The MOSFET in the amplifier circuit below has Vt = 0.6 V and kn = 5 mA/V2. Note that VA is sufficiently large so that we can ignore the Early effect. The input small signal vsig has a zero average. (a) It is required to bias the transistor to operate at an overdrive voltage Vov = 0.2 V. What must the dc voltage at the drain be? Calculate the dc drain current ID. What value must RD be? (b) Calculate the value of gm at the bias point. (c) Use the small signal equivalent circuit of the amplifier to show that