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Code: 15A04804

B.Tech IV Year II Semester (R15) Advanced Supplementary Examinations July 2019

RF INTEGRATED CIRCUITS

(Electronics & Communication Engineering)

Time: 3 hours Max. Marks: 70

PART ? A

(Compulsory Question)

*****

1 Answer the following: (10 X 02 = 20 Marks)

(a) Calculate the resonant frequency of a parallel RLC tank, given L = 1 nH, C = 1 pF.

(b) State skin effect.

(c) Write the wave equation in one space dimension.

(d) In an open-circuit time constant if R

1

= R

2

= 10 k ? and C

1

= C

2

= 100 pF, what are the pole

frequencies?

(e) Having the noise factor, F = SNR

i

/ SNR

o

give the expression to find noise figure.

(f) Differentiate between power match and noise match.

(g) In a VCO if CM change at X and Y is indistinguishable from a change in V

cont

, then what will be the

change in the oscillation frequency?

(h) While constructing a charge-pump PLL using PFD/CP, the loop ideally forces the input phase error

to zero. Justify your answer.

(i) Define fractional frequency.

(j) List out some advantages of GSM radio architectures.

PART ? B

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

UNIT ? I

2 Draw the phasor diagram for a parallel RLC circuit. And derive the expression for impedance and

current triangle of the circuit.

OR

3 (a) Differentiate between Pi match and T match.

(b) Why does the skin effect occur? Mention the factors affecting skin effect in a conductor carrying

a.c current.

UNIT ? II

4 An air-filled 50 ? coaxial line has a loaded VSWR of 3.3 at a frequency of 3 GHz. Replacing the load

with a short cause the voltage minimum to move 1.0 cm towards the generator. What is the

normalized load impedance?

OR

Contd. in page 2

Page 1 of 2

R15

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Code: 15A04804

B.Tech IV Year II Semester (R15) Advanced Supplementary Examinations July 2019

RF INTEGRATED CIRCUITS

(Electronics & Communication Engineering)

Time: 3 hours Max. Marks: 70

PART ? A

(Compulsory Question)

*****

1 Answer the following: (10 X 02 = 20 Marks)

(a) Calculate the resonant frequency of a parallel RLC tank, given L = 1 nH, C = 1 pF.

(b) State skin effect.

(c) Write the wave equation in one space dimension.

(d) In an open-circuit time constant if R

1

= R

2

= 10 k ? and C

1

= C

2

= 100 pF, what are the pole

frequencies?

(e) Having the noise factor, F = SNR

i

/ SNR

o

give the expression to find noise figure.

(f) Differentiate between power match and noise match.

(g) In a VCO if CM change at X and Y is indistinguishable from a change in V

cont

, then what will be the

change in the oscillation frequency?

(h) While constructing a charge-pump PLL using PFD/CP, the loop ideally forces the input phase error

to zero. Justify your answer.

(i) Define fractional frequency.

(j) List out some advantages of GSM radio architectures.

PART ? B

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

UNIT ? I

2 Draw the phasor diagram for a parallel RLC circuit. And derive the expression for impedance and

current triangle of the circuit.

OR

3 (a) Differentiate between Pi match and T match.

(b) Why does the skin effect occur? Mention the factors affecting skin effect in a conductor carrying

a.c current.

UNIT ? II

4 An air-filled 50 ? coaxial line has a loaded VSWR of 3.3 at a frequency of 3 GHz. Replacing the load

with a short cause the voltage minimum to move 1.0 cm towards the generator. What is the

normalized load impedance?

OR

Contd. in page 2

Page 1 of 2

R15

Code: 15A04804

5 In the folded cascade circuit shown in figure below, all transistors have the same ?C

ox

(W/L), the

same ? and I

D2

= 2I

D1

. Find the gain and the output resistance of the amplifier (in terms of g

m1

and r

01

only).

UNIT ? III

6 Lay out an LNA and connect its input to a pad through a metal line with the length of 200 ?m and

width of 0.5 ?m. By assuming a noise figure of 2dB for the LNA and a sheet resistance of about

40 m ? for the metal line determine the overall noise figure. Neglect the input-referred noise current

of the LNA.

OR

7 Which device is used to convert baseband signal or IF frequency to a higher IF or RF frequency for

efficient transmission in transmitters? Explain its operation in detail.

UNIT ? IV

8 Which amplifier operates linearly across the full input and output range while the transistors remain

ON? Explain in detail with necessary equations.

OR

9 (a) Write a brief note on resonators.

(b) If the input frequency changes by ? ?, how much is the change in the phase error? Assume the loop

remains lock.

UNIT ? V

10 (a) During synthesizer settling, the power amplifier in a transmitter is turned OFF. Explain why?

(b) Compute the required reference frequency and range of divide ratios for an integer-N synthesizer

designed for a Bluetooth receiver for direct conversion and sliding-IF down conversion with

f

LO

=(2/3) f

RF

.

OR

11 Explain in detail about GSM radio architectures and list out its advantages and disadvantages.

*****

Page 2 of 2

R15

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This post was last modified on 10 September 2020