I know that if I use vias on high speed traces that I need to reduce the inductance effect of the via. So I will put ground vias next to these vias to help returning current. I have seen a picture about using ground vias that has confused me. Here is the first picture:
Everything seems OK on the left one, returning current turns from the reference layer ground. On the right image the vias between the two ground planes seems OK too.
But in this picture:
Which I desire to use for my design one layer is ground and one layer is the power plane. When I saw the picture, it uses two vias and a bypass between them. Do I have to use it like this, or any other advice?