JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III LINEAR AND DIGITAL IC APPLICATIONS Previous Question Paper (August - 2022 - R16)
Answer any five questions. All questions carry equal marks.
Main
Explain the working of non-inverting amplifier and derive the equation of its Gain.
Answer
A non-inverting amplifier uses an op-amp where the input signal is applied directly to the non-inverting (+) terminal. A feedback network consisting of resistors Rf and R1 is connected from the output to the inverting (-) terminal, creating a closed-loop configuration.
Because of the virtual ground concept and negative feedback, the voltage at the inverting terminal (V-) equals the input voltage (Vin). The current through R1 is I = Vin / R1. Since no current flows into the op-amp input terminals, this same current flows through Rf.
Factoring out Vin, we get the gain (Av):
How op-amp is used as a differentiator? Explain.
Answer
An op-amp differentiator produces an output voltage proportional to the rate of change of the input voltage. It is constructed by placing a capacitor (C) at the input terminal and a resistor (Rf) in the feedback path.
The current through the capacitor is given by I = C(dVin/dt). Since the inverting terminal is at virtual ground, the current through the feedback resistor is I = -Vout / Rf. Equating these currents gives:
The output is the negative derivative of the input signal, scaled by the time constant RfC. It is commonly used in wave-shaping circuits to detect high-frequency components or slope changes in a signal.
List and explain the characteristics of three terminal IC regulator.
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Define closed loop gain and open loop gain. What are different modes of operation, explain with a diagram.
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What is the function of IC voltage regulator? Show the standard representation of IC voltage regulator.
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Explain the function of op-amp integrator circuit with input-output wave forms.
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Design an active high pass filter with cutoff frequency of 4KHz.
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How to generate a sawtooth wave form? Explain the working of such a circuit with neat diagram.
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List the application of 565 PLL.
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Design monostable multivibrator using 555 Timer to produce a pulse width of 100 msec.
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Draw the block diagram of 565 PLL and explain about each block. Explain tracking range and capture range of a PLL.
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List the advantages of active filters over passive filters.
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Draw the inverted R/2R ladder D/A Converter in current steering mode and derive expression for output voltage.
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Draw the functional diagram of a dual slope integrating type ADC and also obtain expression for the output voltage.
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What would be the output voltage produced by a D/A converter whose output range is 0 to 10V with a binary number 10111100 (for a 8 bit DAC).
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Define important performance specifications of Analog to digital converters and list their typical values.
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Find the voltage at all nodes 0, 1, 2 … and at the output of a 5-bit R-2R ladder DAC. The LSB is 1 and all other bits are equal to ‘0’. Assume VR = -10V and R = 10 kΩ
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Design a driving circuit for LED and which 74XX series IC is used for it.
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Design a Priority encoder circuit and which 74XX series IC is used for it.
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Design a decode counter using Jk-Flip-Flops.
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Describe RAM Architecture and write its applications.
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