*7.121 The MOSFET in the circuit of Fig. P7.121 has Vt = 0.8 V, kn = 5 mA/V2, and VA = 40 V. (a) Find the values of RS, RD, and RG so that ID = 0.4 mA, the largest possible value for RD is used while a maximum signal swing at the drain of ±0.8 V is possible, and the input resistance at the gate is 10 M. Neglect the Early effect. (b) Find the values of gm and ro at the bias point. (c) If terminal Z is grounded, terminal X is connected to a signal source having a resistance of 1 M, and terminal Y is connected to a load resistance of 10 k, find the voltage gain from signal source to load. (d) If terminal Y is grounded, find the voltage gain from X to Z with Z open-circuited. What is the output resistance of the source follower?