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How to plot frequency characteristic of capacitance?

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Hi. all. I'd like to plot frequency characteristic of capacitance in spectre. In AC simulation, I get current of capacitor (Ic) and its imaginary part ( Im(Ic) ). Now tring to calculate Cap = Im(Ic) / omega (omega=2*pi*freq) I can't find how to devide Im(Ic) by freq or omega. I find 'xval' can plot simulation frequency, but dividing doesn't work. Could you help, please? Best Regards Kawai

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