Platform forum

Determine the number of pcb layer

khiworld , 08-01-2019, 02:02 AM

I just read the article which is "3 Steps How to determine/calculate the number of pcb layers."
I woudl like to know the reason why 2 layer PCBs for interfaces with controlled impedance (USB) is not recommended.

robertferanec , 08-02-2019, 02:23 AM
There are at least two big main reasons why controlled impedance tracks are hard to do on 2 layer PCB:
- it is very hard to have a solid GND plane on 2 layer PCB
- GND plane is far away from the signal layer (this for example means, that it is very hard to find dimensions such track width and gap which could be realistically used on the PCB .. usually to meet required impedance, the dimensions would be huge)
Use our interactive Discord forum to reply or ask new questions.
Discord invite
Discord forum link (after invitation)

Didn't find what you were looking for?