Harald Pretl made a fascinating submission to Tiny Tapeout 3, an analog circuit made from digital standard cells.

It builds a DAC out of a lot of tristate inverters, and a big capacitor by ganging up a lot of NAND gates.

In this interview with Harald we discuss how it works and how he made it and simulated it.

You can check his design here, including the source and GDS.

• interviews