Download VTU BE 2020 Jan [folder1] 4th Sem 17EC45 Linear Integrated Circuits Question Paper

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Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full queStion from each module.
Module-1
1 a. Define the following parameter of Op-Amp and also mention its typical values of 741:
i) CMRR ii) Slew rate iii) Power supply voltage rejection. (06 Marks)

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b. Design an inverting amplifier using a 741 Op-Amp. The voltage gain is to be 50 and output
voltage amplitude is to be 2.5V. (07 Marks)
c. Derive the expression for output voltage of a difference amplifier and also explain the
common mode nulling. (07 Marks)
OR

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2 a. Discuss the methods of offset nulling in Op-Amp circuit. (06 Marks)
b. Design a Non-inverting amplifier using 741-Op-Amp, is to amplify the input voltage of
100mV to a level of 3V output. (07 Marks)
c. Explain the various methods of Biasing Op-Amp. (07 Marks)
Module-2

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3 a. Sketch and explain high Z
o
, capacitor coupled voltage follower with necessary design steps
and also show that the input impedance is very high as compared to direct coupled voltage
follower. (08 Marks)

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b. Design inverting amplifier circuit is to be capacitor coupled and to have a signal frequency
range of 10Hz to 1 kHz. If load resistance is 2500 with Av = 50 and V
0
= 3V. Use
741 Op-Amp. (08 Marks)

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c. What is Precision Rectifiers? Mention the advantages of it. (04 Marks)
OR
4 a. Sketch precision full wave rectifier using HWR and summing circuit and explain it.
(08 Marks)
b. What is instrumentation amplifier? Compare differential input/output amplifier and a

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difference amplifier. (06 Marks)
c. Design a basic current amplifier circuit has an input current of lmA and a l 00f load
resistor. The current gain is 5.
(06 Marks)
Module-3

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5
a.
Prove that V
o(wmpl
=

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R,
1 + ---- -
KT V,,,
f of a log amplifier. (08 Marks)
RT

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c
. /
? ,,
q V
re 1 /

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(
b. Sketch and explain the working of phase shift oscillator using Op-Amp and also write the
design equations.
(08 Marks)
c. What are the applications of analog multipliers?

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(04 Marks)
USN
17EC45
1 of 2
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AF?k, C
Fourth Semester B.E. Degree Examination, De-.-20.19
-
/Jan.2020
Linear Integrated Circuits

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Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full queStion from each module.
Module-1
1 a. Define the following parameter of Op-Amp and also mention its typical values of 741:
i) CMRR ii) Slew rate iii) Power supply voltage rejection. (06 Marks)

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b. Design an inverting amplifier using a 741 Op-Amp. The voltage gain is to be 50 and output
voltage amplitude is to be 2.5V. (07 Marks)
c. Derive the expression for output voltage of a difference amplifier and also explain the
common mode nulling. (07 Marks)
OR

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2 a. Discuss the methods of offset nulling in Op-Amp circuit. (06 Marks)
b. Design a Non-inverting amplifier using 741-Op-Amp, is to amplify the input voltage of
100mV to a level of 3V output. (07 Marks)
c. Explain the various methods of Biasing Op-Amp. (07 Marks)
Module-2

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3 a. Sketch and explain high Z
o
, capacitor coupled voltage follower with necessary design steps
and also show that the input impedance is very high as compared to direct coupled voltage
follower. (08 Marks)

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b. Design inverting amplifier circuit is to be capacitor coupled and to have a signal frequency
range of 10Hz to 1 kHz. If load resistance is 2500 with Av = 50 and V
0
= 3V. Use
741 Op-Amp. (08 Marks)

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c. What is Precision Rectifiers? Mention the advantages of it. (04 Marks)
OR
4 a. Sketch precision full wave rectifier using HWR and summing circuit and explain it.
(08 Marks)
b. What is instrumentation amplifier? Compare differential input/output amplifier and a

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difference amplifier. (06 Marks)
c. Design a basic current amplifier circuit has an input current of lmA and a l 00f load
resistor. The current gain is 5.
(06 Marks)
Module-3

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5
a.
Prove that V
o(wmpl
=

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R,
1 + ---- -
KT V,,,
f of a log amplifier. (08 Marks)
RT

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c
. /
? ,,
q V
re 1 /

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(
b. Sketch and explain the working of phase shift oscillator using Op-Amp and also write the
design equations.
(08 Marks)
c. What are the applications of analog multipliers?

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(04 Marks)
USN
17EC45
1 of 2
Fig.Q.6(c)

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OR
6 a. Draw an Op-Amp sample and hold circuit. Sketch the input signal, control, outpt
waveforms and explain the circuit operation. (08 Marks)
b. Explain the operation of a inverting Schmitt triggering with two different level of trigger
points using diodes. (08 Marks)

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c. For the voltage detector shown in Fig.Q.6(c). Design a value of RI and R2. Assume
V
R
2
=1.5V. (04 Marks)

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Module-4
7 a. Sketch the circuit and frequency response of a first order low pass filter and explain its
operation. (06 Marks)
b. / Design a second order high pass filter to have a cut off frequency of 12kHz. Use a
Op-Amp with

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IB(max) =
1.5uA. (07 Marks)
c. List and explain the characteristics of three terminal IC regulators. (07 Marks)
OR
8 a. Draw the functional block diagram of a 723 regulator and explain it. (06 Marks)

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b. Explain how fixed regulator can be used as adjustable regulator. Design fixed voltage
regulator using 7805 to get an output of 7.5V. Assume I
R,
= 25mA and I
Q

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= 4.2mA.
(07 Marks)
c. Discuss the differences between wide band and narrow band pass filter. Sketch typical
frequency response for each. Write the equations relating Q, B, ti and f2. (07 Marks)
Module-5

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9 a. Draw the block diagram of a PLL and explain the functions of each block. (06 Marks)
b. A 555 Astable multivibrator has RA = 2.21M, RB = 6.81(.0 and C = 0.010. Calculate:
1) thi
g
h

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11) t l
ow

iii) free running frequency
iv) Duty cycle

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and also draw the connection diagram (07 Marks)
C.

Derive the expression of pulse width of a monostable multivibrator using 555 IC timer and
also design a monostable multivibrator with pulse width of 0.25msec. Assume C = 0.1uF.

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(07 Marks)
OR
10 a. Derive the expression of output voltage of a R ? 2R ladder type DAC. (08 Marks)
b. Draw the block diagram of a successive approximation type ADC and explain it. (08 Marks)
c. Mention the applications of monostable multivibrator using 555 timer. (04 Marks)

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