Figure P12.26 shows a class AB output stage with a common-emitter transistor added to
Chapter 12, Problem 12.26(choose chapter or problem)
Figure P12.26 shows a class AB output stage with a common-emitter transistor added to increase the voltage gain and reduce the current that vI has to supply. Neglecting the small-signal resistances of D1 and D2, find the small-signal voltage gain vo/vi . (Hint: Use the expressions for voltage gain and input resistance of the class AB stage without Q3, given in the statement for 12.25.) QN QP Q3 D2 D1 vI vO IBIAS VCC VCC RL Figure P12.26 1
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