JNTU
JNTU B.Tech III LINEAR IC APPLICATIONS Previous Question Paper (November/December - 2018 - 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 and may have a, b, c as sub questions.
Part A
What is an level translator? Why is it used?
Answer
A level translator is an electronic circuit designed to shift the DC voltage level of a signal from one reference point to another without altering the signal's information or waveform. It is primarily used in multistage direct-coupled amplifiers, such as operational amplifiers, to prevent the accumulation of DC bias levels across successive stages. By shifting the output of one stage back to a level suitable for the input of the next, it ensures that transistors remain in their active operating region and prevents signal clipping or saturation.
Give the schematic symbol of op amp? And discuss the role of each terminal.
Answer
The schematic symbol of an operational amplifier is a triangle with two input terminals on the left and one output terminal on the right. The top input is marked with a plus sign (+) representing the non-inverting input, and the bottom input is marked with a minus sign (-) representing the inverting input.
The role of each terminal is as follows:
- Non-inverting input (+): A signal applied here produces an output signal in phase with the input.
- Inverting input (-): A signal applied here produces an output signal 180 degrees out of phase with the input.
- Output terminal: Provides the amplified signal, which is proportional to the difference between the voltages at the two input terminals.
- Power supply terminals (V+ and V-): These terminals provide the necessary DC power to the internal circuitry of the op-amp to enable amplification.
What is an voltage regulator? Discuss the types of voltage regulators.
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Discuss the features and applications of instrumentation amplifier.
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What is the difference between sawtooth and triangular wave? Discuss.
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For an all pass filter, determine the phase shift between input and output at f=2KHz. Choose R= 15.9KΩ and C = 0.01μF.
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What factors determine the lock range and capture range.
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List the features of 555 timer.
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Define resolution and quantization error.
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The basic step of a 6 bit DAC is 10 mv. If 000000 represents 0V, what output is produced if the input is 101101?
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Unit I
Discuss the AC characteristics of an op-amp in detail.
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What is the difference between ideal and practical op-amp? Discuss.
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Obtain voltage gain for the practical non inverting and inverting amplifier.
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Discuss the need of current mirror circuit in difference amplifier.
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Unit II
Design an op-amp differentiator to differentiate signals with fmax=200Hz. Draw the output waveform for a sine wave of 1V peak at 100Hz. The gain at 10Hz should be 0.1. What will be the output if the input is square wave?
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Explain how comparator is used as level detector.
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Explain in detail how the op-amp is used as V-I and I-V converter with neat circuit diagrams.
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Unit III
Design and obtain the frequency response of a band pass filter with fL=400Hz and fH=1 KHz with pass band gain 1.
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Compare the RC phase shift and wein bridge oscillator.
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Explain the quadrature oscillator in detail.
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Explain the operation of the second order low pass Butterworth filter.
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Unit IV
Design a mono stable multivibrator using 555 timer to get a pulse width of 0.1 msec. draw the circuit and waveforms.
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Discuss the monolithic PLL’s.
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Explain the application of astable multivibrator as a free running ramp generator.
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Draw the block diagram of VCO 566 and explain each block.
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Unit V
Explain the R-2R ladder type DAC and compare with Weighted DAC.
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Discuss the use of V/F converter in LED temperature indicator.
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Draw the block diagram of a appliance timer and explain its operation.
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Compare the conversion time for integrating ADC, flash comparator ADC and successive approximation ADC.
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