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[Modelling] Good capacitor model?

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Adun

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hi i am trying to find a better Metal-Insulator-Metal capacitor model.
This is what I have right now:

C=Er*E0*(a+f)*(b+f)/h

where a, b are the width and length of the two rectangular plates;
h is this distance between the two plates, (or thickness of the insulator)
and f represents effective length due to the fringing field
f=4*ln2*h/pi

the capacitance value given by the above equation is quite different from HFSS's result.

i tried IEEE explore with keyword "capacitor model" and did not find anything useful.

Thank!!
 

jian

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Adun:

The parallel-plate approx for C is very accurate for the C(1,2) of a MIM cap. You should check your model if any simulator does not match it closely. Regards.
 

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