It is required to evaluate the small-signal input resistance and small-signal voltage
Chapter 12, Problem 12.25(choose chapter or problem)
It is required to evaluate the small-signal input resistance and small-signal voltage gain of the class AB output stage in Fig. 12.14. To simplify matters, assume the small-signal resistances of D1 and D2 to be negligibly small. Replace each of QN and QP with its hybrid- model and neglect ro. Hence show that the class AB stage is equivalent, from a small-signal point of view, to an emitter-follower transistor whose r = rN rP and gm = gmN +gmP, and hence re = reN reP and = (gmN +gmP)(rN rP). Now show that vo vi = RL RL +(reN reP) and Rin [RL +(reN reP)]
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