JNTU
JNTU B.Tech III LINEAR AND DIGITAL IC APPLICATIONS Previous Question Paper (November/December - 2018 - R16)
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
Define the Op-Amp parameters: (i) Input offset voltage (Vio) and (ii) Input bias current, Iio.
Answer
(i) Input offset voltage (Vio) is the differential DC voltage required between the two input terminals of an operational amplifier to force the output voltage to zero when the inputs are grounded.
(ii) Input bias current (Ib) is the average of the two currents flowing into the inverting and non-inverting input terminals of the op-amp, defined as Ib = (Ib1 + Ib2) / 2. It represents the DC current required to bias the internal transistors of the input stage.
Discuss the features of voltage regulator.
Answer
A voltage regulator is a circuit designed to maintain a constant output voltage regardless of changes in input voltage or load conditions. Its key features include:
- Line Regulation: The ability of the regulator to maintain a constant output voltage despite variations in the input supply voltage.
- Load Regulation: The ability to maintain a constant output voltage even when the load current changes, ensuring stability under varying demand.
- Protection Features: Modern regulators often include internal circuitry for thermal shutdown, current limiting, and short-circuit protection to prevent damage to the device or the load.
- Low Output Impedance: Regulators exhibit very low output impedance, which allows them to act as ideal voltage sources that do not drop voltage significantly when current is drawn.
List out the application of 555 timer.
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Differentiate between active and passive filters.
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Give the conversion time for: (i) Counting ADC and (ii) successive approximation ADC.
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What are the disadvantages and advantages of weighted resister DAC?
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Classify the bipolar logic family by operation and give examples for each category.
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Draw the circuit of Totem-pole TTL NAND gate.
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Compare between SRAM and DRAM.
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Design a 8-bit parallel-in and serial-out shift register.
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Part B
How an op-amp is used as a differentiator? Explain.
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Explain the following terms: (i) Slew Rate. (ii) CMRR.
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With neat pin diagram, explain about 78xx series regulator.
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The IC 741 is connected as a non-inverting amplifier for a gain of 100. Determine the stability of the amplifier at this gain.
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Draw the circuit of an Astable multivibrator using 555 IC Timer and derive the expression for its frequency of oscillations.
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Why is capture range always smaller than the lock in range? Explain.
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Explain the operation of IC555 timer in monostable mode. Also mention its applications.
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An 8-bit ADC is capable of accepting an input unipolar voltage 0 to 10 V. Find the minimum value of 1LSB and the digital output code if the input is 5.4V.
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Explain the working of 3-bit D to A converter using R-2R ladder network.
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Explain the working of A to D converter using successive approximation method.
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The logic levels for an 8-bit R-2R ladder type DAC are logic '1' = +5 V and logic '0' = 0V. Find the output voltage for an input of 10110111.
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Design a 4 to 16 decoder using two 74X138 IC’s.
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Compare CMOS, TTL and ECL with reference to logic levels, DC noise margin, propagation delay and fan-out.
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Design a two bit comparator circuit and explain its operation.
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Design the Binary to Gray code converter and explain its procedure in detail.
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With the help of timing waveforms, explain read and write operations of SRAM.
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Explain the necessity of two-dimensional decoding mechanism in memories. Draw MOS transistor memory cell in ROM and explain the operation.
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Explain different types of shift registers.
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Explain the internal structure of a 128X1 ROM using two dimensional decoding.
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