The BJT in the ac circuit of Fig. P4.9 has gm 5 1y(25 V), r5 5 kV, ro 5 50 kV, and r5 50 MV. Moreover, ii is a 1-A ac source. (a) Find the ac voltages vi and vo for the idealized case RE 5 RL 5 r5 `....

The BJT in the ac circuit of Fig. P4.9 has gm 5 1y(25 V), r5 5 kV, ro 5 50 kV, and r5 50 MV. Moreover, ii is a 1-A ac source. (a) Find the ac voltages vi and vo for the idealized case RE 5 RL 5 r5 `. (b) Repeat (a), but with r5 50 MV. Repeat (a), but with r5 50 MV and for the following signifi cant cases: (c) RL 5 r, (d) RL 5 0 1 1)ro, (e) RL 5 ro, (f) RL 5 r. Comment on your results, and identify the two extremes of monolithic (large RC) and discrete (small RC) design. (g) Repeat (a), but with RE 5 Re.