This is an add-on board for the Squareatron 5000 v1.1 ultra low-noise ion trap RF supply.
It works by trimming the precision 3.3V supply voltage of the limiting amplifier on the Squareatron 5000. It provides a tuning range of 3.15-3.45 V without adding significant noise. The Jupyter notebook included provides a noise model.
A prototype board currently being fabricated and testing will follow.
Design files (schematics, PCB layouts, BOMs) can be found at Squareatron_DAC_Board/releases.