how do i create and use a stacked microvia? I have a design with a .65mm bga and need to change out the thru vias with a stacked microvia. this is not a question about if I need to do this, it is how do I do this. Thank you for your help.
Stacked? are you questioning about blind and burried via's?
If so..... you can use blind(micro) laser drill via on the BGA ball and dog bone it to burried via.
Via structure in this process is
Blind via layer 1 to 2
Burried via layer 2 to N-1
Blind via layer n to N-1