i am reading the book 'CMOS analog circuit design'written by Allen.on the page 457 table8.22.why all the CMOS is in saturation when comparator's parameters are calculated.In my opinion the CMOS in second stage must be in triode rigion.
the second stage should be saturation. You cannot get full swing or rail to rail
in second stage. You need a buffer or double inverter to get a full swing
I think a comparator is a special OP-AMP,the linear rigion is very small, the output's middle point often made all MOS operate in suturate rigion, so you can use this characteris to calculate the comparing threshold voltage.