Ta hanyar ƙirar rami na HDI PCB

A cikin ƙirar PCB mai girma, ana amfani da PCB mai yawan Layer sau da yawa, kuma ta hanyar rami muhimmin abu ne a ƙirar PCB mai yawan Layer. Ramin da ke cikin PCB ya ƙunshi sassa uku ne: rami, yankin walda a kusa da rami da yanki keɓewar WUTA. Na gaba, za mu fahimci PCB mai girma ta hanyar matsalar rami da buƙatun ƙira.

Tasirin ta hanyar rami a cikin HDI PCB

A cikin allon multilayer HDI PCB, haɗin haɗin tsakanin Layer ɗaya da wani Layer yana buƙatar haɗi ta ramuka. Lokacin da mitar ta kasa da 1 GHz, ramukan na iya taka rawa mai kyau a cikin haɗin kai, kuma ana iya yin watsi da ƙarfin parasitic da inductance. Lokacin da mitar ta fi 1 GHz girma, ba za a iya yin watsi da tasirin parasitic na ramin sama da ƙasa akan amincin siginar ba. A wannan lokaci, ramin-rami yana ba da katsewar shinge mai tsauri akan hanyar watsawa, wanda zai haifar da tunanin sigina, jinkiri, raguwa da sauran matsalolin amincin sigina.

Lokacin da siginar da aka watsa zuwa wani Layer ta cikin rami, da tunani Layer na siginar line kuma hidima a matsayin mayar da hanyar siginar ta cikin rami, da kuma mayar da halin yanzu zai gudana tsakanin tunani yadudduka ta capacitive hada guda biyu, haifar da ƙasa bama-bamai sauran matsalolin.

Nau'in-Hole, Gabaɗaya, ta rami ya kasu kashi uku: ta rami, rami makaho da rami binne.

Ramin makaho: rami dake saman saman da kasa na allon da'ira da aka buga, yana da takamaiman zurfin haɗi tsakanin layin saman da layin da ke ciki. Zurfin ramin yawanci baya wuce ƙayyadaddun rabo na buɗewar.

Ramin da aka binne: rami mai haɗi a cikin Layer na ciki na allon da'irar da ba ta wuce saman allon kewayawa.

Ta rami: wannan rami yana ratsa ta cikin dukkan allon kewayawa kuma ana iya amfani da shi don haɗin kai na ciki ko azaman rami mai hawa don abubuwan haɗin gwiwa. Domin ta hanyar rami a cikin tsari ya fi sauƙi don cimmawa, farashin yana da ƙasa, don haka ana amfani da allon da'ira gabaɗaya

Ta hanyar ƙirar rami a cikin PCB mai sauri

A cikin ƙirar PCB mai sauri, ramin VIA mai sauƙi sau da yawa zai haifar da mummunan sakamako ga ƙirar da'irar.Domin rage illar da tasirin parasitic na perforation ya haifar, zamu iya ƙoƙarinmu mafi kyau don:

(1) zaži m rami size.Don PCB zane tare da Multi-Layer general yawa, shi ne mafi alhẽri a zabi 0.25mm/0.51mm/0.91mm (hako rami/welding kushin/power ware yankin) ta hole.Ga wasu high- yawa PCB kuma iya amfani da 0.20mm / 0.46mm / 0.86mm ta rami, kuma iya gwada ba ta rami; Domin wutar lantarki ko ƙasa waya rami za a iya la'akari amfani da girma girma don rage impedance;

(2) girman yankin keɓewar WUTA, mafi kyau. Idan akai la'akari da yawan ramuka akan PCB, gabaɗaya shine D1=D2+0.41;

(3) yi ƙoƙarin kada ku canza Layer na siginar akan PCB, wato, gwada rage ramin;

(4) yin amfani da PCB na bakin ciki yana da amfani don rage matakan parasitic guda biyu ta cikin rami;

(5) fil ɗin wutar lantarki da ƙasa yakamata su kasance kusa da rami. Ƙananan gubar tsakanin rami da fil, mafi kyau, saboda za su haifar da haɓakar inductance. A lokaci guda, samar da wutar lantarki da gubar ƙasa ya kamata ya kasance mai kauri kamar yadda zai yiwu don rage rashin ƙarfi;

(6) sanya wasu ƙetare ƙasa kusa da ramukan wucewa na layin musayar sigina don samar da madauki na ɗan gajeren lokaci don siginar.

Bugu da kari, ta wurin tsayin rami kuma yana daya daga cikin manyan abubuwan da suka shafi ramin inductance.Domin ramin wucewa na sama da kasa, tsayin rami yana daidai da kauri na PCB. Saboda karuwar yawan yadudduka na PCB, kauri na PCB yakan kai fiye da 5 mm.

Koyaya, a cikin ƙirar PCB mai sauri, don rage matsalar da rami ya haifar, ana sarrafa tsayin ramin gabaɗaya a cikin 2.0mm. Domin tsayin rami ya fi 2.0mm, ana iya inganta ci gaban ramin ramuka zuwa wasu. Har ta hanyar haɓaka diamita na rami.Lokacin da tsayin ramin ya kasance 1.0mm kuma ƙasa, mafi kyawun buɗaɗɗen ramin rami shine 0.20mm ~ 0.30mm.