Let see. Conductance is admittance's real part. So I think there is the difference but the admittance (which in the parametter's table is the module) must be bigger than conductance and I do not know why it's not.
In the ac model which one I must use as rd?
So I think there is the difference but the admittance (which in the parameter's table is the module) must be bigger than conductance and I do not know why it's not.
Yes, it's just a simple model which I found in internet. I'm using all capacitance in it. The input capacitance which it's between gate and source, outpu capacitance which it's between drain and source and the reverse transfer capacitance which it's between gate and drain.
A realistic RF model will probably have bulk resistance elements in series with Cds and Cdg, resulting in an increasing real admittance component with rising frequency.
The input capacitance which it's between gate and source, outpu capacitance which it's between drain and source and the reverse transfer capacitance which it's between gate and drain.