Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem Old 141101 Advance Electronics Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (Old) EXAMINATION ? WINTER 2019
Subject Code: 141101 Date: 13/12/2019
Subject Name: Advance Electronics
Time: 10:30 AM TO 01:00 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) List the parameter those affecting to the transistor at high frequencies.
Draw hybrid ? model equivalent circuit for common emitter transistor
and explain it.
07
(b) Explain how the performance of an amplifier improves with negative
feedback? Derive the expression of voltage gain and input impedance
of voltage series feedback.
07
Q.2 (a) Derive current gain of common emitter with resistive load (R L). Draw
frequency response of it with effect of RL.
07
(b) What is Common Mode Rejection Ratio (CMRR)? What is the
significance of CMRR? List and Explain the methods to improve the
CMRR.
07
OR
(b) Define the following terms: :
(1) Common Mode Gain (2) Differential Gain (3) Virtual Ground
concept of OP-AMP (4) Noise margin (5) fan-out (6) PSRR (7)Figure
of merit for logic families
07
Q.3 (a) Four identical amplifier stages are cascaded. The lower and upper 3 dB
frequencies of each stage are 40Hz and 20Khz respectively. Calculate
the overall bandwidth of the cascaded amplifier.
07
(b) Draw and explain two stages RC coupled amplifier. List the parameters
affecting the low frequency response of RC coupled amplifier.
07
OR
Q.3 (a) If an amplifier has a bandwidth of 200 KHz and a voltage gain of 100,
what will be the new bandwidth and gain if 5% negative feedback is
introduced? What is the product of gain and bandwidth before and after
the negative feedback?
07
(b) Explain important characteristics of ideal Op-Amp. 07
Q.4 (a) Draw the circuit of RC phase shift oscillator and explain the principle
of operation of RC phase shift oscillator.
07
(b) Draw OP AMP based close loop inverting amplifier with input output
waveform. Derive the gain equation of inverting amplifier.
07
OR
Q.4 (a) Draw the internal block diagram of OP-AMP and explain function of
each block.
07
(b) What is oscillator? Explain the concept of oscillation with Barkhausen
criteria.
07
Q.5 (a) What is Digital to Analog Convertor? Draw and Explain weighted
resistor DAC.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? IV (Old) EXAMINATION ? WINTER 2019
Subject Code: 141101 Date: 13/12/2019
Subject Name: Advance Electronics
Time: 10:30 AM TO 01:00 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) List the parameter those affecting to the transistor at high frequencies.
Draw hybrid ? model equivalent circuit for common emitter transistor
and explain it.
07
(b) Explain how the performance of an amplifier improves with negative
feedback? Derive the expression of voltage gain and input impedance
of voltage series feedback.
07
Q.2 (a) Derive current gain of common emitter with resistive load (R L). Draw
frequency response of it with effect of RL.
07
(b) What is Common Mode Rejection Ratio (CMRR)? What is the
significance of CMRR? List and Explain the methods to improve the
CMRR.
07
OR
(b) Define the following terms: :
(1) Common Mode Gain (2) Differential Gain (3) Virtual Ground
concept of OP-AMP (4) Noise margin (5) fan-out (6) PSRR (7)Figure
of merit for logic families
07
Q.3 (a) Four identical amplifier stages are cascaded. The lower and upper 3 dB
frequencies of each stage are 40Hz and 20Khz respectively. Calculate
the overall bandwidth of the cascaded amplifier.
07
(b) Draw and explain two stages RC coupled amplifier. List the parameters
affecting the low frequency response of RC coupled amplifier.
07
OR
Q.3 (a) If an amplifier has a bandwidth of 200 KHz and a voltage gain of 100,
what will be the new bandwidth and gain if 5% negative feedback is
introduced? What is the product of gain and bandwidth before and after
the negative feedback?
07
(b) Explain important characteristics of ideal Op-Amp. 07
Q.4 (a) Draw the circuit of RC phase shift oscillator and explain the principle
of operation of RC phase shift oscillator.
07
(b) Draw OP AMP based close loop inverting amplifier with input output
waveform. Derive the gain equation of inverting amplifier.
07
OR
Q.4 (a) Draw the internal block diagram of OP-AMP and explain function of
each block.
07
(b) What is oscillator? Explain the concept of oscillation with Barkhausen
criteria.
07
Q.5 (a) What is Digital to Analog Convertor? Draw and Explain weighted
resistor DAC.
07
2
(b) Explain Resistor Transistor Logic and Direct Coupled Transistor Logic
with advantages and disadvantages.
07
OR
Q.5 (a) Mention the types of ADC and describe successive approximation types
of ADC.
07
(b) Tabled the compare of TTL, CMOS, and ECL logic families based on
speed, fan-in, fan-out, noise immunity, power dissipation, and
application.
07
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This post was last modified on 20 February 2020