Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem Old 141101 Advance Electronics Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (OLD) EXAMINATION ? WINTER 2018
Subject Code:141101 Date: 05/12/2018
Subject Name: Advance Electronics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Draw hybrid ? equivalent circuit for common emitter transistor. Also
derive the expression for input conductance (gb?e )..
07
(b) What is feedback? List the advantages of negative feedback. Derive
relation between gain with and without feedback in a transistor
amplifier.
07
Q.2 (a) Explain briefly the following terms:
(1)Virtual Ground concept of OP-AMP (2) ?Barkhausen criteria? for
oscillator circuit.
07
(b) Draw hybrid ? ? circuit for a single stage CE transistor amplifier having
load resistance RL and obtain expression for short-circuit current gain
and bandwidth.
07
OR
(b) Define the following terms: :
(1) Common Mode Gain (2) Differential Gain (3) PSRR (4)Noise
margin (5) fan-out (6) Common Mode Rejection Ratio (7)Figure of
merit for logic families
07
Q.3 (a) Three cascaded stages amplifier have an upper 3 dB frequency of 16
KHz and a lower 3 dB frequency of 25 Hz. What are the values of f L
and fH of each stage? Assume that all the stages are identical. Also
calculate the bandwidth of each stage.
07
(b) Explain in detail two stages RC coupled amplifier with its frequency
response.
07
OR
Q.3 (a) For the voltage amplifier AV = 140, fL=200 Hz, fH = 200 KHz, Ri =
2K?, Ro = 4.7K?. When negative feedback is employed in it with ?
= 0.4, determine the Avf, Rif, Rof, F LH, FHF.
07
(b) Explain important characteristics of ideal Op-Amp. 07
Q.4 (a) Draw the symbol and AC equivalent circuit of a Crystal oscillator and
explain the principle of operation of Crystal Oscillator.
07
(b) What is the significance of CMRR? List and explain the methods to
improve the CMRR.
07
OR
Q.4 (a) Draw the equivalent circuit of a practical OP-AMP and explain the
significance of each component shown in it.
07
(b) Draw op-amp based Wien bridge oscillator. Obtain frequency of
oscillation and discuss amplitude stabilization for the same.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (OLD) EXAMINATION ? WINTER 2018
Subject Code:141101 Date: 05/12/2018
Subject Name: Advance Electronics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Draw hybrid ? equivalent circuit for common emitter transistor. Also
derive the expression for input conductance (gb?e )..
07
(b) What is feedback? List the advantages of negative feedback. Derive
relation between gain with and without feedback in a transistor
amplifier.
07
Q.2 (a) Explain briefly the following terms:
(1)Virtual Ground concept of OP-AMP (2) ?Barkhausen criteria? for
oscillator circuit.
07
(b) Draw hybrid ? ? circuit for a single stage CE transistor amplifier having
load resistance RL and obtain expression for short-circuit current gain
and bandwidth.
07
OR
(b) Define the following terms: :
(1) Common Mode Gain (2) Differential Gain (3) PSRR (4)Noise
margin (5) fan-out (6) Common Mode Rejection Ratio (7)Figure of
merit for logic families
07
Q.3 (a) Three cascaded stages amplifier have an upper 3 dB frequency of 16
KHz and a lower 3 dB frequency of 25 Hz. What are the values of f L
and fH of each stage? Assume that all the stages are identical. Also
calculate the bandwidth of each stage.
07
(b) Explain in detail two stages RC coupled amplifier with its frequency
response.
07
OR
Q.3 (a) For the voltage amplifier AV = 140, fL=200 Hz, fH = 200 KHz, Ri =
2K?, Ro = 4.7K?. When negative feedback is employed in it with ?
= 0.4, determine the Avf, Rif, Rof, F LH, FHF.
07
(b) Explain important characteristics of ideal Op-Amp. 07
Q.4 (a) Draw the symbol and AC equivalent circuit of a Crystal oscillator and
explain the principle of operation of Crystal Oscillator.
07
(b) What is the significance of CMRR? List and explain the methods to
improve the CMRR.
07
OR
Q.4 (a) Draw the equivalent circuit of a practical OP-AMP and explain the
significance of each component shown in it.
07
(b) Draw op-amp based Wien bridge oscillator. Obtain frequency of
oscillation and discuss amplitude stabilization for the same.
07
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2
Q.5 (a) What is Digital to Analog Convertor? Draw and Explain R-2R DAC?
Also give the advantages and disadvantages of R-2R Digital to Analog
convertor.
07
(b) Explain in detail two input TTL-NAND Gate (Totempole Output) 07
OR
Q.5 (a) Tabled the compare of TTL,CMOS, and ECL logic families based on
speed, fan-in, fan-out, noise immunity, power dissipation, and
application.
07
(b) Explain working of successive approximation ADC with block
diagram.
07
*************
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This post was last modified on 20 February 2020