Menene PCB Back hakowa?
Tsarin haƙa ramin baya na PCB, wanda kuma ake kira haƙa zurfin da aka sarrafa, ya ƙunshi cire sandar a cikin PCBs masu layi da yawa don ƙirƙirar vias. Manufar haƙa ramin baya shine sauƙaƙe kwararar sigina tsakanin layuka daban-daban na allon ba tare da tsangwama daga sandunan da ba a so ba.
Domin samar da cikakken bayani game da tsarin haƙa baya, bari mu yi la'akari da misali.
A ce akwai PCB mai layuka 12 tare da rami mai ratsawa wanda ke haɗa layukan farko da na 12. Manufar ita ce a haɗa layukan farko kawai zuwa layukan 9, yayin da ake kiyaye layukan 10 zuwa na 12 ba tare da haɗin ba. Duk da haka, layukan da ba a haɗa ba suna ƙirƙirar "ƙusoshi" waɗanda za su iya tsoma baki ga hanyar siginar, wanda ke haifar da matsalolin amincin siginar. Haƙa ramukan baya ya ƙunshi haƙa waɗannan ƙusoshin daga gefen allon don inganta watsa siginar.
Menene manufar haƙa baya na PCB?
Ana amfani da haƙa baya na PCB don cire ɓangaren da ba a yi amfani da shi ba na ramin da aka rufe (via) wanda ya wuce ƙarshen layin PCB. Wannan tsari yana taimakawa rage matsalolin amincin sigina, kamar su stub resonance da reflection na sigina, waɗanda zasu iya faruwa a cikin ƙirar dijital mai sauri.
Menene "rabobin al'amari"?
Tambayoyi da Amsoshi game da allunan da aka buga › TERMINOLOGY
Alaƙar da ke tsakanin diamita na ramin da tsawonsa. Idan mai ƙera ya faɗi cewa samar da su yana da "rabo mai kyau" na 8:1, yana nufin, misali, diamita na ramin shine 0.20 mm a cikin PCB mai kauri 1.60 mm.
Ga tsarin HDI, rabon al'amari na microvia ya takaita zuwa 1:1, amma 0.7-0.8:1 ya fi dacewa fiye da sauƙaƙe sanya plating.
Mene ne fa'idodin haƙa baya na PCB?
Amfanin haƙa baya na PCB sun haɗa da ingantaccen siginar sigina, rage asarar shigarwa, haɓaka sarrafa magana ta hanyar sadarwa, da kuma ƙara yawan bandwidth. Ta hanyar cire ɓangaren da ba a yi amfani da shi ba na ganga ta hanyar sadarwa, haƙa baya yana rage sautin stub da kuma hasken sigina, wanda ke haifar da watsa sigina cikin tsafta da daidaito.