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Q3) Consider the BJT amplifier circuit given in Fig. Q3-1. Vcc=10 V, VBB =2 V, RB =50 k-2, Rc=1 ks and Rư=1 k.2. Cc is a coupling capacitor. The transistor parameters are given as B=100, VBE,on=0.7 V and VCE,sat = 0.2 V. Consider the thermal voltage (VT) to be 25 mV. 3.1 Draw the dc circuit of the amplifier circuit given in Fig. 23-1 3.2 Calculate the following currents and voltages at the quiescent point (Q-point) of the transistor a) Base current (IBO) b) Collector current (Ice) c) Emitter to Collector voltage (VCEQ) (02 marks) (10 marks) (03 marks) 3.3 Calculate the power dissipation of the transistor at the Q-point. 3.4 Draw the ac circuit for the circuit given in Fig. 23-1. (Use the small signal transistor model given in Fig. 23-2) 3.5 Calculate the trans-conductance (Gm) and small signal input resistance between base and emitter (02 marks) 3.6 Determine the voltage gain (V/vs). (04 marks) (04 marks)
Vcc ib B RC + Cc RB 8m 'be vo www Vbe Vce Us 호두 RL VBB E Fig. Q3-1 Fig. 23-2