[time-nuts] Impedance measurement fitting algorithm

Brooke Clarke brooke at pacific.net
Wed May 23 18:37:50 UTC 2012


Hi Henry:

You might just try using a spreadsheet to calculate the complex impedance of your model circuit and manually play with 
the parameter values and get them to match the measured data.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html


ehydra wrote:
> Hi time-nuts!
>
> If I remember correctly here was a discussion about an older HP impedance measurement equipment. The one which is able 
> to calculate a 6 ideal parts replacement circuit for the measured passive device.
>
> How does is it works? I would like to fit parts for simulation in SPICE. So I need something like a algorithm to fit 
> for minimum error a input table with complex numbers (frequency-sweep) to this 6 part circuit. For example the 
> universal capacitor component in LTspice is able to hold RLC and even XTAL data and more like residual current for 
> electrolytics.
>
> Any ideas?
>
> Thanks -
> Henry
>




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