1. The problem statement, all variables and given/known data 2. Relevant equations Adiff(single-ended)= 1/2gm*ro||Rd β=R2/(R1+R2) 3. The attempt at a solution I am really confused as to how to find A. I know the feedback of the circuits around the R2 and R1, but I dont understand how the open loop gain can be found. Can someone assist me in deriving it? First question is what gain are they asking for: common mode or differential? I assume differential, but I am honestly lost.