[sdiy] Driving SSI2144 freq control with PWM from a microcontroller

[René Schmitz]

On 06.11.2022 01:03, Ben Gebhardt via Synth-diy wrote:
> Interesting discussion!
>
> I ran across this EDN article and want to try it out when I get a 
> chance.  Seems like a good compromise between and RC and full blown 
> active filter.  Has anyone done this before for synths?  I wonder if 
> it’s practical for this application.
>
> https://www.edn.com/cancel-pwm-dac-ripple-with-analog-subtraction/


There is a video about this from Prof. Sam Ben-Yaakov: 
https://www.youtube.com/watch?v=eJNuHtzOKzY

TL;DW: It turns out it's not adding a real advantage when compared to a 
passive 2-pole filter. Which doesn't need the inverter, and uses the 
same number of passives.

BTW, check out that channel if you're interested in power electronics, 
SMPS and the like.


Cheers,

  René


--
synth at schmitzbits.de
http://schmitzbits.de