Voi flex PCB toc do cao, chi viec lien ket chay duoc tren mau thu la chua du. Khi USB, MIPI, LVDS hoac duong camera chuyen sang mach mem, do day dien moi, do day dong sau gia cong va duong tham chieu hoan tra anh huong truc tiep den bien do du phong cua tin hieu.
Vi vay, tro khang phai duoc xem cung vat lieu flex PCB, stackup da lop va ban kinh uon thuc te trong san pham da lap rap.
Quy tac nhanh
- Chot muc tieu som: 50 ohm single-ended hoac 90/100 ohm differential.
- Tinh toan theo dong hoan thien sau plating.
- Giu duong return lien tuc ben duoi cap doi.
- Tranh neck-down qua gat tai ZIF va vung chuyen rigid-flex.
- Dua kenh quan trong ra xa dinh uon hoat dong neu co the.
| Cau truc | Phu hop cho | Rui ro chinh |
|---|---|---|
| Single-layer microstrip | Tail mong va dong | EMI cao hon |
| Flex 2 lop co plane | Ket noi FPC toc do cao pho bien | Day hon |
| Cau truc adhesiveless | Tro khang on dinh hon | Chi phi cao hon |
| Plane cross-hatched | Linh hoat tot hon | Return path yeu hon |
| Rigid-flex | Module mat do cao | Bien chuyen nhay cam |
"Tro khang muc tieu khong chi la con so trong CAD. Do la thoa thuan voi san xuat."
— Hommer Zhao, Engineering Director at FlexiPCB
"Neu bien do du phong chi con vai ohm, tiet kiem vat lieu thuong bien thanh chi phi debug lon hon."
— Hommer Zhao, Engineering Director at FlexiPCB
"Ranh gioi rigid-to-flex thuong la noi rui ro co khi va dien giao nhau."
— Hommer Zhao, Engineering Director at FlexiPCB
FAQ
Adhesiveless co tot hon cho kiem soat tro khang khong?
Trong nhieu thiet ke chinh xac, co. Vi no loai bo mot lop dien moi bien dong va lam hep cua so sai so.
Tin hieu high-speed co the di qua vung uon khong?
Co, nhung can xac minh hinh hoc sau lap rap, dac biet tren 5 Gbps.
Dong mong hon co giup khong?
Thuong la co. 12-18 um de can chinh hon va cung cai thien tuoi tho uon.
Neu can review stackup, lien he chung toi hoac yeu cau bao gia.
