(a) Replace the BJT of Fig. P2.44 with its smallsignal model, and use the test-signal method to obtain an expression for Re. (b) Calculate Re if RC 5 10 kV, and the BJT has F 5 100, VA 5 100 V, and is...

(a) Replace the BJT of Fig. P2.44 with its smallsignal model, and use the test-signal method to obtain an expression for Re. (b) Calculate Re if RC 5 10 kV, and the BJT has F 5 100, VA 5 100 V, and is biased at IC 5 1 mA. (c) Discuss the limiting case RC → 0, and justify your result in terms of known BJT behavior. (d) Repeat part (c), but in the limiting case RC → `.