Imaginary of input impedance

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half1st

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Zin = Rs + Ri + Rg + 1/(Wp*Cgs)

From the equation, i need to generate the Im{Zin} but i don't know how.. I only got Zin=23.61Ohm..What is make the equation will get Re{Zin} + IM{Zin}?
Cgs=0.351pF..How to generate the imaginary part from the capacitance?
 

What is Wp?

You should get the imaginary part from Cgs. How come frequency is missing in your equation?
 

I beleive wp is 2piF,
correct?

Xc=-J/(WC)
 

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