(a) Replace the FET of Fig. P3.51 with its smallsignal model, and use the test-signal method to obtain an expression for Rds. (b) Calculate Rds if R1 5 R XXXXXXXXXXMV, and the FET has gm 5 1.0 mA/V...

(a) Replace the FET of Fig. P3.51 with its smallsignal model, and use the test-signal method to obtain an expression for Rds. (b) Calculate Rds if R1 5 R2 5 1.0 MV, and the FET has gm 5 1.0 mA/V and ro 5 100 kV. (c) What is the limiting value of Rds if R1, R2, and ro are very large?