Working on this exercise:
I understand that if all the transistors in a cascode have the same current and the same Vgs then they will have the same Vov. However in this case the Vgs do not seem to be the same and so I'm wondering how all Q's have the same Vov. Additionally, if all Q's have a Vov of 0.2 V then shouldn't the possible range of output voltages be this?:
*Side note, when I initially tried the question I used Vds=Vov and worked from the top and bottom to get Vovs of Q1 = Q4 = 0.2 V and Q2 = Q3 = 0.3 V, which give the output voltage range given in the answers of the book.