JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III SIGNAL CONDITIONING CIRCUITS 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. Each question carries 10 marks.
Part A
Draw AC coupled Voltage divider for Dynamic measurements.
Answer
An AC coupled voltage divider consists of a DC source connected to a voltage divider network (R1 and R2), where the output is taken through a series capacitor (C) to block the DC component and pass only the dynamic (AC) signal variations.
Draw the Instrumentation amplifier circuit using three amplifiers.
Answer
The three-amplifier instrumentation amplifier consists of two input buffer amplifiers (non-inverting) followed by a differential amplifier stage. It provides high input impedance and high common-mode rejection ratio (CMRR).
Draw the Structure of carrier amplifier.
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Explain the operation of a phase detectors based on zero-crossing.
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A carbon film resistor has 100 KΩ and has 1.6 µV/V excess noise and it works in circuit at 500 C. Calculate its voltage noise from 0.1 to 10KHz.
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Derive a relation for noise bandwidth.
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Explain the principle of period meter.
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How the digital Quartz thermometer works? Explain briefly.
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What are the applications of ultra sonic based sensors?
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Explain the function of photodiode.
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Part B
Derive a relation for output voltage of linear Temperature dependent voltage divider based on an NTC thermistor.
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Describe different detection methods used for Wheatstone bridges.
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Explain about Sensor bridge calibration and balance.
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Write a short note on sensitivity and linearity of Wheatstone bridge.
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How could you provide LVDT signal conditioning based on phase sensitive demodulation? Explain.
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Draw a circuit to convert angles in synchro into angles in resolver and explain.
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Draw capacitive pseudo bridges for single and differential capacitive sensors and explain them with output voltage relations.
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Explain the working of Resolver to digital converters with a sketch.
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Describe the cautions in designing electrometer circuits.
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A piezoelectric hydrophone has a sensitivity of 0.5pC/Pa and equivalent capacitance of 10nF. Design a charge amplifier with -3dB bandwidth from 10 Hz to 10 KHz and sensitivity -1mV/Pa, including a protection resistor in series with the op-amp inverting input.
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What is the need of a Composite amplifier? And explain working of Composite amplifier.
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Explain the operation of ideal charge amplifier and describe the sources of zeros error in real charge amplifier.
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Explain the voltage to frequency conversion based on the charge balancing technique with a sketch.
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Explain about basic architecture of a network independent sensor compatible with IEEE standard.
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Explain the working of Relaxation CMOS oscillator with circuit and waveforms.
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Explain the strain to frequency conversion based on a differential integration and a voltage comparison with a sketch.
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Draw the block diagram of a CCD line image sensor and mention its applications.
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How the position sensitive detector work? Explain.
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Explain the principles of extrinsic fiber optic sensors.
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Compare magneto diodes and magneto transistors.
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