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The document outlines a series of tasks related to CMOS logic design, including the implementation of multiplexers, inverters, and various logic functions using both pass transistor and transmission gate logic. It also covers the characteristics, advantages, and power dissipation aspects of CMOS circuits. Additionally, it includes theoretical explanations and derivations related to switching thresholds and voltage transfer characteristics.

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Roy Sathyadevan
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8 views2 pages

Vlsi

The document outlines a series of tasks related to CMOS logic design, including the implementation of multiplexers, inverters, and various logic functions using both pass transistor and transmission gate logic. It also covers the characteristics, advantages, and power dissipation aspects of CMOS circuits. Additionally, it includes theoretical explanations and derivations related to switching thresholds and voltage transfer characteristics.

Uploaded by

Roy Sathyadevan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Module 2

1. Design a 2x1 multiplexer using CMOS logic (3)


2. Draw the circuit of a MOS inverter with saturated NMOS load(3)
3. Illustrate CMOS inverter DC characteristics with neat diagrams. Explain the different regions
4. Implement the 4x1 multiplexer using Transmission gates
5. What is meant by pass transistor logic? What are the differences in transmission
characteristics of N MOS and P MOS transistors?
6. Realize the logic function X= ((A+B).(C+D))’ using CMOS logic
7. Implement AND function using NMOS logic (3)
8. What are the advantages of CMOS logic (3)
9. Describe in detail about pass transistor and transmission gate logic
10. Implement the following using Transmission gates
i) NAND ii) NOR iii) XOR
11. Realize the logic functions using CMOS logic
(i) X= ((A.B)+(C.D))’
(ii) Y= (A.(B+C.D))
12. Explain switching power dissipations in CMOS logic
13. How can you implement (A(B+C))’ using static CMOS logic? (3)
14. Explain the implementation of a 2:1 multiplexer using transmission gate logic.(3)
15. From the VI characteristics of NMOS and PMOS transistors, how can you graphically arrive at
the VTC of a CMOS inverter? Show the different regions of operation of CMOS inverter in the
VTC.
16. Explain the working of a pass transistor.
17. Derive the expression for switching threshold of a CMOS inverter.
18. What are the factors that affect the static and dynamic power dissipations in a CMOS circuit?
Discuss the total power dissipation with proper equations and derivations.
19. What are transmission gates? State the advantages of transmission gates. (3)
20. Draw and explain a CMOS inverter (3)
21. Why PMOS transistor can pass only strong ones and NMOS can pass strong zeros?
22. Draw the static CMOS logic circuit for the following operations

23. a) Derive expression for the switching threshold of a CMOS inverter. (7)
24. b) Implement a 2:1 MUX using pass transistor logic and transmission gate logic. (7)
25. With relevant waveforms, define propagation delay times in a CMOS circuit. (3)
26. Realize two-input OR/NOR gates using complementary pass transistor logic. (3)
27. Plot the Voltage transfer characteristics of a static CMOS inverter and label the
details. Derive the equation for the switching threshold.
28. Realize the following logic functions

29. Design a 3-input XOR gate using


a) Pass transistor logic b) Transmission gate logic
30. Why PMOS transistor can pass only strong ones and NMOS can pass strong
zeros? Explain.

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