Gịnị bụ PCB Back Drilling?
Usoro nke PCB na-egwu azụ, nke a na-akpọkwa ya ngwo omimi a na-achịkwa, gụnyere iwepụ stub ahụ na PCB dị iche iche iji mepụta vias. Ebumnuche nke ngwo azụ bụ ime ka mgbasa nke akara dị n'etiti akwa dị iche iche nke bọọdụ ahụ dị mfe na-enweghị nnyonye anya site na stub ndị a na-achọghị.
Iji nye nkọwa doro anya gbasara usoro igwu azụ, ka anyị tụlee otu ihe atụ.
Ka e were ya na e nwere PCB nke nwere oyi akwa iri na abụọ nwere oghere gafere nke jikọtara oyi akwa mbụ na nke iri na abụọ. Ebumnuche ya bụ ijikọ naanị oyi akwa mbụ na oyi akwa nke itoolu, ebe a na-edebe oyi akwa nke iri ruo nke iri na abụọ na-enweghị njikọ. Agbanyeghị, oyi akwa ndị na-enweghị njikọ na-emepụta "stubs" nke nwere ike igbochi ụzọ mgbaàmà, na-ebute nsogbu iguzosi ike n'ezi ihe mgbaàmà. Ịkpọpụta azụ gụnyere igwupụta stubs ndị a site n'akụkụ azụ nke bọọdụ ahụ iji melite nnyefe mgbaàmà.
Gịnị bụ ebumnuche nke igwu azụ PCB?
A na-eji PCB gwuo azụ iji wepụ akụkụ a na-ejighị eme ihe nke oghere gafere (via) nke gafere oyi akwa ikpeazụ nke PCB. Usoro a na-enyere aka belata nsogbu iguzosi ike n'ezi ihe nke akara, dị ka stub resonance na signal reflections, nke nwere ike ime na imewe dijitalụ dị elu.
Kedu ihe bụ "nhazi akụkụ"?
Ajụjụ Ndị A Na-ajụkarị Banyere Mbadamba Sekit Ebipụtara › NTỤZI AKA
Mmekọrịta dị n'etiti dayameta nke oghere ahụ na ogologo ya. Mgbe onye nrụpụta kwuru na mmepụta ha nwere "oke akụkụ" nke 8:1, ọ pụtara, dịka ọmụmaatụ, na dayameta oghere ahụ bụ 0.20 mm na PCB dị arọ 1.60 mm.
Maka nhazi HDI, oke akụkụ maka microvia dị naanị na 1:1, mana 0.7-0.8:1 ka mma karịa ime ka mkpuchi ahụ dị mfe.
Kedu uru dị na igwu ala azụ PCB?
Uru nke PCB na-egwu azụ gụnyere imeziwanye iguzosi ike n'ezi ihe mgbaàmà, mbelata mfu ntinye, njikwa crosstalk ka mma, na mmụba bandwidth. Site na iwepụ akụkụ a na-ejighị eme ihe nke via barrel, igwu azụ na-ebelata resonance stub na reflections mgbaàmà, na-eme ka nnyefe mgbaàmà dị ọcha ma zie ezi karịa.