I have an FMC Card with analog circuitry containing channels. I've separated the ground for these analog channels into two distinct planes: AGND and PGND.
PGND serves as the ground for the power supplies required to operate the operational amplifiers in the analog channels. Now, I need to route the LVDS outputs of these op-amps to the nearby FMC connector, which is closely tied to PGND.
The LVDS pairs, operating at 500MHz, will need to traverse across both ground planes, AGND and PGND. I'm concerned about potential issues because I've come across literature cautioning against routing single-ended signals over split planes. However, in my case, it's a differential pair, and the return path is nearby. The ground planes are at the same potential but separated by a bead to prevent the return current from entering the analog chain.
Please let me know if you see any problems with my approach.