Tuesday, October 4, 2011

jntu previous year question university question paper LINEAR IC APPLICATIONS 3rd year first semester ECE department nov. 2007

jntu previous year question university question paper LINEAR IC APPLICATIONS 3rd year first semester ECE department nov. 2007

jntu previous year question university question paper LINEAR IC APPLICATIONS 3rd year first semester ECE department nov. 2007

III B.Tech I Semester Regular Examinations, November 2007
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Explain the use of constant bias circuit in operation of differential amplifier.
(b) Analyze the dual input balanced output configuration of differential amplifier
using DC. [8+8]
2. (a) Explain how the input offset voltage compensated for?
(b) How fast can the output of an op - amp change by 10V, if its slew rate is 1
V/µs.
(c) Define thermal drift & slew rate. [6+4+6]
3. (a) Design a differentiator to differentiate an input signal that varies in frequency
from 10 Hz to about 1KHz. If a sine wave of 1V peak at 1000 Hz is applied
to this differentiator draw the output waveforms.
(b) Why active differentiator circuits are not used in analog computer to solve
differential equations. [10+6]
4. (a) Explain, How to obtain triangular wave using a square wave generator.
(b) With the help of a neat circuit diagram explain the working of a logarithmic
amplifier. [8+8]
5. (a) Define Bessel, Butterworth and Chebysher filters, and compare their frequency
response.
(b) Sketch the circuit diagram of band elimination filter and design a wide band-
reject having fH=200Hz and fL=1KHz. Assume necessary data. [8+8]
6. Explain an application in which the 555 timer can be used as Astable multivibrator.
[16]
7. (a) Compare R - 2R and weight resistor types of DACs.
(b) Write short notes on A/D converters.
(c) Define the following terms as related to DAC:
i. Linearity
ii. Resolution. [8+4+4]
8. What are all basic blocks of analog multiplexer? Explain how the data selections
process is performed it. [16]

III B.Tech I Semester Regular Examinations, November 2007
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Explain how large open circuit voltage gain of an op - amp can be obtained
by using cascading of differential amplifier stages.
(b) Explain ac analysis of differential amplifier. [8+8]
2. (a) Discuss the Pole - Zero and Dominant pole compensation techniques for an
op - amp.
(b) An op - amp has a slew rate of 1.5V/µs. What is the maximum frequency of
an output sinusoid of peak value 10 V at which the distortion sets in due to
the slew rate limitation? [8+8]
3. (a) Design a differentiator to differentiate an input signal that varies in frequency
from 10 Hz to about 1KHz. If a sine wave of 1V peak at 1000 Hz is applied
to this differentiator draw the output waveforms.
(b) Why active differentiator circuits are not used in analog computer to solve
differential equations. [10+6]
4. (a) Describe the operation of logarithmic amplifier using op - amp.
(b) List the conditions for oscillation in all the three types of oscillators, namely,
RC phase shift, Wien - bridge and quadrature oscillators. [8+8]
5. (a) Draw the wide band reject filter circuit and also the frequency response of it.
(b) Draw the schematic diagram of an all pass filter and determine the phase shift
φ between the input and output at f = 2kHz. [8+8]
6. (a) Configure a 555 timer as a Schmitt trigger and explain.
(b) Explain frequency translation and FSK demodulation using 565 PLL. [8+8]
7. (a) Explain the difference between Analog to Digital converter and Digital to
Analog converters through underlying equations.
(b) Illustrate one application each of Analog to Digital and Digital to Analog
converters. [6+10]
8. (a) Explain the function of a typical adjustable voltage regulator. How can you
increase the current driving capacity of the regulator?
(b) Describe the principle of working of a balanced modulator using op - amp.
Give the applications of it. [6+10]

III B.Tech I Semester Regular Examinations, November 2007
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions


All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Explain how large open circuit voltage gain of an op - amp can be obtained
by using cascading of differential amplifier stages.
(b) Explain ac analysis of differential amplifier. [8+8]
2. (a) Calculate the effect of variation in power supply voltages on the output offset
voltage for an op - amp circuit.
(b) Why frequency compensation is required for an op - amp and explain frequency
compensation technique using suitable diagrams. [6+10]
3. (a) Design a differentiator to differentiate an input signal that varies in frequency
from 10 Hz to about 1KHz. If a sine wave of 1V peak at 1000 Hz is applied
to this differentiator draw the output waveforms.
(b) Why active differentiator circuits are not used in analog computer to solve
differential equations. [10+6]
4. (a) Derive the expression of the output voltage of an antilog amplifier using op -
amp.
(b) Design a saw tooth wave form generator using op - amp and plot the waveforms
for the given specifications frequency: 5kHz, Vsat = ± 15V (Assume necessary
data). [8+8]
5. (a) For the all pass filter, determine the phase shift φ between the input and output
at f = 2kHz. To obtain a phase shift φ , what modifications are necessary in
the circuit?
(b) Derive the expression for the transfer function of 2nd order High pass filter.
[8+8]
6. (a) Explain the operation of Monostable multivibrator using 555 timer. Derive
the expression of time delay of a Monostable multivibrator using 555 timer.
(b) Design monostable multivibrator using 555 timer to produce a pulse width of
100 m sec. [10+6]
7. (a) What are the basic blocks preceding an Analog to Digital converter in a typical
application like digital audio recording?
(b) With the help of a neat circuit diagram and waveforms, explain the operation
of a dual slope ADC. What are its special features? [6+10]
8. Write short notes on:
1 of 2
Code No: R05310401 Set No. 3
(a) IC 1496 and its applications
(b) Sample and hold circuit. [16]

III B.Tech I Semester Regular Examinations, November 2007
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆ ⋆ ⋆ ⋆ ⋆
1. (a) Discuss the differences between the differential amplifiers used in the first two
stages of op - amp.
(b) Compare and contrast an ideal op - amp and practical op - amp.
(c) Draw an ideal voltage transfer curve of an op - amp. [8+5+3]
2. (a) What are the three factors that effect the electrical parameters of an op - amp
(b) Compare and contrast an ideal op - amp and practical op - amp.
(c) What are the features of 741 op - amp and also draw the pin diagram.[3+6+7]
3. (a) Draw the circuit diagram of a two input non-inverting type summing amplifier
and derive the expression for the output voltage.
(b) Briefly explain why negative feedback is desirable in amplifier applications.
(c) How does negative feedback affect the performance of an inverting amplifier?
[7+5+4]
4. (a) Derive the expression of the output voltage of an antilog amplifier using op -
amp.
(b) Design a saw tooth wave form generator using op - amp and plot the waveforms
for the given specifications frequency: 5kHz, Vsat = ± 15V (Assume necessary
data). [8+8]
5. (a) List the conditions for oscillation in all the three types of oscillators, namely,
RC phase shift, Wien - bridge and quadrature oscillators.
(b) Design an op ? amp based relaxation oscillator and derive the frequency of
oscillation. [8+8]
6. (a) Draw the circuit of PLL as frequency multiplier and explain its working.
(b) Explain with neat diagram how 555 timers can be used as a Schmitt trigger.
[8+8]
7. (a) Sketch and explain the transfer characteristic of a DAC with necessary equa-
tions.
(b) LSB of a 9 - bit DAC is represented by 19.6mv. If an input of 9 zero bits is
represented by 0 volts.
i. Find the output of the DAC for an input 10110 1101 and 01101 1011.
ii. What is the Full scale reading (FSR) of this DAC? [8+8]
8. (a) Describe the operation of four quadrant multiplier with neat diagram.
(b) Explain the operation of IC 1496 as mixer circuit. [8+8]

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