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Id=B/2(Vgs-Vt)²*(1-λVds)
Early voltage effects only on saturation current at MOSFET...
As you know Vds does not effect on Id in saturation, well in real MOSFETs it does, and it is represented with Early effect.
dependence of collector current on the collector emitter voltage.
that is the output resistance is finite.
so when the slope of ic vs vce is extrapolated it cuts at va- the early voltage.
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