Tam,
I'm interested in working with you on most anything. I've always been impressed by your posts even when they are silly.
Do you have software to create an R-2R network with all the traces length matched from the Pico to the op amp? If you design an R-2R board for the Pico I'll order some sent to you along with a handful of Picos. My understanding is the JLCPCB "controlled impedance" option works well.
If not, I *can* write software to solve the problem but it's a bit tedious to type in all the equations and that's still not Gerbers, just lengths.
I think there would be considerable educational value in a video explaining that sample rate and frequency interact to generate harmonics. I've got a 33622A and 8560A sitting side by side.
I also have an 8 channel, 20 GHz sampling scope, a Tek 11801 w/ 3x SD-26 and an SD-24 so I can make sub-picosecond comparisons of traveltime along all the paths in the ladder with jumpers installed in place of resistors. And a 26 GHz 8566B SA to look for harmonics.
As the frequency of the fundamental goes up relative to the sample rate, the quantization noise rises. That would be easy to evaluate with a 23 bit R-2R board for the Pico. I *could* go in my library and look it up, but what's the fun in that?
By the time you add all the additional functionality, an F***Tech is still the cheapest option if it doesn't bork itself.
Have Fun!
Reg
