*7.130 The amplifier of Fig. P7.130 consists of two identical
common-emitter amplifiers connected in cascade. Observe
that the input resistance of the second stage, Rin2, constitutes
the load resistance of the first stage.
(a) For VCC=15 V, R1=100 k, R2=47 k, RE=3.9 k,RC= 6.8 k, and ?=100, determine the dc collector
current and dc collector voltage of each transistor.
(b) Draw the small-signal equivalent circuit of the entire amplifier and give the values of all its components.
(c) Find Rin1 and vb1/vsig for Rsig=5 k.
(d) Find Rin2 and vb2/vb1.
(e) For RL=2 k, find vo/vb2.
(f) Find the overall voltage gain vo/vsig.