1 GND Vias beside high-speed signal via.Originally posted in cdnusers.org by tfsummer
If there are more than one gnd layer, the GND via can should be used to provide a continuous signal returning current path, right? But if there is only one gnd layer, are the gnd vias still usefull?If useless, should the gnd vias be removed?
2 how to understand signal returning current on a Plane underneath that is not a GND layer?
ex: a VCC plane layer stacked closely under a signal layer, how to understand the returning current on VCC layer?