#5. In the op-amp below, (W/L)1−8 = 80 /0.5, VDD = 2.5 V and Iss = 1 mA. Use same parameters as in problem #1. a) What common-mode (CM) level must be established at the drains of M3 and M4 so that ID5 = ID6 = 1 mA? How does this constrain the maximum input CM level? b) With the choice made in part a), calculate the overall voltage gain and the maximum and minimum output voltages.