Jawaharlal Nehru Technological University Kakinada 2008 B.Tech Electronics and Communications Engineering LINEAR IC APPLICATIONS - Question Paper

analog voltage Vo.
(c) Compare merits and demerits of A/D converters. [6+6+4]
8. elaborate all basic blocks of analog multiplexer? discuss how the data selections
process is performed it. [16]
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Code No: R05310401 Set No. 3
III B.Tech I Semester Supplimentary Examinations, February 2008
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) List out various configurations of differential amplifier. discuss any 1 of
them in detail.
(b) Determine the emitter current in transistor Q3 of figure 1. If VBE = 0.7V and
ß = 100. [10+6]
Figure 1
2. (a) discuss the effect of slew rate on both open loop and closed loop op - amp
circuits.
(b) What is the major difference ranging from the power supply requirements of linear
and digital Ics.
(c) Draw and discuss an ideal voltage transfer curve for an op - amp. [8+4+4]
3. (a) What is a summer? Design a summer to add four input voltages in inverting
configuration.
(b) elaborate the differences ranging from the inverting and non-inverting terminals?
What do you mean by the term “virtual ground”.
(c) Briefly discuss about the buffers used in amplifier circuits. [6+6+4]
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Code No: R05310401 Set No. 3
4. (a) Design a logarithmic amplifier for positive input voltages in the range 5mV to
50V.
(b) With suitable circuit diagram discuss the operation of a triangular wave gen-
erator using a comparator and a integrator. [8+8]
5. (a) Derive the expression for the transfer function of second order Low pass filter.
(b) provide the functional block diagram of VCO NE 566 and discuss its working
and necessary expression for free running or center frequency. [8+8]
6. discuss an application in which the 555 timer can be used as Astable multivibrator.
[16]
7. (a) elaborate 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, discuss the operation
of a dual slope ADC. elaborate its special features? [6+10]
8. elaborate all basic blocks of analog multiplexer? discuss how the data selections
process is performed it. [16]
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Code No: R05310401 Set No. 4
III B.Tech I Semester Supplimentary Examinations, February 2008
LINEAR IC APPLICATIONS
(Electronics & Communication Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) Why is it necessary to use an external offset voltage compensating network
with practical op - amp circuits.
(b) Compare and contrast an ideal op - amp and practical op - amp.
(c) discuss the precautions that can be taken to minimize the effect of noise on
an op - amp circuit.
(d) compute the effect of variation in power supply voltages on the output-offset
voltage for an inverting amplifier circuit. [3+5+5+3]
2. (a) Compare and contrast an ideal operational amplifier and practical operational
amplifier.
(b) provide the design procedure of a compensating network for an op - amp that
uses ± 10 V supply voltages. presume necessary data. [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) Distinguish ranging from astable, bistable and monostable multivibrators.
(b) Determine VTH and VTL (TL: Lower threshold, TH: upper threshold) and
hysteresis of the inverting comparator shown in figure4 [8+8]
Figure 4
5. (a) Draw a band - pass filter circuit with its frequency response curve. discuss
its working.
(b) Design a 1st order wide band reject filter with a higher cutoff frequency of
100Hz and a lower cutoff frequency of 1kHz. compute the Q of the filter.
[8+8]
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Code No: R05310401 Set No. 4
6. (a) Draw the dc voltage versus phase difference characteristic of balanced modu-
lator phase detector of a PLL indicating all important regions.
(b) Draw the dc output voltage of VCO versus frequency characteristic of a PLL
indicating the capture and lock range clearly.
(c) State the relationship ranging from lock range and capture range through a math-
ematical expression. [6+6+4]
7. (a) Sketch and discuss the transfer characteristic of a DAC with necessary equa-
tions.
(b) LSB of a nine - bit DAC is represented by 19.6mv. If an input of nine zero bits is
represented by 0 volts.
i. obtain the output of the DAC for an input 10110 1101 and 01101 1011.
ii. What is the Full scale studying (FSR) of this DAC? [8+8]
8. (a) elaborate the various kinds of multiplexers? discuss logic diagram and truth
table of Dual four to one line multiplexer.
(b) discuss the operation of balanced modulator using neat sketch. [10+6]
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Earning:   Approval pending.