Tsarin laminated ya fi dacewa da dokoki guda biyu:
1. Kowane Layer na wayoyi dole ne ya kasance yana da madaidaicin ma'auni na kusa (iko ko ƙasa Layer);
2. Ya kamata a kiyaye babban layin wutar da ke kusa da ƙasa a mafi ƙarancin nisa don samar da ƙarfin haɗin gwiwa mafi girma;
Mai zuwa yana lissafin tari daga allo mai Layer biyu zuwa allo mai Layer takwas misali bayani:
1. Jirgin PCB mai gefe guda da tari na PCB mai gefe biyu
Don allunan mai layi biyu, saboda ƙarancin adadin yadudduka, babu sauran matsalar lamination. Sarrafa EMI radiation an fi la'akari da shi daga wayoyi da shimfidawa;
Daidaitawar lantarki na alluna mai Layer guda da allunan mai Layer biyu ya zama mafi shahara. Babban dalilin wannan al'amari shi ne cewa yankin madauki na siginar ya yi girma da yawa, wanda ba wai kawai yana samar da hasken lantarki mai ƙarfi ba, har ma yana sa kewayen ta kula da kutse daga waje. Don inganta daidaituwar wutar lantarki na da'ira, hanya mafi sauƙi ita ce rage yankin madauki na siginar maɓalli.
Sigina mai mahimmanci: Daga mahangar daidaitawar lantarki, siginonin maɓalli galibi suna nufin sigina waɗanda ke samar da ƙarfi mai ƙarfi da sigina waɗanda ke kula da duniyar waje. Sigina waɗanda zasu iya haifar da ƙarfi mai ƙarfi gabaɗaya sigina ne na lokaci-lokaci, kamar ƙananan sigina na agogo ko adireshi. Sigina masu kula da tsangwama siginonin analog ne tare da ƙananan matakan.
Ana amfani da allunan guda ɗaya da mai Layer-biyu a cikin ƙananan ƙirar analog ɗin da ke ƙasa da 10KHz:
1) Alamomin wutar lantarki a kan wannan Layer ana yin su da radially, kuma an rage yawan tsawon layin;
2) Lokacin gudanar da wutar lantarki da wayoyi na ƙasa, ya kamata su kasance kusa da juna; sanya waya ta ƙasa kusa da maɓallin siginar maɓalli, kuma wannan wayar ƙasa yakamata ta kasance kusa da siginar. Ta wannan hanyar, 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 sigina, ana samun madauki mai ƙaramin yanki, kuma siginar siginar tabbas zata ɗauki wannan madauki maimakon sauran wayoyi na ƙasa.
3) Idan allon kewayawa ne mai Layer Layer biyu, zaku iya shimfiɗa waya ta ƙasa tare da layin siginar da ke ɗaya gefen allon, nan da nan ƙasa da layin siginar, kuma layin farko yakamata ya kasance mai faɗi gwargwadon yiwuwa. Yankin madauki da aka kafa ta wannan hanyar daidai yake da kauri na allon kewayawa wanda aka ninka ta tsawon layin siginar.
Laminate biyu da hudu
1. SIG - GND(PWR) -PWR (GND) -SIG;
2. GND -SIG(PWR) -SIG(PWR) -GND;
Don ƙirar ƙira guda biyu na sama, matsalar yuwuwar ita ce kauri na 1.6mm (mil 62) na gargajiya. Tazarar Layer zai zama babba sosai, wanda ba shine kawai rashin dacewa ba don sarrafa impedance, haɗin haɗin gwiwa da garkuwa; musamman, babban tazara tsakanin jirage masu saukar ungulu na wutar lantarki yana rage karfin hukumar kuma ba ta dace da tace amo ba.
Don makirci na farko, yawanci ana amfani da shi ga halin da ake ciki inda akwai ƙarin kwakwalwan kwamfuta a kan jirgi. Irin wannan makirci na iya samun mafi kyawun aikin SI, ba shi da kyau sosai ga aikin EMI, galibi ta hanyar wayoyi da sauran cikakkun bayanai don sarrafawa. Babban hankali: An sanya layin ƙasa a kan haɗin haɗin haɗin siginar siginar tare da sigina mafi girma, wanda ke da amfani don sha da kuma kawar da radiation; ƙara yanki na hukumar don nuna tsarin 20H.
Amma ga bayani na biyu, yawanci ana amfani dashi lokacin da ƙarancin guntu akan allo ya yi ƙasa sosai kuma akwai isasshen yanki a kusa da guntu (sanya layin jan ƙarfe da ake buƙata). A cikin wannan makirci, babban Layer na PCB shine Layer na ƙasa, kuma na tsakiya yadudduka biyu sune sigina / iko. Wutar wutar lantarki a kan siginar siginar tana da layin layi mai faɗi, wanda zai iya sa hanyar hana wutar lantarki a halin yanzu ƙasa da ƙasa, kuma tasirin siginar siginar microstrip shima ƙasa ce, kuma siginar siginar Layer na ciki shima ana iya kiyaye shi ta hanyar kariya. Layer na waje. Daga hangen nesa na sarrafa EMI, wannan shine mafi kyawun tsarin PCB mai Layer 4 da ake samu.
Babban Hankali: Ya kamata a faɗaɗa nisa tsakanin sigina na tsakiya biyu na sigina da yadudduka masu haɗa wutar lantarki, kuma jagorar wayoyi ya kamata ya kasance a tsaye don guje wa yin magana; yankin hukumar ya kamata a sarrafa shi da kyau don yin la'akari da ka'idar 20H; idan kana so ka sarrafa igiyoyin waya, bayani na sama ya kamata a yi hankali sosai don tafiyar da wayoyi An shirya shi a ƙarƙashin tsibirin jan karfe don samar da wutar lantarki da ƙasa. Bugu da ƙari, jan ƙarfe a kan wutar lantarki ko ƙasa ya kamata a haɗa shi sosai kamar yadda zai yiwu don tabbatar da haɗin kai na DC da ƙananan mita.
Uku, laminate mai Layer shida
Don ƙira tare da mafi girman girman guntu da mitar agogo mafi girma, yakamata a yi la'akari da ƙirar allo mai Layer 6, kuma ana ba da shawarar hanyar tarawa:
1. SIG - GND - SIG - PWR - GND - SIG;
Don irin wannan makirci, irin wannan makircin laminated zai iya samun mafi kyawun siginar sigina, siginar siginar yana kusa da Layer na ƙasa, Layer na wutar lantarki da ƙasan ƙasa an haɗa su, za a iya sarrafa impedance na kowane nau'i na wiring, kuma biyu. Stratum na iya ɗaukar layukan filin maganadisu da kyau. Kuma lokacin da samar da wutar lantarki da ƙasan ƙasa suka cika, zai iya samar da mafi kyawun hanyar dawowa ga kowane siginar sigina.
2. GND - SIG - GND - PWR - SIG - GND;
Don irin wannan makirci, irin wannan makircin ya dace ne kawai ga yanayin da yawan na'urar ba ta da yawa, irin wannan lamination yana da duk fa'idodin lamination na sama, kuma jirgin saman ƙasa na saman da ƙasa yana da ɗanɗano. cikakke, wanda za'a iya amfani dashi azaman mafi kyawun kariya don amfani. Ya kamata a lura da cewa wutar lantarki ya kamata ya kasance kusa da Layer wanda ba shine babban kayan aikin ba, saboda jirgin saman Layer na ƙasa zai zama cikakke. Saboda haka, aikin EMI ya fi na farko bayani.
Takaitaccen bayani: Don tsarin tsarin allo na shida, ya kamata a rage nisa tsakanin madaurin wutar lantarki da ƙasa don samun iko mai kyau da haɗin ƙasa. Duk da haka, kodayake kaurin allon yana da 62mil kuma an rage tazarar Layer, ba abu mai sauƙi ba ne don sarrafa tazarar da ke tsakanin babban wutar lantarki da ƙasa ya zama ƙarami. Idan aka kwatanta tsarin farko da na biyu, farashin tsarin na biyu zai karu sosai. Sabili da haka, yawanci muna zaɓar zaɓi na farko lokacin tarawa. Lokacin zayyana, bi ka'idar 20H da ƙirar ƙa'idar Layer Layer madubi.
Laminate masu Layer hudu da takwas
1. Wannan ba hanya ce mai kyau ta tarawa ba saboda ƙarancin shayarwar lantarki da babban ƙarfin wutar lantarki. Tsarinsa shine kamar haka:
1.Signal 1 bangaren surface, microstrip wiring Layer
2. Sigina 2 na ciki microstrip wiring Layer, mafi kyawun layin waya (alkiran X)
3.Gida
4. Siginar 3 stripline routing Layer, mafi kyawun kewayawa Layer (Y shugabanci)
5.Signal 4 stripline routing Layer
6.Iko
7. Sigina 5 na ciki microstrip wiring Layer
8.Signal 6 microstrip trace Layer
2. Bambanci ne na hanyar tarawa ta uku. Saboda ƙari na ma'aunin tunani, yana da mafi kyawun aikin EMI, kuma ana 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. Siginar siginar 2 stripline routing Layer, mai kyau mai zagayawa Layer
4. Ƙarfin wutar lantarki, samar da kyakkyawar shayarwa na lantarki tare da ƙasa mai ƙasa a ƙasa 5. Layer Layer
6.Signal 3 stripline routing Layer, mai kyau routing Layer
7. Power stratum, tare da babban wutar lantarki impedance
8.Signal 4 microstrip wiring Layer, mai kyau wayoyi Layer
3. Hanya mafi kyau ta tarawa, saboda amfani da jiragen sama na ƙasa mai yawa, yana da kyakkyawan ƙarfin ɗaukar geomagnetic.
1.Signal 1 bangaren surface, microstrip wiring Layer, mai kyau wayoyi Layer
2. Ground stratum, mafi kyau electromagnetic kalaman sha ikon
3. Siginar siginar 2 stripline routing Layer, mai kyau mai zagayawa Layer
4.Power ikon Layer, forming kyau kwarai electromagnetic sha tare da ƙasa Layer a kasa 5.Ground ƙasa Layer
6.Signal 3 stripline routing Layer, mai kyau routing Layer
7. Ground stratum, mafi kyau electromagnetic kalaman sha ikon
8.Signal 4 microstrip wiring Layer, mai kyau wayoyi Layer
Yadda za a zabi nau'ikan alluna nawa aka yi amfani da su a cikin ƙira da yadda za a tara su ya dogara da abubuwa da yawa kamar adadin hanyoyin sadarwar sigina a kan allo, yawan na'urar, ƙimar PIN, mitar sigina, girman allo da sauransu. Dole ne mu yi la'akari da waɗannan abubuwan a cikin cikakkiyar hanya. Don ƙarin cibiyoyin sadarwar sigina, mafi girman girman na'urar, mafi girman ƙimar PIN kuma mafi girman mitar siginar, ƙirar allon multilayer yakamata a ɗauka gwargwadon yiwuwa. Don samun kyakkyawan aikin EMI, yana da kyau a tabbatar da cewa kowane siginar siginar yana da nasa bayanin martaba.