I am designing a four layer PCB, (signal, ground, pwr, signal), which is to generate +-1V max 30kHz frequency signals which is output on a differential pair. It is pretty simple board layout but I am little confused about whether I should use a split ground or even slit the board. My board layout can be seen below.
There seems to be alot of debate over the benefits or possible problems of what a split ground might do. My plan for the board is to have the left half dedicated to the output signals, powered by two regulators +3.3V and -3.3V. I have a 2MHz clock that generates the clock for frequency generating chips, AD9106 x2. I am worried about this potentially contaminating the analog signals. Additionally I have placed ferrite beads (MPZ1608B471A) on the output of each of the regulators to stop this, I have employed good decoupling capacitors where required.
Any hints or tips on what grounding scheme may be best would be appreciated.