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6.19 (a) Assuming C4 0, show that the voltage gain of the emitter follower of Fig. 6.30a has the pole-zero frequency pair (R, + R2)r,C pa za Rs.g + T, and R2 - Rllr. where R, sig (b) Show that the impedance Z, has the pole-zero frequency pair PI (c) Show that the impedance Z, has the zero-pole frequency pair co(R,//r,)C7 (B+R,+ r How do the above expressions simplify if P, is large? rb sig sig Zo Zi RL FGURE 6.30 (a) The emitter follower and (b) its high-frequency smal-signal model.

Answer 1