Re: gEDA-user: Tool to calculate Nyquist-plot or impedance?

["KURT PETERS" <peterskurt-atMUNGEDmsn_dot_com>]

Try KJWaves (on sourceforge).  The graphing routine allows you to select the 
Real or Imaginary part of any signal to place on any axis of a graph.  It 
should do what you want.  You just have to get your sim. ready to run on 
ngspice.
Kurt


Wen wrote:
 > Hi list,
 > I am going to do Equivalent circuit fitting for a university project with 
impedance spectroscopy.
 >
 > I am looking for a tool that first allows  to define (via a graphic 
interface would be best) an electric circuit made of resistors, conductors, 
inductors and maybe constant phase and warburg elements.
 > What i need is a Nyquist-plot of that circuit-> a plot that shows the 
imaginary (vert. axis) and the real (horiz. axis) part of the impedance of 
the defined circuit for a wide range of frequencies.
 >
 > So I am either looking for an application that outputs that Nyquist-plot 
directly or that calculates the impedance analytically with the frequency as 
a parameter, so that I can use it for a matlab/octave-script.
 >
 > Is there a geda-tool thats able to do one of those two things? I did not 
see something like that in the tutorial-part nor find it in the 
gschem-interface?
 > If not, does somebody know other applications that are able to handle 
this?
 >
 > Thanks in advance,
 > Wen

gnucap.

gnucap is a circuit simulator and it is very easy to describe your
circuit  and do an ac analysis of it to directly measure the impedance.
   You can take that data and feed it back to matlab or octave.


-Dan




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