Re: PCB grounding
Hi,
if you have 2 or moore gnd planes, but they are the same gnd, no problem to connect the planes with vias trough hole. Not convenient use blind via.
The problem was different you have 2 gnd planes but different gnd, for example digital gnd, and analog. If possible keep this planes Not overlapped and connect te planes in only one point, Bouli and shawndaking are right.
If the circuit are high speed, the situation are moore complex, but is possible to connect the planes (only if are same gnd), with a vias matrix.
In the RF circuit, are not so simple, do you need to control impedance, is not possbile to connect planes with a rule of thumb.
Skywalker.