Analog Electronics - 1 : Question Paper Dec 2015 - Electronics & Telecomm. (Semester 3)

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Analog Electronics - 1 - Dec 2015

Electronics & Telecomm. (Semester 3)

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.

Attempt any four:

1 (a) Draw Input and Output characteristics of BJT in common emitter configuration.(5 marks) 1 (b) Draw small signal hybrid π equivalent circuit for npn transistor.(5 marks) 1 (c) Explain effect of temperature on JFET and derive equation for zero current drift.(5 marks) 1 (d) Calculate I_B, I_C & V_CE for common emitter circuit. (5 marks) 1 (e) Find I_B, I_C & V_CE for following circuit. (5 marks) 2 (a) Draw output waveform for clamper and clipper circuits.

(i)

(ii)

(10 marks) 2 (b) Explain construction & characteristics of n channel Enhancement MOSFET. Draw transfer characteristics & drain characteristics.(10 marks) 3 (a) For JFET amplifier shown below, Calculate Av, Zi, Zo.

(10 marks) 3 (b) For the circuit shown below, calculate I_DQ & V_DSQ. It is given that I_D(ON)=6 mA, V_GS(ON)=8V. Vth=3V.

(10 marks) 4 (a) Explain the working of Wein Bridge Oscillator. Derive the expression for frequency of oscillation for sustained oscillations.(10 marks) 4 (b) Calculate voltage gain of FET amplifier.

Y_os=40μs
I_DSS=8mA
V_GS off=-4V (10 marks) 5 (a) Draw & explain energy band diagram of MOS capacitor operating in
i) Accumulation
ii) Depletion
iii) Inversion mode(10 marks) 5 (b) Draw emitter follower circuit and derive an expression for voltage gain Av.(10 marks) 6 (a) Draw circuit diagram for phase shift oscillator & derive an expression for frequency of oscillation.(10 marks)

Write short notes on any two:

6 (b) (i) Photodiodes(5 marks) 6 (b) (ii) LC Oscillators(5 marks) 6 (b) (iii) Transistor as a switch(5 marks) 6 (b) (iv) Schottky diode(5 marks)

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