Hi, I am designing custom AD-FMCOMMS4-EBZ board. There are many differantial pair in layer 5 and layer 6. Layer 5 dont have ground in differantial pairs namely it is not coplanar. you can see attached pic. But differantial pairs in layer 6 has ground that is it is coplanar. what is the reason of doing this type of grounding.
Moved to the AD9364 forum. Please post transceiver questions in the approprate transceiver forum.
Please check the .brd file. Both Layer 5 and 6 following the similar differential pair routing.