Yintoni i-PCB Back Drilling?
Inkqubo yokugrumba umva kwe-PCB, ekwabizwa ngokuba kukugrumba ubunzulu obulawulwayo, ibandakanya ukususa i-stub kwi-PCBs ezinee-multilayer ukwenza ii-vias. Injongo yokugrumba umva kukwenza kube lula ukuhamba kwemiqondiso phakathi kwee-layers ezahlukeneyo zebhodi ngaphandle kokuphazamiseka kwee-stubs ezingafunekiyo.
Ukuze sinike ingcaciso ecacileyo yenkqubo yokubhoboza ngasemva, makhe siqwalasele umzekelo.
Masithi kukho i-PCB enezintlu ezili-12 enemingxuma edibanisa izintlu zokuqala neze-12. Injongo kukudibanisa kuphela umaleko wokuqala kumaleko we-9, ngelixa kugcinwa izintlu ezili-10 ukuya kwele-12 zingadibani. Nangona kunjalo, izintlu ezingadibaniyo zenza "izintlu" ezinokuphazamisa indlela yesignali, nto leyo ebangela iingxaki zokuthembeka kwesignali. Ukubhola ngasemva kubandakanya ukubhola ezi zintlu ukusuka kwicala elingasemva lebhodi ukuphucula ukuhanjiswa kwesignali.
Yintoni injongo yokugrumba umva kwePCB?
Ukubhola nge-PCB back drilling kusetyenziselwa ukususa inxalenye engasetyenziswanga yomngxuma ogqunywe nge-plated (ngokusebenzisa) odlula ngaphaya komaleko wokugqibela we-PCB. Le nkqubo inceda ekunciphiseni imiba yokuthembeka kwesignali, efana nokuqaqamba kwe-stub kunye nokubonakaliswa kwesignali, okunokwenzeka kuyilo lwedijithali olukhawulezayo.
Yintoni "umlinganiselo womda"?
Imibuzo ebuzwa rhoqo malunga neebhodi zesekethe eziprintiweyo › AMAGAMA
Ubudlelwane phakathi kobubanzi bomngxuma kunye nobude bawo. Xa umenzi esithi imveliso yakhe ine-"aspect ratio" ye-8:1, oko kuthetha ukuba, umzekelo, ububanzi bomngxuma yi-0.20 mm kwi-PCB enobukhulu obuyi-1.60 mm.
Kwizakhiwo ze-HDI, umlinganiselo we-aspect ratio ye-microvia ulinganiselwe kwi-1:1, kodwa i-0.7-0.8:1 ingcono kune-plating elula.
Zithini iingenelo zokubhola umva nge-PCB?
Iingenelo zokubhola umva nge-PCB ziquka ukuphuculwa kokuthembeka kwesignali, ukunciphisa ilahleko yokufakwa, ulawulo oluphuculweyo lwe-crosstalk, kunye nokwanda kwe-bandwidth. Ngokususa inxalenye engasetyenziswanga ye-via barrel, ukubhola umva kunciphisa i-stub resonance kunye nokubonakaliswa kwesignali, okubangela ukuhanjiswa kwesignali okucocekileyo nokuchanekileyo.