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Obtain transfer function from QUCS?

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TGV
2013-08-08
2013-08-08
  • TGV
    TGV
    2013-08-08

    Hi. I'm quite taken with QUCS. My knowledge of (analog) electronics was quite rusty, and it helped me understand some circuit, but now I'm wondering if it's possible to obtain the transfer function (or something similar) that QUCS probably computes when creating a frequency response plot. I have been drawing them up by hand, but by now the number of components has become so large that it's likely that I'm creating errors in doing so.

    Thanks for this great program,

    Theo

     
    • Frans
      Frans
      2013-08-08

      Dear theo,

      Qucs does not calculate the transfer function but it does output all data
      points. If you export the dataset to octave you can do a least square fit
      if you know the order of the function.
      The octave script can be included in the project and executed after
      simulation.

      Frans
      Op 8 aug. 2013 11:06 schreef "TGV" flwrd@users.sf.net het volgende:

      Hi. I'm quite taken with QUCS. My knowledge of (analog) electronics was
      quite rusty, and it helped me understand some circuit, but now I'm
      wondering if it's possible to obtain the transfer function (or something
      similar) that QUCS probably computes when creating a frequency response
      plot. I have been drawing them up by hand, but by now the number of
      components has become so large that it's likely that I'm creating errors in
      doing so.

      Thanks for this great program,

      Theo

      Obtain transfer function from QUCS?https://sourceforge.net/p/qucs/discussion/311050/thread/d16aecf0/?limit=25#cf83

      Sent from sourceforge.net because you indicated interest in
      https://sourceforge.net/p/qucs/discussion/311050/

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      • Richard C
        Richard C
        2013-08-08

        Bear in mind also that you can't really get a transfer function for a
        nonlinear system, so if you have any nonlinear circuit components there
        probably isn't a transfer function anyway. At the very least it will
        probably depend on the specific circuit.

        Frans' fitting approach might be just as good in this case.

        Richard

         
  • TGV
    TGV
    2013-08-08

    Ok, I understand. Thanks!