There has long been a debate going on in the SI community on the need (or not) for ground vias or “stitching vias” near signal vias for high-speed signals. These days you can follow a very interesting and well-behaved debate on the SI-LIST email reflector about just this issue: http://www.freelists.org/post/si-list/AW-Ground-vias-around-signal-via,21 Reading between the lines and… Read more