Engineering BE Electronics and Telecommunication Sem 4 December 2018 2018 Analog Electronics II Question Paper - Mumbai University | munotes

Questions asked in this paper

• (3) Figures to the right indicate full marks
• (4) Assume suitable data if required and mention the same in the answer sheet

1. Q1 Solve any five of the following: - 20 marks
   • (a) | What is cross over distortion? How to overcome the same Calculate bandwidth of fg and capacitance Ca of a BJT
   • (d) Define the CMRR of Differential Amplifier. Why constant current source biasing is preferred for Differential Amplifier?
   • (e) Draw the circuit diagram of widlar current source and derive the relationship between output current and reference current
   • (f) A zener voltage regulator as shown in Fig. 1f has Vz = 6.2V. The input voltage varies from 10 V to 15 V and load current is 60 mA. To hold output voltage constant under all conditions, what should be the range of series resistance (Rsmin and Rsmax) Determine the corner frequency and maximum gain of a bipolar common-emitter 10 circuit shown in Fig. 2a, with an input coupling capacitor
   • (b) Draw the circuits of OpAmp based integrator circuit and derive the expression for 10 output voltage. What are the limitations of integrator circuit and how to overcome the
2. Q3 (a) Draw the small signal equivalent circuit. of the bipolar differential amplifier. Determine its output voltage in the general form for one sided output Vo = + Acm Vem, and hence the expressions for differential mode gain and common mode 10 marks
   • (b) For the circuit shown in Fig. 3b, Transistors parameters are K, = , 10 Vin = Cos = 2pF , Coa = 0.2pF, A = 0. Find the miller capacitance, mid band voltage gain and upper cut off frequency
   • (a) For the MOSFET differential amplifier shown in Fig. 4a, the transistor parameters are 10 Kat = Kn2 = 0.1 Kn3 = Kna = 0.3 = IV for all transistors, 4 = 0 for Mi, M> and M3, for M4. Determine the bias current Ig, output resistance of current source, differential-mode voltage gain, common-mode voltage gain and CMRR for the differential amplifier
   • (b) Draw circuit diagram of cascode amplifier using BJT and derive expression for 10 voltage gain, input resistance and output resistance
3. Q5 Draw and explain the working of Class A power amplifier (transformer coupled). Derive the expression for efficiency 10 marks
   • (b) the basic three transistor current source shown in Fig. 5b, the parameters are : 10 Vt = 10V, V = OV and R; = 12KQ, for all transistors on = 0.7V, B=100 and Va = 0, Calculate value of each current shown in Fig. , i.e. Ici,
4. Q6 Write short notes on any four of the following 20 marks
   • (a) Millers Theorem
   • (b) Active Filters
   • (c) series regulator

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