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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