The differential amplifier in the figure below is fabricated in a 0.18-um CMOS technology for with unCox = 400 uA/V^2, |Vt| = 0.5 V, and |VA'| = 10 V/um. If the bias current I = 200 uA and all transistors have a channel length twice the minimum and are operating at |vov| = 0.2 V, find W/L for each of Q1, Q2, Q3, and Q4, and determine the differential voltage gain Ad. The differential amplifier of Fig. 9.12(a) is fabricated in a 0.18-um CMOS technology for which un Cox = 4upCox = 400 uA/V^2, |Vt| = 0.5 V, and |VA'| = 10 V/um.