*7.137 For the follower circuit in Fig. P7.137, let transistor Q1 have β =50 and transistor Q2 have β =100, and neglect the effect of ro. Use VBE = 0.7 V.
(a) Find the dc emitter currents of Q1 and Q2. Also, find the dc voltages VB1 and VB2.
(b) If a load resistance RL =1 kΩ is connected to the output terminal, find the voltage gain from the base to the emitter of Q2, vo/vb2, and find the input resistance Rib2 looking into the base of Q2. (Hint: Consider Q2 as an emitter follower fed by a voltage vb2 at its base.)
(c) Replacing Q2 with its input resistance Rib2 found in (b), analyze the circuit of emitter follower Q1 to determine its input resistance Rin and the gain from its base to its emitter, ve1/vb1.
(d) If the circuit is fed with a source having a 100- kΩ resistance, find the transmission to the base of Q1, vb1/vsig.
(e) Find the overall voltage gain vo/vsig.