two nmos

hi

i need to calculate the Vgs and Vds and the current of the whole two transistor in three situations:

1. cutoff

2. saturation

3. linear

i found that the lower transistor is always in saturation...and i also found that for cutoff : Vgs < 2Vt

and therefore for saturation and linear must be Vgs> 2Vt

however i didnt find any condition on Vds and i didnt know how to find the current

thanks




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