Shin kun fahimci ka'idoji guda biyu na ƙirar PCB na laminated?
- 1. Kowane Layer na kwatance dole ne ya kasance yana da madaidaicin madaidaicin madaidaicin (samar da wutar lantarki ko samuwar);
- 2.The kusa da babban iko Layer da ƙasa ya kamata a kiyaye a mafi m nesa don samar da babban coupling capacitance;
Mai zuwa shine misalin tari mai Layer biyu zuwa takwas:
- allon PCB mai gefe guda daya da allon PCB mai gefe biyu
Don nau'i biyu, saboda yawan adadin ƙananan ƙananan, babu matsala lamination.Ana la'akari da kulawar radiation na EMI ne daga wayoyi da shimfidawa;
Daidaitawar wutar lantarki na faranti ɗaya - Layer da biyu - Layer Layer yana ƙara yin fice.Babban dalilin wannan al'amari shi ne cewa wurin madauki na siginar ya yi girma da yawa, wanda ba wai kawai yana samar da hasken wutar lantarki mai ƙarfi ba, har ma yana sa kewaye ta kula da kutse daga waje.Hanya mafi sauƙi don inganta daidaituwar lantarki na layi shine rage madauki na sigina mai mahimmanci.
Sigina mai mahimmanci: Daga mahangar daidaitawar lantarki, sigina mai mahimmanci galibi tana nufin siginar da ke samar da radiation mai ƙarfi kuma mai kula da duniyar waje.Alamomin da zasu iya samar da radiation mai ƙarfi yawanci sigina ne na lokaci-lokaci, kamar ƙananan sigina na agogo ko adireshi.Alamun tsangwama sune waɗanda ke da ƙananan matakan siginar analog.
Akan yi amfani da faranti guda ɗaya da ninki biyu a ƙananan ƙirar ƙirar mitar ƙasa da 10KHz:
1) Gudanar da igiyoyin wutar lantarki akan layi ɗaya a cikin hanyar radial, kuma rage yawan adadin tsawon layin;
2) Lokacin tafiya da wutar lantarki da waya ta ƙasa, kusa da juna;Ajiye waya ta ƙasa kusa da maɓallin siginar maɓalli kamar yadda zai yiwu.Don haka, an samar da ƙaramin yanki na madauki kuma an rage hankali na yanayin bambance-bambancen radiation zuwa tsangwama na waje.Lokacin da aka ƙara waya ta ƙasa kusa da siginar, za a samar da wani yanki mai ƙarami, kuma dole ne a bi da siginar ta wannan kewaye maimakon sauran hanyar ƙasa.
3) Idan allon kewayawa ne mai nau'i biyu, yana iya kasancewa a gefe guda na allon kewayawa, kusa da layin siginar da ke ƙasa, tare da zanen layin siginar waya ta ƙasa, layin da zai yiwu.Sakamakon kewayawa yana daidai da kauri na allon kewayawa wanda aka ninka ta tsawon layin sigina.
- B. Lamination na hudu yadudduka
1. Sig-gnd (PWR)-PWR (GND)-SIG;
2. GND-SIG(PWR)-SIG(PWR)-GND;
Ga duka waɗannan ƙirar ƙira, yuwuwar matsalar ita ce kauri na 1.6mm (mil 62) na gargajiya.Tazarar Layer zai zama babba, ba kawai mai dacewa don sarrafa impedance ba, haɗin kai da garkuwa;Musamman, babban tazara tsakanin ma'aunin wutar lantarki yana rage ƙarfin farantin kuma ba ya dace da tace amo.
Don makirci na farko, yawanci ana amfani dashi a cikin yanayin babban adadin kwakwalwan kwamfuta a kan jirgi.Wannan makirci na iya samun ingantaccen aikin SI, amma aikin EMI bai da kyau sosai, wanda galibi ana sarrafa shi ta hanyar wayoyi da sauran bayanai.Babban hankali: An sanya samuwar a cikin siginar siginar mafi girman siginar siginar, mai dacewa da sha da kuma kawar da radiation;Ƙara yankin faranti don nuna ƙa'idar 20H.
Don makirci na biyu, yawanci ana amfani da shi inda ƙarancin guntu a kan allo ya yi ƙasa sosai kuma akwai isasshen yanki a kusa da guntu don sanya murfin jan ƙarfe da ake buƙata.A cikin wannan makirci, babban Layer na PCB duk stratum ne, kuma yadudduka biyu na tsakiya sune sigina / ƙarfin wuta.Ana amfani da wutar lantarki a kan siginar siginar tare da layi mai fadi, wanda zai iya sa hanyar da ake amfani da wutar lantarki a halin yanzu ta yi ƙasa da ƙasa, kuma ƙaddamar da siginar microstrip yana da ƙananan, kuma yana iya kare hasken siginar ciki ta hanyar waje. Layer.Daga mahangar sarrafa EMI, wannan shine mafi kyawun tsarin PCB mai Layer 4 da ake da shi.
Babban hankali: tsakiyar sigina biyu na sigina, ya kamata a buɗe tazarar daɗaɗɗen wutar lantarki, jagorar layin yana tsaye, guje wa yin magana;Yankin panel mai dacewa, yana nuna dokokin 20H;Idan za a sarrafa impedance na wayoyi, a hankali sanya wayoyi a ƙarƙashin tsibiran jan ƙarfe na wutar lantarki da ƙasa.Bugu da kari, wutar lantarki ko kwanciya tagulla yakamata a haɗa haɗin kai gwargwadon yuwuwar don tabbatar da haɗin DC da ƙarancin mitar.
- C. Lamination na faranti shida
Don ƙirar babban girman guntu da mitar agogo mai girma, ƙirar allon 6-Layer ya kamata a yi la'akari da shi.Ana ba da shawarar hanyar lamination:
1.SIG-GND-SIG-PWR-GND-SIG;
Don wannan makirci, tsarin lamination yana samun kyakkyawar siginar siginar, tare da siginar siginar da ke kusa da Layer na ƙasa, ƙarfin wutar lantarki ya haɗa tare da Layer na ƙasa, za a iya sarrafa impedance na kowane Layer na routing da kyau, kuma duka yadudduka na iya ɗaukar layukan magnetic da kyau. .Bugu da ƙari, zai iya samar da mafi kyawun hanyar dawowa ga kowane siginar sigina a ƙarƙashin yanayin cikakken samar da wutar lantarki da samuwar.
2. GND-SIG-GND-PWR-SIG-GND;
Don wannan makirci, wannan makirci yana aiki ne kawai ga yanayin inda yawancin na'urar ba ta da yawa.Wannan Layer yana da duk fa'idodin Layer na sama, kuma jirgin saman saman saman da ƙasa ya cika cikakke, wanda za'a iya amfani dashi azaman mafi kyawun kariya.Yana da mahimmanci a lura cewa wutar lantarki ya kamata ya kasance kusa da Layer wanda ba shine babban jirgin sama ba, saboda jirgin kasa zai kasance mafi cikakke.Saboda haka, aikin EMI ya fi tsarin farko.
Takaitaccen bayani: Don tsarin tsarin allo na shida, ya kamata a rage tazara tsakanin madaurin wutar lantarki da ƙasa don samun iko mai kyau da haɗin ƙasa.Duk da haka, kodayake kaurin farantin 62mil da tazarar da ke tsakanin yadudduka ya ragu, har yanzu yana da wahala a sarrafa tazarar da ke tsakanin babban tushen wutar lantarki da ƙasan ƙasa kaɗan.Idan aka kwatanta da tsarin farko da na biyu, farashin tsarin na biyu ya karu sosai.Saboda haka, yawanci muna zaɓar zaɓi na farko lokacin da muka tara kaya.Yayin ƙira, bi ka'idodin 20H da ka'idodin Layer na madubi.
- D. Lamination na yadudduka takwas
1,DUe ga matalauta electromagnetic sha iya aiki da kuma babban ikon impedance, wannan ba hanya ce mai kyau na lamination.Tsarinsa shine kamar haka:
1.Signal 1 bangaren surface, microstrip wiring Layer
2.Signal 2 na ciki microstrip routing Layer, mai kyau routing Layer (X shugabanci)
3.Gida
4.Signal 3 Strip line routing Layer, mai kyau routing Layer (Y shugabanci)
5.Signal 4 Cable routing Layer
6.Iko
7.Signal 5 na ciki microstrip wiring Layer
8.Signal 6 Microstrip wiring Layer
2. Bambanci ne na yanayin stacking na uku.Saboda ƙari na abin da aka yi la'akari, yana da mafi kyawun aikin EMI, kuma za'a iya sarrafa halayen halayen kowane siginar siginar da kyau.
1.Signal 1 bangaren surface, microstrip wiring Layer, mai kyau wayoyi Layer
2.Ground stratum, mai kyau electromagnetic kalaman sha ikon
3.Signal 2 Cable routing Layer.Kyakkyawan layin kewayawa na USB
4.Power Layer, da kuma wadannan strata kunshi m electromagnetic sha 5.Ground stratum
6.Signal 3 Cable routing Layer.Kyakkyawan layin kewayawa na USB
7.Power samuwar, tare da babban iko impedance
8.Signal 4 Microstrip na USB Layer.Kyakkyawan Layer na USB
3,Tya fi kyau yanayin stacking, saboda amfani da Multi-Layer kasa tunani jirgin sama yana da kyau sosai geomagnetic iya sha.
1.Signal 1 bangaren surface, microstrip wiring Layer, mai kyau wayoyi Layer
2.Ground stratum, mai kyau electromagnetic kalaman sha ikon
3.Signal 2 Cable routing Layer.Kyakkyawan layin kewayawa na USB
4.Power Layer, da kuma wadannan strata kunshi m electromagnetic sha 5.Ground stratum
6.Signal 3 Cable routing Layer.Kyakkyawan layin kewayawa na USB
7.Ground stratum, mafi kyau electromagnetic kalaman sha ikon
8.Signal 4 Microstrip na USB Layer.Kyakkyawan Layer na USB
Zaɓin nau'in yadudduka nawa don amfani da yadda ake amfani da yadudduka ya dogara da adadin cibiyoyin sadarwa na sigina a kan allo, ƙimar na'urar, ƙimar PIN, mitar sigina, girman allo da sauran abubuwa da yawa.Muna bukatar mu yi la'akari da waɗannan abubuwan.Yawan adadin cibiyoyin sadarwar sigina, mafi girman girman na'urar, mafi girman ƙimar PIN, mafi girman ƙirar ƙirar siginar ya kamata a ɗauka gwargwadon yiwuwa.Don kyakkyawan aiki na EMI yana da kyau a tabbatar da cewa kowane siginar siginar yana da nasa na'urar tunani.
