Yintoni PCB Back Drilling?
Inkqubo ye-PCB yokugrumba ngasemva, ekwabizwa ngokuba kukugrumba ubunzulu obulawulwayo, kubandakanya ukususa i-stub kwi-PCBs zamalayile amaninzi ukwenza i-vias. Injongo yokugaya ngasemva kukuququzelela ukuhamba kwemiqondiso phakathi kweengqimba ezahlukeneyo zebhodi ngaphandle kokuphazamiseka kwi-stubs engafunekiyo.
Ukubonelela ngengcaciso ecacileyo yenkqubo yokugaya ngasemva, makhe siqwalasele umzekelo.
Masithi kukho i-12-layer PCB kunye nomngxuma wokutyhutyha odibanisa imigangatho yokuqala neye-12. Injongo kukudibanisa kuphela umaleko wokuqala kwinqanaba le-9, ngelixa ugcina i-10 ukuya kwi-12th layers ingaxhunywanga. Nangona kunjalo, iileyile ezingaxhunywanga zenza "i-stubs" ezinokuphazamisa indlela yesignali, okubangela iingxaki zengqibelelo yomqondiso. Ukugrumba ngasemva kubandakanya ukugrumba ezi stubs ukusuka kwicala elingasemva lebhodi ukuphucula ukuhanjiswa komqondiso.
Yintoni injongo PCB umqolo ukomba?
PCB umqolo ukombiwa isetyenziselwa ukususa inxalenye engasetyenziswanga acandwe ngomngxuma ngokusebenzisa-umngxuma (nge) ukuba idlulele ngaphaya umaleko wokugqibela PCB. Le nkqubo inceda ekunciphiseni imiba yemfezeko yomqondiso, efana ne-stub resonance kunye nokubonakaliswa kwesignali, enokuthi yenzeke kuyilo olukhawulezayo lwedijithali.
Yintoni "i-aspect ratio"?
FAQ malunga neebhodi zesekethe eziprintiweyo › TERMINOLOGY
Ubudlelwane phakathi kobubanzi bomngxuma kunye nobude bayo. Xa umenzi echaza ukuba imveliso yabo ine "aspect ratio" ye-8: 1 ithetha, umzekelo, ukuba ububanzi bomngxuma yi-0.20 mm kwi-PCB eyi-1.60 mm.
Kwizakhiwo ze-HDI, i-aspect ratio ye-microvia inqunyelwe kwi-1: 1, kodwa i-0.7-0.8: i-1 ikhethwa ukuba ilula i-plating.
Zeziphi iingenelo PCB umqolo ukomba?
Izibonelelo zePCB ukubuyisela ukuqhubela phambili zibandakanya ukuphuculwa kwemfezeko yesignali, ukunciphisa ilahleko yokufaka, ukuphuculwa kokulawulwa kwe-crosstalk, kunye nokwanda kwe-bandwidth. Ngokususa isahlulo esingasetyenziswanga sombhobho, ukugrumba ngasemva kunciphisa i-stub resonance kunye nokubonakaliswa kwesignali, okukhokelela ekucoceni kunye nokuhanjiswa kwesignali echanekileyo ngakumbi.