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Code: 15A04804
B.Tech IV Year II Semester (R15) Regular Examinations April 2019
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RF INTEGRATED CIRCUITS
(Electronics and Communication Engineering)
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Time: 3 hours Max. Marks: 70
PART - A
(Compulsory Question)
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1 Answer the following: (10 X 02 = 20 Marks)
(a) Draw a series RLC tank circuit.
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(b) What is the range of reflection coefficient?
(c) Differentiate between series and parallel RLC networks.
(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.
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(e) For a 1 ?O resistor at room temperature and a 10 kHz bandwidth, find the RMS noise voltage.
(f) Write a note on subsampling mixers.
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(g) The average power delivered to the load is given as 10 W, Pin = 2 W and Psupp = 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 Af rad = [?f/2p] × Tin·
(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.
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(j) Mention some advantages of UMTS radio architectures.
PART - B
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(Answer all five units, 5 X 10 = 50 Marks)
UNIT-1
2 Derive the expression for Q factor in an RLC network with a neat diagram and necessary equations.
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OR
3 What is the role of resistors, capacitors and inductors in an RF system? Explain in detail.
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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.
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(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
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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.
UNIT - III
6 What are the parameters associated with intrinsic MOS noise? Explain in detail about each one of them with necessary equations.
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OR
7 Discuss the noise behavior of the following receiver in two cases shown in figure given below:
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(i) @L01 is far from WRF.
(ii) WL01 lies inside the band.
LNA RF Mixer WIF BPF WRF LO WL01
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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.
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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 VDD.
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(ii) The circuit has a differential output that swings between -Vo and +Vo.
UNIT - V
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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:
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(a) Code Division Multiple Access.
(b) Universal Mobile Telecommunication System.
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