JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELECTRONIC CIRCUIT ANALYSIS Previous Question Paper (May - 2019 - R15)
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 the concept of Miller’s Theorem related to amplifiers.
Answer
Miller's Theorem states that a floating impedance Z connected between two nodes with a voltage gain A can be replaced by two grounded impedances Z1 = Z / (1 - A) and Z2 = Z / (1 - 1/A) connected at the input and output nodes respectively, simplifying the analysis of feedback and input capacitance in amplifiers.
What is Cas-code Amplifier?
Answer
A Cascode amplifier is a two-stage amplifier configuration consisting of a common-emitter stage followed by a common-base stage. This arrangement provides high input impedance, high output impedance, and high voltage gain while significantly reducing the Miller effect, which improves high-frequency performance.
Draw the Frequency response of BJT Amplifier.
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List out the General frequency considerations of BJT amplifier.
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What is the concept of Positive and Negative Feedback.
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List out the Different Classification of Oscillators.
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Write different Classification of Large signal amplifiers.
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What are the advantages if Heat sinks are used in amplifiers?
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What is the expression for harmonic distortion in tuned amplifiers?
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How to achieve stability in tuned amplifiers?
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Part B
What are the different types of distortions present in Amplifiers? Why they occur in it.
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Explain the concept of Analysis of CE amplifier with Emitter follower along with circuit diagram.
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Derive the Analysis of Cascaded RC Coupled BJT amplifiers along with circuit diagram.
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Draw the circuit diagram of Direct Coupled Amplifier and explain its operation in detail.
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Derive an expression for Voltage gain, input resistance, output resistance of a source follower at high frequencies.
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Draw the circuit diagram of Common Emitter Transistor Π Model and explain its operation.
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Explain the following terms in detail:
i) CE Short Circuit Current Gain
ii) Current Gain with Resistive Load.
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Explain the significance of the gain bandwidth product.
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Derive the expression for frequency of oscillation and condition for sustained oscillation of a Hartley oscillator.
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Explain the limitations of RC phase shift oscillator in detail.
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Draw Wien bridge oscillator using BJT and show that the gain must be at least 3 for the oscillations to occur.
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Draw the circuit diagram of Current Shunt Feedback amplifier and explain its operation.
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Explain the operation of a class-A power amplifier with necessary diagram.
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A signal ib=Im cos ωt is applied to a power amplifier with second order nonlinearity between ib and ic. Derive the expression for iC and also derive distortion factor.
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Explain the operation of a class B push-pull power amplifier and list out its Advantages and disadvantages.
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Explain the operation of a complementary and symmetry class B push pull amplifier with necessary diagram.
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Explain the operation of a single tuned amplifier circuit and its frequency Response.
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Show that for an “n” stage synchronously tuned amplifier, maximum, bandwidth is achieved, if the single stage gain is 4.34 dB.
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What are the different effects of Cascading Double Tuned Amplifiers on Bandwidth in detail.
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What are the different types of Tuned Amplifiers and explain various areas of applications?
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