[time-nuts] Impedance measurement fitting algorithm

[ehydra]

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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