JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech II ANALOG CIRCUITS Previous Question Paper (February - 2024 - R22)
Note: This question paper contains two parts A and B. Part-A is compulsory. Part-B consists of five questions to be answered selecting one from each unit.
Part A
Answer the following sub-questions:
Define DC load line in transistor biasing.
Answer
The DC load line is a straight line drawn on the output characteristics of a transistor (e.g., IC vs VCE) that represents all possible combinations of collector current and collector-emitter voltage for a given DC biasing circuit. It is defined by the equation:
What is the low-frequency response of BJT amplifiers primarily influenced by?
Answer
The low-frequency response of BJT amplifiers is primarily influenced by the coupling capacitors (blocking capacitors) and bypass capacitors. At low frequencies, the reactance of these capacitors increases, leading to significant signal attenuation and phase shift.
What is the purpose of biasing in FET circuits?
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What is the primary advantage of the source follower configuration?
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Define various coupling methods.
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Classify the amplifiers.
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Define the loop gain or return ratio.
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Define degenerative feedback.
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Draw the equivalent circuit of crystal.
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How does an oscillator differ from an amplifier?
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Part B
Explain the need for bias compensation and fixed bias circuit.
Explain the need for bias compensation in transistor circuits.
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Draw the fixed bias circuit and explain it. Write the draw backs of it.
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Determine the amplifier parameters for CC configuration given h-parameters and circuit components.
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Discuss the self-bias circuit and derive the expression for stability factor S.
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Differentiate between a BJT amplifier and FET amplifier.
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Write the advantages and disadvantages of using JFETs and BJTs in different amplifier configurations.
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With neat sketch, discuss about common source JFET amplifier.
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Derive the equation for voltage gain of a common source JFET amplifier.
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Draw and explain the operation of Darlington amplifier and derive equation for its input impedance.
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Define unity gain frequency. Obtain the necessary relation using transistor frequency response.
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Draw the circuit of a Two stage RC-Coupled Amplifier and explain its working along with its advantages.
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Draw the circuit for Voltage series feedback amplifier and justify the type of feedback.
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Calculate the loop gain and feedback factor given input resistances and gain changes.
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Show that the bandwidth increases in negative feedback amplifiers.
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Draw and explain the block diagram of voltage shunt feedback amplifier.
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Obtain the expression for frequency of oscillations and condition of oscillations for RC Phase- shift oscillator.
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Derive the expression for the frequency of colpitt’s oscillators.
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How does the frequency stability of an LC oscillator depend upon the Q-factor of the LC circuit? Explain.
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