U vysokoshvydkisnomu flex PCB nedostatno, shchob ziednannia pratsiuvalo lyshe na prototypi. Koly USB, MIPI, LVDS abo kamerni linii perekhodiat na hnuchku platu, tovshchyna dielektryka, hotova mid ta bezperervnyi opornyi shliakh bezposeredno vplyvaiut na zapas syhnalu.
Tomu impedans slid rozghliadaty razom iz materialamy flex PCB, bahatosharovym stackup ta realnym radiusom zghynu u zibranomu vyrobi.
Shvydki pravyla
- Rano zafiksuite tsil: 50 ohm single-ended abo 90/100 ohm differential.
- Rakhujte za hotovoiu middiu pislia pokryttia.
- Zberihayte bezperervnyi shliakh povernennia pid paroiu.
- Unikaite rizkykh neck-down bilya ZIF i rigid-flex perekhodiv.
- Vynosite krytychni kanaly z aktyvnoi zony zghynu, yakshcho mozhlivo.
| Struktura | Dlya choho krashche | Holovnyi ryzyk |
|---|---|---|
| Single-layer microstrip | Tonki dynamichni tail | Bilshyi EMI |
| 2-layer flex z ploshchynoiu | Typovi shvydki FPC | Bilsha tovshchyna |
| Adhesiveless konstruktsiia | Stabilnishyi impedans | Vyshcha vartist |
| Cross-hatched plane | Krashcha hnuchkist | Slabshyi shliakh povernennia |
| Rigid-flex | Shchilni moduli | Chutlyvyi perekhid |
"Tsilovyi impedans tse ne prosto chyslo z CAD. Tse vyrobnycha domovlenist."
— Hommer Zhao, Engineering Director at FlexiPCB
"Yakshcho u vas lyshe kilka omiv zapasu, ekonomiia na materiali chastо stae dorohym debugom."
— Hommer Zhao, Engineering Director at FlexiPCB
"Mezha rigid-to-flex chasto ye mistsem, de odnochasno zustrichaiutsia mekhanichni ta elektrychni ryzyky."
— Hommer Zhao, Engineering Director at FlexiPCB
FAQ
Chy krashchyi adhesiveless dlya kontroliu impedansu?
U bahatoh tochykh proektakh tak, bo znykaie odyn zminnyi dielektrychnyi shar i menshaie rozkyd.
Chy mozhe vysokoshvydkisnyi syhnal prokhodyty cherez zonu zghynu?
Tak, ale potribno pereviryty heometriiu pislia skladaannia, osoblyvo ponad 5 Gbps.
Chy dopomahaie tonsha mid?
Zazvychaino tak. 12-18 um lehше nalashtovuvaty, i vona takozh pokrashchuie resurs na zghyn.
Dlia perehliadu stackup zviazhitsia z namy abo zaprosit rozrakhunok.
