JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELECTRONIC CIRCUITS Previous Question Paper (November/December - 2018 - R16)
Part A is compulsory (25 Marks). Part B consists of 5 Units. Answer any one full question from each unit (10 Marks each).
Part A
Write the effect of Distortion in Amplifier circuits.
Answer
Distortion in amplifier circuits causes the output signal to deviate from the original input signal waveform. This results in the loss of signal fidelity, the introduction of unwanted harmonics (non-linear distortion), and potential frequency-dependent amplitude or phase errors (linear distortion), which degrade the quality of the amplified signal.
Illustrate frequency response of BJT Amplifier.
Answer
The frequency response of a BJT amplifier is a plot of gain versus frequency. It typically shows a mid-band region where gain is constant, flanked by low-frequency roll-off (due to coupling and bypass capacitors) and high-frequency roll-off (due to internal transistor junction capacitances and stray capacitances).
Write the condition for oscillations and its sustenance.
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How does negative feedback effect the input and output resistances?
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Mention the achievable Maximum Efficiency of Class - A Amplifier.
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Write about the concept of Thermal Runway and its counter measures.
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What is a negative peak clamper?
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Discuss in brief about Clipping at Two Independent Levels.
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List the Transistor Switching Times.
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Distinguish between bistable, monostable and astable mutivibrators.
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Part B
Discuss the variation of AI, AV, Ri, and Ro with RS and RL in Common Emitter configuration.
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Discuss the significance of Miller’s theorem in transistor circuit analysis.
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Design and explain the circuit diagram of Common Emitter amplifier and then derive an expression for the Voltage gain, current gain, Input Impedance and output Impedance.
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Draw the circuit diagram of a current series feedback and derive expressions for Voltage gain, output resistance and input resistance.
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Derive the condition for sustaining the oscillations for a Colpitts Oscillator and also frequency of oscillators.
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Explain the operation of a complimentary symmetry class-B power amplifier.
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Write the methods to avoid the cross over distortion in power amplifiers circuit.
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Mention about the Phase Inverters and their applications in brief.
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Discuss the requirements of heat sink and there types for large signal amplifiers.
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Discuss about the practical Clamping using Diode with different inputs.
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Draw the basic circuit diagram of a DC restorer circuit and explain its operation.
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Explain the circuit diagram of an emitter-coupled clipping circuit with its Characteristics.
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Draw the RC high pass circuit and explain its working with step voltage input.
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Explain the operation of a diode as a switch and discuss its piece wise linear Characteristics.
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Write a note on the breakdown Voltage Consideration of Transistor.
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Draw and explain the operation of Schmitt Trigger with its waveforms and derive the expression for pulse width.
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