JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PULSE AND DIGITAL CIRCUITS Previous Question Paper (December - 2018 - R13)
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.
PART A
Draw the Response of Low pass RC circuit for Ramp input.
Answer
The response of a low-pass RC circuit to a ramp input (v_i = αt) is given by v_o(t) = α(t - RC + RC e^(-t/RC)). The output waveform initially follows the input with a time delay and eventually approaches a steady-state ramp shifted by the time constant RC.
Prove that Low-pass RC Circuit acts as Integrator.
Answer
For a low-pass RC circuit, the output voltage is v_o = (1/RC) ∫ v_i dt, provided the time constant RC is much larger than the input pulse duration (RC >> T). Under this condition, the capacitor voltage remains small, and the current is approximately i ≈ v_i/R. Since v_o = (1/C) ∫ i dt, substituting i yields v_o ≈ (1/RC) ∫ v_i dt, demonstrating the integration property.
Define Non-linear wave shaping.
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Draw and explain computer circuit.
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Draw practical Diode V-I characteristics.
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What is pedestal? What is its effect?
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Define Multivibrator.
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Define slope and Transmission errors.
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Define Synchronization.
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Compare logic gates and sampling gates.
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PART B
Find the Response of RLC circuit for step input.
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Discuss about Ringing Circuit.
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Derive the response of High-pass RC Circuit for pulse input for different time constants.
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Compare RC and RL circuits.
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With necessary wave forms and Transfer characteristics, explain the operation of negative clippers with out biasing.
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List the applications of voltage comparators.
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Prove that clamper is a DC restorer. List the applications of clamper.
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Discuss about synchronized clamping.
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Design a Switch with Transistor.
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List and discuss diode switch times.
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Draw four diode sampling gate and explain its operation and also derive the corresponding equations.
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With necessary circuit diagram and wave forms, explain the operation of Astable Multivibrator.
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Derive the expression for pulse width of Astable Multivibrator.
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Draw and explain Transistor Miller Time base Generator.
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What are the different methods used to improve linearity.
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Explain Astable Relaxation circuits.
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What is meant by Frequency division in sweep circuit? Explain with one example.
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Draw and explain the operation of 2-input DTL OR gate using functional Table.
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Compare different Logic families.
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