# Download JNTUA B.Tech 4-2 R15 2019 April Regular 15A04804 RF Integrated Circuits Question Paper

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Code: 15A04804

B.Tech IV Year II Semester (R15) Regular Examinations April 2019
RF INTEGRATED CIRCUITS
(Electronics and Communication Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Draw a series RLC tank circuit.
(b) Differentiate between series and parallel RLC networks.
(c) What is the range of reflection coefficient?
(d) A cascade of 8 identical amplifiers is connected in open circuit, each of which is single-pole with a
2 ms time constant. Find its bandwidth.
(e) For a 1 k? resistor at room temperature and a 10 kHz bandwidth, find the RMS noise voltage.
(f) Write a note on subsampling mixers.
(g) The average power delivered to the load is given as 10 W, P
in
= 2 W and P
supp
= 4 W, find the
power-added efficiency of the power amplifier.
(h) Give the average current and average slope equation of PFD/CP circuit for an input phase
difference of ? ?? ?? ???? = [ ? ?? /2 ?? ] ? ?? ?? ?? .
(i) With the phase noise ?40dBc integrated over the range of 1 kHz to 100 kHz. Give the expression to
convert it in to jitter.
(j) Mention some advantages of UMTS radio architectures.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 Derive the expression for Q factor in an RLC network with a neat diagram and necessary equations.
OR
3 What is the role of resistors, capacitors and inductors in an RF system? Explain in detail.

UNIT ? II

4 A slotted line measurement yields the following parameter values:
(i) Voltage minima at 9.2 cm and 12.4 cm measured away from the load with the line terminated in a
short.
(ii) VSWR = 5.1 with the line terminated in the unknown load; a voltage minimum is located 11.6 cm
measured away from load. What is the normalized line impedance?
OR
5 Consider an AC-coupled system to estimate the low frequency -3dB point. Calculate that how large
the coupling capacitors have to be to achieve a specified low-frequency breakpoint.

Contd. in page 2

Page 1 of 2

R15
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Code: 15A04804

B.Tech IV Year II Semester (R15) Regular Examinations April 2019
RF INTEGRATED CIRCUITS
(Electronics and Communication Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Draw a series RLC tank circuit.
(b) Differentiate between series and parallel RLC networks.
(c) What is the range of reflection coefficient?
(d) A cascade of 8 identical amplifiers is connected in open circuit, each of which is single-pole with a
2 ms time constant. Find its bandwidth.
(e) For a 1 k? resistor at room temperature and a 10 kHz bandwidth, find the RMS noise voltage.
(f) Write a note on subsampling mixers.
(g) The average power delivered to the load is given as 10 W, P
in
= 2 W and P
supp
= 4 W, find the
power-added efficiency of the power amplifier.
(h) Give the average current and average slope equation of PFD/CP circuit for an input phase
difference of ? ?? ?? ???? = [ ? ?? /2 ?? ] ? ?? ?? ?? .
(i) With the phase noise ?40dBc integrated over the range of 1 kHz to 100 kHz. Give the expression to
convert it in to jitter.
(j) Mention some advantages of UMTS radio architectures.

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 Derive the expression for Q factor in an RLC network with a neat diagram and necessary equations.
OR
3 What is the role of resistors, capacitors and inductors in an RF system? Explain in detail.

UNIT ? II

4 A slotted line measurement yields the following parameter values:
(i) Voltage minima at 9.2 cm and 12.4 cm measured away from the load with the line terminated in a
short.
(ii) VSWR = 5.1 with the line terminated in the unknown load; a voltage minimum is located 11.6 cm
measured away from load. What is the normalized line impedance?
OR
5 Consider an AC-coupled system to estimate the low frequency -3dB point. Calculate that how large
the coupling capacitors have to be to achieve a specified low-frequency breakpoint.

Contd. in page 2

Page 1 of 2

R15

Code: 15A04804

UNIT ? III

6 What are the parameters associated with intrinsic MOS noise? Explain in detail about each one of
them with necessary equations.
OR
7 Discuss the noise behavior of the following receiver in two cases shown in figure given below:
(i) ?
LO 1
is far from ?? ???? .
(ii) ?
LO 1
lies inside the band.

UNIT ? IV

8 Construct a tank consisting of lossy inductor and lossy capacitor. Determine the overall Q in terms of
the quality factor of each.
OR
9 Plot the input / output characteristic of the XOR phase detector for two cases:
(i) The circuit has a single-ended output that swings between 0 to V
DD
.
(ii) The circuit has a differential output that swings between ?V
0
and +V
0
.

UNIT ? V

10 Derive the expression for randomization and noise shaping in a fractional-N frequency
synthesizers.
OR
11 Give a brief note on the following radio architectures:
(a) Code Division Multiple Access.
(b) Universal Mobile Telecommunication System.

*****

Page 2 of 2
R15
BPF
LNA
RF
Mixer
?
IF

?
LO 1

?? ????
????
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This post was last modified on 10 September 2020