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How to plot frequency characteristic of capacitance?

kwsgk over 7 years ago

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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drdanmc over 7 years ago

my usual trick is to include a 1pF analogLib capacitor in my test bench and drive with a 1V AC source. Now I can find the imaginary part of the current in that cap and I have omega*1pF easily available. Then I don't have to remember xval() or enter pi.
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kwsgk over 7 years ago in reply to drdanmc

Thanks Dan.

Your trick works. That's a good idea!
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kwsgk over 7 years ago in reply to drdanmc

Thanks Dan.

Your trick works. That's a good idea!
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