I am trying to estimate the equivalent series resistance, quality factor and capacitance for a MIM capacitor in 90nm process technology using S-parameter analysis in Cadence IC5141.

After running the analysis, I am using the Y-parameters to plot the G, C & Q using the following equations:

1. G =  real(Y11 - ((Y12*Y21)/Y22))
2. C = -imag(Y11 - ((Y12*Y21)/Y22))/(2*pi*f)
3. Q= -imag(Y11 - ((Y12*Y21)/Y22))/real(Y11 - ((Y12*Y21)/Y22))

The plot for these equations is attached. These plots are not making any sense. Does anyone have any clue about what am I doing wrong?
Also when I use a similar test-bench for an inductor, these equations works properly

Thanks.

Thank you for your quick response. Yes there was wrong model file.