Problem 2 (32 pts) For the amplifier circuit shown in Fig. 2, VB=0.7V B=100, V+=0.026V, gm-Ico/Vr, m =B/gm, A=0. 1) [2pts] Draw the dc equivalent circuit and mention the configuration (Common Emitter, or Emitter follower, or Common Base). 2) [3pts] Find the value of RE. 3) [4pts] Check for active mode (active mode: IB >0 and Vc> VB or VCE > 0.2). 4) [2pts] Judge on the biasing of the transistor (good, bad) and briefly explain why. 5) [3pts] Draw the small-signal equivalent circuit of the amplifier. ac gain the voltage Find 6) [4pts] (Avin Vo/Vin). Does it amplify voltages? 7) [4pts] Find the input impedance Zin as shown in Fig. 2. Then deduce the voltage gain Avs Vo/Vs. [Hint: Vo/Vs=(Vo/Vin)(Vin/Vs)]. 8) [4pts] Find the output impedance Zout as shown in Fig. 2. 9) [4pts] Find the ac current gain (A=io/is). 10) [2pts] Find the ac power gain G. Does it amplifier power? VCC=15V IMA C2 RB1 1.4 Rs C1 is ww 0.2k + 6.TV Zin Zout vin RE? Fig. 2