Platform forum

High speed rules for ground vias

angelsix , 10-22-2015, 11:29 AM
I know I should keep 20mil distance from other signals on 100ohm diff pairs for example, but what about ground vias?

I've got quite a few places where I could really do with placing a ground via, but its 13mil from a PCIe signal. Do the same rules apply or doesnt it matter those signals being close to a via?

I'm guessing the only thing a ground via would do is act as a void so the void rule would apply, however I cannot find any documents that state the distance to leave between the trace and a void.
robertferanec , 10-23-2015, 12:39 AM
VIAs are normally fine - you can route close to them. However I do not normally route closer than 0.1mm / 4 mils (Track <-> VIA). Of course, the opening around VIA can not be very large - there still should be ground plane under the tracks.
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?