You essentially need logarithmic H & V ramps mixed and keyed to create a circle.
The third bank on Diver with its current original firmware creates logarithmic ramps. You can just key the H+V output.
Here’s a thread on how to do this with Cadet modules and several other useful bits of information on how to achieve it with other production modules:
I’m not certain if Vidiot’s H & V oscillators go slow enough to approximate a ramp. You should be able to create multiple simultaneous circles with the dedicated Circle output that follow the H & V oscillators.