Question Paper: Analog Electronics 2 : Question Paper Dec 2013 - Electronics & Telecomm (Semester 4) | Mumbai University (MU)
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## Analog Electronics 2 - Dec 2013

### Electronics & Telecomm. (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.
1(a) Design two stage R-C coupled amplifier using BC-547 transistor for the following parameter;AV ≥ 600,Vcc=12V,SICO≤10,lower cutoff frequency F1=10Hz.(15 marks) 1(b) For the above designed amplifier determine Av,VOmax,Rin, and Ro.(5 marks) 2(a) Design large signal transformer coupled class A power to the 4ohms load.(10 marks) 2(b) For the differential shown in fig.1 determine:,br>D C bias condition Differential mode gain Ad, Common mode gain AC and Differential mode impedance and output impedance (10 marks) 3(a) A three stage RC coupled amplifier uses FET with the following parameters:g_{m}=2.5 mA/V,r_{d}=7.5k&Omega,RD=10kΩRG=1.2MΩcoupling capacitor Cc=0.005μf and Cs=&infty.Evaluate
The overall mid-band voltage gain in dB
Lower 3dB frequency of individual stages and
Overall lower 3db frequency.
(8 marks)
3(b) Draw two stage CE amplifier and derive the expression for
Small signal mid-band voltage gain
Input impedance and
Output impedance.
(12 marks)
4(a) For the feedback amplifier shown in fig.2(i)Identify the type of feedback and (ii)Derive the expression for AVF,RIFand ROFusing negative feedback approach. (12 marks) 4(b) Explain the working principle of a wein bridge oscillator.Derive the expression for the frequency of oscillation and the value of gain required for sustained oscillation.(8 marks) 5(a) Enumerate the effects of negative feedback on
gain
frequency response
Distortion
Noise and
Input and output impedance.
(8 marks)
5(b) For the amplifier shown in fig.3 determine VB1,VB2,ICQ,Av,Ri and Ro (12 marks) 6(a) Draw the circuit diagram for class B push -pull amplifier and derive the expression for conversion efficiency.(10 marks) 6(b) With neat sketch,explain the working of an emitter coupled astable multivibrator.State the advantages of emitter coupled astable multivibrator.(10 marks)

### Write a short note on following

7(a) Colpitts oscillator(5 marks) 7(b) Frequency response of R-C,Direct coupled transformer coupled amplifier(5 marks) 7(c) Crossover Distortion in power amplifier.(5 marks) 7(d) Class C power amplifier.(5 marks)