JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ANALOG AND DIGITAL ELECTRONICS Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Give the applications of PN junction diode.
Answer
A PN junction diode is primarily used as a rectifier in power supply circuits to convert alternating current (AC) into direct current (DC). Other key applications include its use as a clipping circuit for wave shaping, a clamping circuit to shift the DC level of a signal, and as a voltage regulator when operating in the reverse breakdown region (specifically for Zener diodes). Additionally, it is utilized in demodulation circuits for radio signal detection and as a protection device against reverse polarity in electronic circuits.
Discuss about diode switching times.
Answer
Diode switching time refers to the finite duration required for a diode to transition between its forward-biased (ON) and reverse-biased (OFF) states. This delay occurs because of the storage and recombination of charge carriers in the semiconductor material.
The switching process consists of two main components:
- Reverse Recovery Time (trr): When a diode is switched from forward bias to reverse bias, it does not turn off instantly. A reverse current flows momentarily due to the stored minority charge carriers in the depletion region. The time taken for this current to drop to a specified fraction of its initial value is the reverse recovery time.
- Forward Recovery Time (tfr): When a diode is switched from reverse bias to forward bias, it takes time for the minority carrier concentration to build up to the steady-state level required for full conduction. The time taken for the forward voltage drop to reach its steady-state value is the forward recovery time.
These switching times are critical in high-frequency applications, as they limit the maximum operating frequency of the diode in switching circuits.
Discuss about gain bandwidth product in amplifier using BJT.
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What is thermal runway?
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Define de morgan laws.
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Define the pinch-off voltage. Why the name field effect is used for the device FET?
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Differentiate between encoder and decoder.
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How Decimal Adder different from Binary adder?
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What is excitation table? Write the excitation tables for the SR flip flop.
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What is state assignment? Explain with a suitable example.
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Part B
Define and derive the equation for diffusion capacitance.
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Explain positive and negative diode clipper circuits.
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Briefly discuss about PN junction diode and light emitting diode.
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Discuss about half wave rectifier with and without capacitive filter.
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Explain the input and output characteristics of a transistor in CE configuration.
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Draw a Self-bias circuit and explain its operation. Derive the equation for Stability factor.
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Explain various methods used for coupling of multistage amplifiers with their frequency response.
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Draw and explain equivalent circuit of transistor at low frequencies.
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Draw the circuit diagram of common drain amplifier and derive expression for voltage Gain using FET.
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Simplify the following function and realize using universal gates F (A,B,C) = A'BC' + ABC + B'C' + A'B'
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Explain the construction and principle of operation of Enhancement mode N-channel MOSFET.
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Explain the operation of TTL with neat diagram.
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Minimise the following Boolean function using K-map and design a logic circuit using NAND gates. F=Σm (0,3,4,7,8,10,12,14)+d(2,6)
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Construct a 3*8 decoder using logic gates and its truth table.
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Express the function (xy+z)(y+xz) in canonical SOP and POS forms.
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Implement the following Boolean function with a multiplexer. F(A,B,C,D)=Σ(1, 3, 4, 11, 12, 13, 14,15)
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Draw and explain the logic diagram of 4-bit ring counter with the help of timing diagrams.
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Realize D-FF and T-FF using JK-FF.
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Explain about the universal shift registers.
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Discuss in detail about various types of ROM.
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