In the circuit of Fig. P3.65, utilizing two depletion-type FETs, M1 acts as a voltage follower, M2 as a current sink to bias M1, and R controls the bias current. (a) Assuming 65-V power supplies and...

In the circuit of Fig. P3.65, utilizing two depletion-type FETs, M1 acts as a voltage follower, M2 as a current sink to bias M1, and R controls the bias current. (a) Assuming 65-V power supplies and matched FETs with Vt 5 21.5 V and k 5 2.0 mA/V2 , specify R to bias the FETs at 1 mA. What is the value of vO when vI 5 0? (b) Assuming 5 0.025 V21 , fi nd Ri , Ro, and voyvi . (c) What is the range of values of vI over which the circuit will operate properly, with each FET in the active region?