(a) Use the small-signal BJT model to fi nd the input resistance Ri of the CE amplifi er of Problem 2.61, both for the unloaded case, as shown, and the case in which the output is ac coupled to a...

(a) Use the small-signal BJT model to fi nd the input resistance Ri of the CE amplifi er of Problem 2.61, both for the unloaded case, as shown, and the case in which the output is ac coupled to a 100-kV load. Comment on your results, and justify the claim that this amplifi er is of the non-unilateral type. (b) Find the output resistance Ro both for the case in which the amplifi er is driven by an ideal source vsig, and the case of a real-life source vsig having output resistance Rsig 5 1 kV. Again, comment.