Given that in VerilogA it's quite straightforward to write equations for a conservative system, it must just be that you've not captured the equation correctly. You can write an equation that relates the current through a branch to the voltage across it or vice versa - so it's easy to describe a capacitor, an inductor, or a resistor or some complex relationship which has elements of all of them in some non-linear way. Unless we are able to know how the actual measured data was made, and how it behaves, I doubt anyone can give you a suggestion as to what you should be doing - we're in the dark here! Regards, Andrew.
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