where L,W refers to the length and width of the channel, Cox denotes oxide capacitance per unit area, Ids/Vds is the bias voltage and refers to the differential conductance.
L/W=0.5
Cox=3.98.8510^(-12)=3.4515e-11
Vds=15
Ids/Vds=3.33*10^-7
结果：321.9180