokuklanywa kwesakhiwo sokwakheka kwezinto ngaphansi kokulayishwa okuningi kunquma ngqo impumelelo noma ukwehluleka komkhiqizo.

I-daisy chain topology iboniswa esithombeni, esivame ukuzuzisa abambalwa be-Mhz. Kunconywa ukusebenzisa ukwakheka kwezinkanyezi okulinganayo ekugcineni emuva ekwakhiweni kwe-PCB enejubane elikhulu.

Umthetho 7: Umthetho we-Resonance wobude bomugqa

Umthetho we-Resonance wobude bomugqa

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Umthetho we-Resonance wobude bomugqa

Bheka ukuthi ubude bolayini wesiginali nobuningi besiginali kuyakha yini umsindo, okungukuthi lapho ubude bezintambo kuyizikhathi eziphelele zobude besignali engu-1/4, le wiring izokhiqiza ukugqama, futhi i-resonance izokhipha amaza kagesi kagesi, ikhiqize ukuphazamiseka.

Umthetho 8: Umthetho wendlela yokubuyela emuva

Umthetho wendlela yokubuyela emuva

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Umthetho wendlela yokubuyela emuva

Zonke izimpawu ezisheshayo kumele zibe nendlela yokuhlehlela emuva enhle. Nciphisa indlela yokubuyela emuva yamasignali ashesha kakhulu njengamawashi. Ngaphandle kwalokho imisebe izokwanda kakhulu, futhi inani lemisebe liyalingana nendawo ezungezwe indlela yesiginali kanye nendlela yokubuyela emuva.

Umthetho 9: Imithetho yokubeka i-capacitor yediski yokuqedwa yedivayisi

Imithetho yokubeka ama-capacitor we-decoupling wamadivayisi

Iyini imithetho ye-EMI yokwakhiwa kwe-PCB esheshayo

Imithetho yokubeka ama-capacitor we-decoupling wamadivayisi

Indawo ye-decoupling capacitor ibaluleke kakhulu. Ukubekwa okungafanele akukwazi ukufeza umphumela wokudilizwa. Umgomo uthi: eduze kwephini lokuphakela ugesi, kanye nentambo kagesi ye-capacitor kanye nomhlabathi ozungezwe indawo encane kunazo zonke.