A cikin ƙirar PCB, shimfidar wuri yana taka rawa sosai a cikin duka ƙira da aikace-aikacen samfur.Kowane matakin ƙira yana buƙatar kulawa mai mahimmanci da la'akari don cimma kyakkyawan aiki.
Wayoyin hannu na dama gabaɗaya yanayi ne da ke buƙatar gujewa gwargwadon iyawa a cikin wayar PCB, kuma kusan ya zama ɗaya daga cikin ma'auni don auna ingancin wayar.To yaya tasirin wayoyi na kusurwar dama ke da shi akan watsa sigina?
Na biyu, farashin ya bambanta saboda hanyoyin samarwa daban-daban.
Hanyoyin samarwa daban-daban suna haifar da farashi daban-daban.Irin su allon da aka yi da zinari da allon kwano, sifar kewayawa da naushi, yin amfani da layukan allo na siliki da busassun layin fim za su haifar da farashi daban-daban, wanda zai haifar da bambancin farashin.
A ka'ida, alamun kusurwar dama za su canza nisa na layin watsawa, wanda zai haifar da katsewa a cikin impedance.A zahiri, ba kawai alamun kusurwar dama ba, har ma da kaifi-kwana na iya haifar da canje-canjen impedance.
Tasirin alamun kusurwar dama akan siginar yana nunawa a cikin bangarori uku: na farko, kusurwar na iya zama daidai da nauyin ƙarfin aiki akan layin watsawa, rage jinkirin lokacin tashi;na biyu, dakatarwar impedance zai haifar da tunanin sigina;
Na uku shine EMI da aka samar ta hanyar kusurwar dama.The parasitic capacitance lalacewa ta hanyar dama-kusurwar layin watsa za a iya lissafta ta da wadannan empirical dabara: C = 61W (Er) 1/2/Z0 A cikin dabara na sama, C yana nufin daidai capacitance na kusurwa ( Unit: pF),
W yana nufin faɗin alamar (raka'a: inch), εr yana nufin madaidaicin dielectric na matsakaici, kuma Z0 shine siffa ta siffa ta layin watsawa.
Yayin da nisa na layin madaidaicin kusurwar dama ya karu, za a rage matsa lamba a wurin, don haka wani abin mamaki na sigina zai faru.Za mu iya ƙididdige maƙasudin daidai bayan an ƙara faɗin layin bisa ga dabarar lissafin impedance da aka ambata a babin layin watsawa.
Sa'an nan kuma ƙididdige ƙididdige ƙididdiga bisa ga ma'auni mai mahimmanci: ρ=(Zs-Z0)/(Zs+Z0).Gabaɗaya, canjin impedance da ke haifar da wayoyi na kusurwar dama yana tsakanin 7% da 20%, don haka matsakaicin ƙididdigar tunani shine kusan 0.1.Shenzhen ANKE PCB Co.,LTD
Lokacin aikawa: Juni-25-2022
