8.81 In this problem, we will explore the difference between using a BJT as cascode device and a MOSFET as cascade device. Refer to Fig. P8.81. Given the following data, alculate Gm, Ro, and Avo for the circuits (a) and (b): I = 100 μA, β = 125, μnCox = 400 μA/V2, W/L = 25, VA = 1.8 V
