Question

Question I : Consider the amplifier circuit shown below (p-150 for both transistors) (18 marks) +12V R4 1k8 R1 15k Q1 2N3904 C2+ 10μ R2 6V 4k7 2mA Out Q2 2N3904 C1 R3 10k R5 1k8 In 10H (i) Perform DC analysis and prove that the indicated voltages and currents in the figure are correctly calculated. Find the operating point of Q1 and Q2 (5 marks) (ii) Calculate the gain of this amplifier (5 marks) (iii) In the lab, only PNP transistors were available. Redraw the complete circuit in this case (2 marks) State what is true and what is false in the following and correct the false statements (6 marks) (iv) a. This amplifier is a two-stage amplifier and therefore its gain is expected to be very high b. C and C2 are DC coupling capacitors c. C3 is a bypass capacitor d. The gain calculated inii) is the amplifier's maximum possible gain

Answer 1

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