JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year ANALOG ELECTRONIC CIRCUITS Previous Question Paper (February - 2024 - R22)
Note: This question paper contains two parts A and B. Part-A is a compulsory question. Part-B consists of ten questions (numbered from 2 to 11) carrying 10 marks each. From each unit, there are two questions and the student should answer one of them. Hence, the student should answer five questions from Part-B.
Part A
Define cut-in voltage of a PN junction diode.
Answer
The cut-in voltage (or knee voltage) is the minimum forward bias voltage required across a PN junction diode to initiate significant current conduction, typically 0.7V for Silicon and 0.3V for Germanium.
Mention the h-parameters typical values in CE configuration.
Answer
Typical h-parameter values for a CE configuration are: hie ≈ 1.1 kΩ, hre ≈ 2.5 × 10-4, hfe ≈ 50, and hoe ≈ 25 μA/V.
Classify MOSFETs.
Answer
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Mention any 2 advantages of FET over BJT.
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Why Direct Coupled multistage amplifiers are not suitable for high frequency of operation?
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Why Class C amplifier is not suitable to use as a audio amplifier?
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What are the advantages of negative feedback amplifiers?
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What are the conditions for oscillation?
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What are the drawbacks of basic differentiator?
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Draw the pin diagram of IC741.
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Part B
Discuss the operation of clipping circuit with suitable diagram and transfer characteristics.
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Draw and explain the small signal equivalent circuit of CE.
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Explain the Input and Output Characteristics of BJT in CB Configuration.
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Draw and explain the operation of half wave rectifier and then derive the value of ripple factor.
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Define drain resistance rd, transconductance gm, amplification factor μ for a JFET. If rd=400k Ω, gm=10mA/V. Then calculate amplification factor μ.
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Describe the operation of Common Drain JFET Amplifier.
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Define Pinch-off voltage. A JFET has IDSS=32mA, VGS(off) = -8V, VGS = -4.5V. Calculate the Drain current ID.
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Explain the V-I characteristics of n-channel MOSFET in both enhancement and depleton modes.
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Compare different coupling schemes.
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What are the advantages and disadvantages of Direct Coupled multistage amplifier? Also, draw Two-stage direct coupled BJT CE amplifier.
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Explain the principle of operation of class-A power amplifier with a neat sketch.
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Define Power amplifier. Classify power amplifiers based on Conduction angle and Q-Point Location. Illustrate.
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Determine the effect of negative feedback on the input and output impedances of a Voltage-Series feedback amplifier. Show the circuit schematic diagram.
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Discuss about amplitude stability of oscillator.
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Explain the Operation of Crystal oscillator and its Applications.
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List and explain the ideal and practical characteristics of an Op-Amp.
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Define Slew Rate? A op-amp operates as a unity gain buffer with 3 V (peak to peak) sinusoidal wave input. If op-amp is ideal with slew rate 0.5 V/μsec, then calculate the maximum operating frequency of op-Amp.
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Explain the operation of square wave generator using op-Amp.
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Define Input bias current. Derive the value of compensation resistor Rcomp to be used in the op-amp circuit to get zero output voltage, when zero inputs are applied.
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