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nmos pmos ro is too low fow the result

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yefj

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Hello,I have build a common source with 28.5dB gain which is 25.11 linear gain in LTSPICE.

From gm/id value:
Id = 50 μA gm/id = 12.6 => gm = 12.6×50×10-6 = 630×10-6
Id vg Vds in the Vgs conditions is shown below.
g_ds = d_Id/d_Vds plot is shown in the end.

For Vds = 0.9 I get rds_nmos = 1.9×10-5. These results are for NMOS. A = gm×R=(1.9×10-5)×(630×10-6) which is far away from 25.11. In the end i have added pmos d_I/d_Vds i get there g_ds=0.0001
from equation shown in the end i get 1/gds_n=52085 1/gds_p=4887 still A=gm*Rt=4.41 far away from 25
Where did I go wrong recreating the simulation result?
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