[volt-nuts] PWM voltage divider

[Randy Evans]

Considerations when using PWM circuits include Ron and Roff resistances,  rise and fall times of switches (differing times cause a bias offset) and charge injection effects (add offset), among others.  I am looking for circuit information for PWM dividers myself.  Does anyone have sources for the Fluke 5440 manual and the Datron 4910 manuals with schematics.  I looked on K04BB's site and Fluke's site  but all I could find were user manuals with no schematics.


Randy Evans




On Wednesday, January 8, 2014 10:17 PM, Andreas Jahn <Andreas_-_Jahn at t-online.de> wrote:
 
Another cirquit that was not mentioned  up to now is the EDN Cirquit

http://edn.com/design/other/4326640/DC-accurate-32-bit-DAC-achieves-32-bit-resolution

The advantage is relative low effort and fast settling time. (for a PWM 
solution)
Although you have to tweak the
 cirquit to get a fair linearity of around 
2-3 ppm.
(The values in the article seem to be very optimistic to me).
Also the noise behaviour of my setup is not as good as would be a dual 
dac version.

With best regards

Andreas


Am 08.01.2014 09:25, schrieb Jan Fredriksson:
> 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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