R2R Ladder – Part 2

I have built the R2R ladder DAC, that I had previously built on breadboard, on a piece of copper clad board. This has fixed something that I forgot to mention in the last post; which was that at the lower end of the sawtooth ramp there was a high frequency oscillation. This was probably because of the poor grounding I had when testing. In the right-hand corner of the board I built a op-amp buffer stage.

photo of the prototype R2R ladder DAC

Below is a screenshot from my Oscilloscope of the DAC in operation. As you can see it works!

oscilloscope screenshot showing the sawtooth wave generated by the R2R ladder DAC