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Q.1 As an engineer, you are responsible to design a small signal amplifier based on common emitter MOSFET with bypass capacitor configuration. State TWO (2) criteria that you would consider in your design, to obtain maximum undistorted output signal and Q-point stability. (2 marks) Q.2 Explain briefly why base current, In in bipolar junction transistor (BJT) has the smallest current compared to collector current, Ic and emitter current, IE. (2 marks)
Q.3 A bipolar junction transistor (BJT) amplifier circuit as in Figure B.2 has the following specifications: B = 140, VB=0.3 V. Vr=26 mV and ro= 0. (a) Show that Ico-4.3 mA. (b) (c) (d) Rs 50 £2 www Calculate VCEQ Ra 693 ΚΩ C₁ 10μF (e) Deto nine v/v IZ V Vec 24V VE RE 60002 Figure B.2 Re 2.4k Ico Vae Draw the hybrid-z ac equivalent circuit at mid-frequency. C₂ 20 μF C₁ 50 µF Calculate gm, I. input impedance (Z.) and output impedance (Z.). R₁ 4.7k02 Zo Vo (3 marks) (3 marks) (4 marks) (6 marks) (4 marks)