Guys My doubt is that for the following cascode configuration how can the minimum voltage needed at the drain of M1 be Vt + 2 Vov for M1 and M2 to be in saturation ?? Vov is the over drive voltage whihc is Vgs- Vt.
For saturation considering that Vds > Vov. At transistor M1 the minimum voltage should be 2Vt + 2Vov in my opinion. But it is said that it is Vt + 2 Vov , how is this so ??