After skimming through some data sheets I noticed the initial voltage buffer wasn't very useful as-is. The MAX44252 only has 2pF input capacitance so to balance out the loading of the DUT's capacitance I added C2 to compensate. For now it's a placeholder until I run more calculations to see what the feasible range of capacitances the DUT will have.

I've also replaced the discrete comparator for phase measurement with an internal one on the STM32L100RBT6. Originally I wanted to keep the phase output separate so I could easily hook up other microcontrollers and evaluate them as an alternative to the STM32.

The power rail for U1 isn't finalized since I'm determining to what extent I should protect the SSMU from the DUT area. The idea is to teach someone filters and such using this project but if they build something with too high a Q factor it could release some magic smoke on the board.