[volt-nuts] PWM voltage divider

Ulrich Bangert df6jb at ulrich-bangert.de
Wed Jan 8 04:38:09 EST 2014


with standard PWM generated from a microcontroller the repetition rates of
the signal may get VERY slow with higher resolutions, making it difficult to
make a pure DC signal from. You should consider to use a Sigma-Delta DAC
which is very easy to program in a microcontroller. I have used AVR Megas
with software Sigma Delta DACs and precision analogue multiplexers to switch
between the reference and GND up to 20 bits of resolution. Worked fine!

Best regards

> -----Ursprungliche Nachricht-----
> Von: volt-nuts-bounces at febo.com 
> [mailto:volt-nuts-bounces at febo.com] Im Auftrag von Jan Fredriksson
> Gesendet: Mittwoch, 8. Januar 2014 09:25
> An: volt-nuts at febo.com
> Betreff: [volt-nuts] PWM voltage divider
> I'm thinking of using a PWM divider for voltage generation of 
> adjustable DC voltages from a voltage reference.
> Does anyone have any pointers to circuits, solutions, 
> topologies, error analysis etc. for such solutions?
> Jan
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