Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) ECE (Electronic engineering) 2017 Scheme 2020 January Previous Question Paper 4th Sem 17EC45 Linear Integrated Circuits
Fourth Semester B.E. Degree Examination, De.20.19

/Jan.2020
Linear Integrated Circuits
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full queStion from each module.
Module1
1 a. Define the following parameter of OpAmp and also mention its typical values of 741:
i) CMRR ii) Slew rate iii) Power supply voltage rejection. (06 Marks)
b. Design an inverting amplifier using a 741 OpAmp. 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
2 a. Discuss the methods of offset nulling in OpAmp circuit. (06 Marks)
b. Design a Noninverting amplifier using 741OpAmp, is to amplify the input voltage of
100mV to a level of 3V output. (07 Marks)
c. Explain the various methods of Biasing OpAmp. (07 Marks)
Module2
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)
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 OpAmp. (08 Marks)
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
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)
Module3
5
a.
Prove that V
o(wmpl
=
R,
1 +  
KT V,,,
f of a log amplifier. (08 Marks)
RT
c
. /
? ,,
q V
re 1 /
(
b. Sketch and explain the working of phase shift oscillator using OpAmp and also write the
design equations.
(08 Marks)
c. What are the applications of analog multipliers?
(04 Marks)
USN
17EC45
1 of 2
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Fourth Semester B.E. Degree Examination, De.20.19

/Jan.2020
Linear Integrated Circuits
Time: 3 hrs. Max. Marks: 100
Note: Answer any FIVE full questions, choosing ONE full queStion from each module.
Module1
1 a. Define the following parameter of OpAmp and also mention its typical values of 741:
i) CMRR ii) Slew rate iii) Power supply voltage rejection. (06 Marks)
b. Design an inverting amplifier using a 741 OpAmp. 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
2 a. Discuss the methods of offset nulling in OpAmp circuit. (06 Marks)
b. Design a Noninverting amplifier using 741OpAmp, is to amplify the input voltage of
100mV to a level of 3V output. (07 Marks)
c. Explain the various methods of Biasing OpAmp. (07 Marks)
Module2
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)
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 OpAmp. (08 Marks)
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
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)
Module3
5
a.
Prove that V
o(wmpl
=
R,
1 +  
KT V,,,
f of a log amplifier. (08 Marks)
RT
c
. /
? ,,
q V
re 1 /
(
b. Sketch and explain the working of phase shift oscillator using OpAmp and also write the
design equations.
(08 Marks)
c. What are the applications of analog multipliers?
(04 Marks)
USN
17EC45
1 of 2
Fig.Q.6(c)
OR
6 a. Draw an OpAmp 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)
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)
Module4
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
OpAmp with
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)
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
= 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)
Module5
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
11) t l
ow
iii) free running frequency
iv) Duty cycle
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.
(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)
2 oft
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This post was last modified on 02 March 2020