[sdiy] Idea - Triangle wave DCO core

[Tom Wiltshire]

It occurred to me today that you could fairly easily build a triangle core DCO. This wouldn't use a reset pulse, but would instead use a bipolar DAC.

You'd simply output a charging CV from a DAC to an integrator. After half a cycle has been timed by the uP, it switches the DAC charging CV to the opposite polarity. And so on. Instant triangle wave at known frequency.

Has anyone ever done/seen anything like this?

Presumably once you'd got the basic version working, you could tweak the rise/fall CV calculation to get variable waveforms between ramp(ish) and triangle. Aside from that, I can't see any massive advantages beyond simplicity.

What do you think?

T.