1.
RAGHU ENGINEERING COLLEGE(Autonomous)
(Approved by AICTE, New Delhi, Accredited by NBA(ECE, EEE, MECH, CSE), NAAC with ‘A’ grade &
Permanently Affiliated to JNTU ,Kakinada)
Dakamarri, Bheemunipatnam Mandal, Visakhapatnam Dist. -531162(A.P)
Ph: +91-8922-248001, 248002 Fax: +91-8922-248011
email: principal@raghuenggcollege.com website: www.raghuenggcollege.com
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
Subject: Linear IC Applications Year and Semester: III B.Tech.- I Sem.
Branch: ECE Sections: A,B,C and D
UNIT – IV
Q. No. LONG ANSWERS QUESTION CO TYPE
MAR
KS
1
A.
Design a second order lowpass filter with a cutoff frequency of 1.5
KHz.
4 E 6
B.
Derive the transfer function of first order lowpass filter. Also draw
and explain the frequency response of it.
4
E 6
2
A.
Design a first order low pass filter for a high cut-off frequency of 2
kHz and pass band gain of 2.
4
E 6
B. Explain the types of active filters with neat diagrams.
4
E 6
3
A.
Design a second order lowpass Butterworh filter with a cutoff
frequency of 2KHz .
4
E 6
B.
Define Filter. Give the classification of filters. What are the
advantages of active filters over passive filters?
4
E 6
4
A.
Derive the transfer function of first order high pass filter. Draw and
explain the frequency response of it.
4
E 6
B.
For a first order butterworth high pass filter, evaluate cut-off
frequencies fc and wc if R=15KΩ and C=0.01μF. Evaluate the
passband gain if RF = 10KΩ and R1=5KΩ.
4
E 6
5
A.
Design a first order butterworth high pass filter for a cutoff frequency
of 10KHz.
4
E 6
B.
What is frequency scaling? For a 1st order Butterworth low-pass
filter, calculate the cut-off frequency if R=10KΩ and C=0.001μF and
pass band gain of 2. If the cutoff frequency is changed to 50KHz, find
the values of R and C for the same passband gain.
4
E 6
6
A. Derive the transfer function of first order high pass filter.
4
M 6
B.
Design a second order high pass filter with cutoff frequency of
20KHz and pass band gain of 10.
4
M 6
7 A.
Design a wide bandpass filter for fL=100Hz and fH=1KHz and
passband gain equal to 4. Also calculate the value of its quality factor.
4
M 12
8 A.
Give the design procedure of narrow bandpass filter. Design a narrow
bandpass filter for the following specifications: fc=2KHz, AF= 10,
Q=100. Evaluate new component values to change the center
frequency to 1KHz without disturbing the values of AF and
bandwidth.
4
M 12
9 A.
Define bandpass filter. Draw and explain the operation of wide and
narrow bandpass filters and also give its design procedure.
4
M 12
10 A. Design a wide band reject filter having fH=100Hz and fL=2KHz.
4
M 12
11 A.
Explain the operation of narrow band reject filter. Give the design
procedure for designing notch filter. Design an active notch filter for
rejecting the mains frequency of 50Hz using twin-T network.
4
T 12

2.
RAGHU ENGINEERING COLLEGE(Autonomous)
(Approved by AICTE, New Delhi, Accredited by NBA(ECE, EEE, MECH, CSE), NAAC with ‘A’ grade &
Permanently Affiliated to JNTU ,Kakinada)
Dakamarri, Bheemunipatnam Mandal, Visakhapatnam Dist. -531162(A.P)
Ph: +91-8922-248001, 248002 Fax: +91-8922-248011
email: principal@raghuenggcollege.com website: www.raghuenggcollege.com
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
12 A.
Draw the circuit diagram of all pass filter. Derive the expression for
output voltage and phase angle of all pass filter.
4
T 12
13
A.
For a wide bandpass filter, if the cutoff frequencies are 200Hz and
1KHz respectively, evaluate the center frequency and quality factor
Q. If another filter has a Q=0.8 with the same value of fC, then which
one of them is more selective.
4
T 6
B.
For the all pass filter with R=10KΩ and C=0.01μF, evaluate the
phase shift ϕ between the input and output voltages at f=2KHz.
4
T 6
14
A.
Design a wide bandpass filter to meet the following specifications:
f1=5KHz and f2= 15KHz with a passband gain of 4.
4
T 6
B.
Design an active notch filter for rejecting the frequency of 500Hz
using narrow band pass filter.
4
T 6
15 A.
Design a second order wide bandpass filter for fL=200Hz and
fH=2KHz and passband gain equal to 16. Also calculate the value of
its quality factor.
4
T 12
UNIT - V
Q. No. LONG ANSWERS QUESTION CO TYPE MARKS
1 A.
Discuss the 555 timer in Astable operation. Also discuss
the applications for it.
5 T 12
2 A.
Discuss with relevant circuits and waveforms the working
of Monostable multivibrator using 555 timer.
5
E 12
3 A. Draw the block diagram of PLL and explain its operation.
5
E 12
4 A.
Draw block diagram of 555 timer and explain the function
of each pin.
5
E 12
5 A.
Design an Astable multivibrator using 555 timer for a
frequency of 10 KHz and a duty cycle of 50%.Assume
C=0.1μf.
5
E 12
6 A.
Derive the expression for Time period of an astable
multivibrator using 555 timer.
5
M 12
7 A.
Explain how 555 timer is used as Schmittigger circuit with
a neat sketch.
5
T 12
8 A.
Design an Astable multivibrator with 50 % duty cycle
using 555 timer.
5
M 12
9 A.
Design an Astable multivibrator using 555 timer for a
frequency of 1 kHz and a duty cycle of 70%.Assume
C=0.1μf.
5
M 12
10 A.
Draw the circuit of an Astable multivibrator using Op-Amp
and derive the expression for its frequency of oscillations.
5
M 12
11 A.
Discuss about any two applications of 555 timer
monostable multivibrator
5
T 12
12 A.
Define the terms: i) free-running frequency f0 , (ii) lock
range, (iii) capture range, and (iv) pull-in time, pertaining
to PLL.
5
T 12

3.
RAGHU ENGINEERING COLLEGE(Autonomous)
(Approved by AICTE, New Delhi, Accredited by NBA(ECE, EEE, MECH, CSE), NAAC with ‘A’ grade &
Permanently Affiliated to JNTU ,Kakinada)
Dakamarri, Bheemunipatnam Mandal, Visakhapatnam Dist. -531162(A.P)
Ph: +91-8922-248001, 248002 Fax: +91-8922-248011
email: principal@raghuenggcollege.com website: www.raghuenggcollege.com
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
UNIT – VI
Q. No. LONG ANSWERS QUESTION
C
O
TYPE
MARK
S
1
A
What would be the output voltage produced by a D/A
converter whose output range is 0 to 10V with a binary
numbers 10111100 (for 8-bit DAC).
6 E 6
B
What is the conversion time of a 10-bit successive
approximation ADC if its input clock is 5 MHz?
6 E 6
2
A
Calculate the conversion time for a full-scale input in
case of a 12-bit counter type analog to digital converter
driven by 2MHZ clock?
6 E 6
B Explain about weighted resistor DAC. 6 E 6
3 A
Using an op-amp draw the functional diagram of
successive approximation ADC and explain its working.
6 T 12
4 A
Determine the step-size of each step for a binary-
weighted resistor DAC if RF=1.2KΩ. What is the output
voltage when inputs from b0 through b3 are at 5V? Also
draw the circuit diagram.
6 E 12
5 A
Write a short note on performance specifications of a
analog to digital converter.
6 M 12
6 A
Draw circuit diagram and explain the 4-bit weighted
resistor type D/A converter in detail. What are the
limitations of weighted resistor type D/A converter?
6 M 12
7 A Explain the working of single slope ADC. 6 M 12
8 A Explain a R-2R Ladder type D/A converter. 6 T 12
9 A
How many comparators are required to build an n bit
flash type A/D converter? Explain about flash type ADC.
6 T 12
10 A
Explain the working of a counter type A/D converter and
state its important features.
6 T 12