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Asked: 2023-07-23T10:04:43-04:00 In:

D 12.26 Evaluate the small-signal input resistance and small-signal voltage gain of the class AB output stage in Fig. 12.13. 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-π 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 rπ = rπN || rπP and gm = gmN + gmP, and hence re = reN || reP and β = (gmN + gmP)(rπN || rπP). Now show that

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D 12.26 Evaluate the small-signal input resistance and small-signal voltage gain of the class AB output stage in Fig. 12.13. 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-π 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 rπ = rπN || rπP and gm = gmN + gmP, and hence re = reN || reP and β = (gmN + gmP)(rπN || rπP). Now show that

D 12.26 Evaluate the small-signal input resistance and small-signal voltage gain of the class AB output stage in Fig. 12.13. 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-π 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 rπ = rπN || rπP and gm = gmN + gmP, and hence re = reN || reP and β = (gmN + gmP)(rπN || rπP). Now show thatD 12.26 Evaluate the small-signal input resistance and small-signal voltage gain of the class AB output stage in Fig. 12.13. 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-π 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 rπ = rπN || rπP and gm = gmN + gmP, and hence re = reN || reP and β = (gmN + gmP)(rπN || rπP). Now show that

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