JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III LINEAR IC APPLICATIONS Previous Question Paper (November/December - 2017 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Define differential amplifier.
Answer
A differential amplifier is an electronic amplifier that amplifies the difference between two input voltages while suppressing any voltage common to both inputs.
What is CMRR?
Answer
CMRR (Common Mode Rejection Ratio) is the ratio of the differential voltage gain to the common-mode voltage gain. It is a measure of an amplifier's ability to reject common-mode signals, typically expressed in decibels (dB) as
Draw the Schmitt trigger block diagram.
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Define Regulation of Voltage regulator.
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Define Pass band.
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Draw the narrow band reject filter.
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List out the applications of monostable multivibrator.
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What is Capture range in PLL?
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List out the specifications of DAC.
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Draw the block diagram for dual slope ADC.
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Unit I
Define CMRR. Explain about measurement of CMRR using OP Amps.
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The CMRR of an OP-Amp is 104. Two sets of signals are applied to it. First set is V1 = ± 20 μV and V2 = –20 μV and second set is V1 = 540 μV and V2 = 500 μV. Calculate the percentage difference in output voltage for the two sets of signals.
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Derive the expression for output offset voltage.
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Define thermal drift. Explain how it will affect the output voltage of an OP-Amp.
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Unit II
Design a practical integrator circuit to integrate a sinusoidal input of 10 mV and upto 1 KHz.
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Mention some applications of Integrator.
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Draw the frequency response of practical differentiator and Explain.
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Design a differentiator that will differentiate an input signal with fmax =100 Hz.
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Unit III
Derive the expression for transfer function of second order band pass filter.
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Draw the wave forms of Narrow band pass filter and wide band pass filter and compare them.
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Write the difference between notch filter and band pass filter with suitable diagrams.
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Write about classification of filters and mention the advantages of active filters over passive filters.
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Unit IV
The 555 timer is used in the free running mode of operation with RA = 10 kΩ, RB = 22kΩ & C = 10μF. The timer has a +15 V volt supply. Calculate the output frequency and duty cycle.
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Write about tone-burst oscillator using 555 timer.
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Write about voltage controlled frequency shifter using 555 timer.
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In 555 timer base astable multivibrator, if RA = RB = 10 kΩ and C = 0.1 μF. Find: (i) thigh (ii) tlow (iii) frequency of oscillation.
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Unit V
Describe about the counter type ADC.
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Explain about the parallel comparator type ADC.
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With a neat diagram explain about the weighted resistor DAC.
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Write about the IC 1408 DAC.
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