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Why is pi model so simple? Is ASITIC really modeling the structure correctly?

April 26, 2017asitic correctly model modeling Pi simple structure

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Why is pi model so simple? Is ASITIC really modeling the structure correctly?

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The pi parameters do not really model the spiral but in fact represent the 2-port parameters of the structure at a particular frequency. The pi parameters are simply a one-to-one translation of the 2-port parameters into a circuit representation. If you like, this is a narrow-band or single frequency model of the structure. You will notice that the pi parameters vary as a function of frequency. You can construct a frequency-independent model of the spiral by optimization, or by fitting the model parameters to the 2-port parameters of the structure. Use the 2portx command to calculate the 2-port parameters of a structure over a frequency range. See the next question for more details.