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Digital PSU LTSpice simulation model ...
Digital PSU LTSpice simulation model ...
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Old 12th January 2018, 07:48 AM   #1
gentlevoice is offline gentlevoice  Denmark
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Join Date: Oct 2007
Location: Denmark
Digital PSU LTSpice simulation model ...
Default Digital PSU LTSpice simulation model ...

Hi all,

I have for some time now been underways with an LTSpice model that reliably simulates how the PSU inputs to e.g. a DAC behaves with respect to the PSU components surrounding it.

The purpose of this has been - is - to get a quite good idea about which components (capacitors & resistors) may give the best decoupling of digital PSU noise at various frequencies.

I have attached the model I am working with to this post including an example of what the AC analysis looks like (for these values).

The thing is that I am just not quite sure it is entirely correct ... ? E.g.: is the IC current draw best modeled as a current source switching, or as a voltage source changing its voltage ... ?

Have anyone else been modeling this? And maybe have a model they find work well?

Cheers,

Jesper
Attached Images
File Type: jpg PSU_sim_diyaudio.jpg (347.7 KB, 21 views)
File Type: jpg PSU_sim_diyaudio_AC.jpg (394.6 KB, 24 views)
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