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Transfer function

Discussion in 'Electronic Design' started by User Zero, Nov 23, 2009.

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  1. User Zero

    User Zero Guest

    Hi 2 all,

    is there any program to derive transfer function from circuit? Something
    like PSpice, but instead of numerical to do analytical "computation".
  2. oopere

    oopere Guest

    SSpice (symbolic SPICE) is what you are looking for.

  3. oopere

    oopere Guest

    I played with an evaluation copy of SSpice some 15 years ago...

    After a quick search I have found this link which brings up
    something that vaguely matches what I remember (not very user friendly
    though). But there are certainly few links on this in the internet!

    Another option, as someone already suggested, is to make use of the
    symbolic capabilities of Matlab (or Octave) and compute the relevant
    determinants from the (hand-written) system of equations. When I was a
    student I even coded a symbolic determinant function from scratch for
    exactly this purpose.

  4. User Zero

    User Zero Guest

    That's it, thanks!!!

  5. YD

    YD Guest

    Late at night, by candle light, Jim Thompson
    It does, and very nicely. Use it in the gain statement with dependent
    voltage or current sources. V=laplace(1/(s-1)) and so on.

    - YD.
  6. Fred Bartoli

    Fred Bartoli Guest

    Tim Wescott a écrit :
    Mathematica in itself also allows this very easily.
    But it has a very nice addon package (analoginsydes) that allows a lot
    more, like direct netlist input, symbolic TF evaluation... and
    simplification (your circuit matrix is numerically evaluated WRT your
    design point, then its symbolic form is returned while neglecting the
    terms up to some given accuracy, allowing deep insight of complex
    circuits), and much much more...
    All that coupled with the mathematica power makes this a very valuable
    analysis/design tool...
    But this comes at the price of a somewhat steep learning curve, plus a
    few grands... Worth it, imo
  7. JosephKK

    JosephKK Guest

    Bloody cool. With some scripts and some applied thinking you could
    make really nice filter optimization tools this way.
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