Hi all,
As far i know, balanced pcb stackup follows
1. signal layer should have adjacent power/ground layers
2. from center of the board(cross-sectional) top and bottom should have same amount or weight of copper and the di-electrics.
If i am deviated from the correct concept please guide me
***In my case, we are going for the 2 different material di-electric material
if i am placed top 4 layer have the same dielectric material and other layers have different material (totally 30 layers board). whether this affects my balanced stackup**
Please help me on this...