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Hello all!  I am trying to do NMOS characterization. When I change W/L I get a change in Kn'. Kn' should be a constant but I am getting different values for different W/L.

I am following the equation Id = Kn' * 0.5 * W/L * (Vgs-Vt) ^2

Unfortunately this is a theoretical model. In practice you will have short-width and short-length effects and so both Vt and Kn' will change with W and L.

Okay but then what formula should I follow?

To get accurate results for varying L/W you'll need to simulate it in ngspice.

I have tried simulating the design in xschem with W/L - 0.42/0.15,  7/8, 0.42/1.

What is Linen?