JNTU
JNTU B.Tech III Year ANALOG AND DIGITAL IC APPLICATIONS Previous Question Paper (August - 2022 - R16)
Answer any five questions. All questions carry equal marks.
Main
Draw the circuit diagram of a two input non-inverting type summing amplifier and derive the expression for the output voltage.
Answer
A non-inverting summing amplifier is an operational amplifier configuration where multiple input voltages are applied to the non-inverting terminal through a resistor network, resulting in an output voltage that is proportional to the sum of the inputs.
The circuit consists of an op-amp with a feedback resistor Rf connected from the output to the inverting terminal, and a resistor R1 connected from the inverting terminal to ground. Two input voltages, V1 and V2, are connected to the non-inverting terminal via resistors R.
Applying the Superposition Theorem at the non-inverting terminal, the voltage V+ is given by:
Substituting V+ into the non-inverting gain equation:
If we choose Rf = R1, the gain becomes 2, simplifying the expression to Vout = V1 + V2, which performs the direct summation of the input signals.
Write all the ideal characteristics of op-amp.
Answer
The ideal characteristics of an operational amplifier define the theoretical performance limits used for circuit analysis:
- Infinite Open-Loop Gain (AOL = ∞): Ensures the output voltage is perfectly proportional to the differential input.
- Infinite Input Impedance (Zin = ∞): Prevents any current from flowing into the input terminals, meaning the op-amp does not load the source.
- Zero Output Impedance (Zout = 0): Allows the op-amp to drive any load without a drop in output voltage.
- Infinite Bandwidth (BW = ∞): The amplifier can process signals of any frequency with constant gain.
- Infinite Common-Mode Rejection Ratio (CMRR = ∞): The op-amp completely rejects any noise or signals common to both inputs.
- Zero Offset Voltage (Vos = 0): When both inputs are at the same potential, the output is exactly zero.
- Infinite Slew Rate: The output voltage can change instantaneously in response to input changes.
Explain the working of Non-Inverting amplifier and derive the equation of its Gain.
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How op-amp is used as a differentiator? Explain.
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Describe the operation of all pass filters.
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Determine the component values for a fourth order Butterworth HPF with fC = 15 KHz, given 2K1 = 0.765 and K2 = 1.848.
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Give the functional block diagram of VCO and explain its working and necessary expression for free running or center frequency.
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Explain the working of a Schmitt trigger with neat circuit diagram.
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With a neat diagram explain the working principle of R-2R ladder type DAC.
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Explain the working of dual slope ADC with neat circuit diagram and compare its performance with other ADC.
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Give the details of IC 1408 DAC.
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What is the percentage resolution of a 4-bit DAC given that the maximum number that can be represented using 4-bit is 15?
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Design 16×1 multiplexer using 4×1 multiplexer.
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Design a Priority encoder circuit and which 74XX series IC is used for it.
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Explain the function of synchronous DRAMs.
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Draw a basic logic diagram for a 512 × 8 – bit static RAM, showing all the inputs and outputs.
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