saturation condition for pmos
you can understand this by two ways:-
1> write down these eqas. for nmos then use mod for all expressions and put the values with signs i.e.+ or - for pmos like Vt for nmos is + but for pmos its negative.
so by doin this u will get the right expression.
2> second way to understand is just write down the equs. for nmos and reverse the sign of > and <. then put the different values of pmos with the signs i.e. Vt shd be negative etc.
so by this way u can also understand these equs for pmos.