I find this document very useful:
http://ltwiki.org/images/8/82/PWM_Filters.pdf
to better understand what means "filter a PWM" (for a beginner on this subject like me).

 

I find this document very useful:
http://ltwiki.org/images/8/82/PWM_Filters.pdf
to better understand what means "filter a PWM" (for a beginner on this subject like me).

Interesting use of LTSpice to generate illustrations for a scientific paper. That is what I have been doing on these forums for years...

 

I am glad to be in a very professional forum, and thank the partecipants in the discussion.
I will experiment with your proposals.