JNTU
JNTU B.Tech IV ANALOG CMOS IC DESIGN Previous Question Paper (July - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the various models to represent a MOS transistor?
Answer
The MOS transistor is represented by the following models: the large-signal model (I-V characteristics), the small-signal model (linearized equivalent circuit for AC analysis), and the high-frequency model (including parasitic capacitances).
Draw the small signal model of MOS Transistor.
Answer
The small-signal model consists of a voltage-controlled current source gmVgs connected between drain and source, with an output resistance ro in parallel, and gate-to-source capacitance Cgs and gate-to-drain capacitance Cgd.
What is mean by current sink?
Answer
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Draw the circuit diagram of MOS Cascode current mirror.
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What is an active load amplifier?
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What are the advantage of Cascode amplifier? Where it is used?
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Why compensation is needed in op-amp?
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Explain the charge injection error and why it is occur?
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List the important characteristics of a comparator.
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Define propagation time delay in comparator.
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Part B
Explain the Large-signal model for the MOS Transistor.
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Explain about the computer simulation models.
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Explain about the CMOS device Modeling.
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With the help of required expressions explain Sub-threshold MOS Model.
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Discuss about current and voltage references in detail with suitable diagrams.
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What is beta helper? How is it used in current mirrors?
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Draw and explain the circuit diagram of cascade current mirror.
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Write a short notes on current sources with neat circuit diagram.
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Design a differential amplifier using CMOS transistors and explain its working.
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Discuss the CMOS inverter in detail with the explanation of VTC.
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Design a CMOS current mirror load differential amplifier.
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Explain the slew rate and noise for p-channel differential amplifier with necessary equations.
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With neat sketch and necessary equations explain the concept of nulling resistor compensation of two stage CMOS Op-Amp.
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List various compensation techniques of Op-Amps, explain feed forward compensation.
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Build the circuit model and frequency response of two stage comparator.
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How to improve the performance of Open loop comparator? Explain.
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