VTU Electronics and Communication Engineering (Semester 5)
Fundamentals of CMOS VLSI
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Explain with a neat diagram, enhancement mode transistor action of MOS transistor.
8 M
1 (b) Using neat diagram, describe fabrication steps for n-MOS transistor.
8 M
1 (c) Compare CMOS and Bipolar technologies.
4 M

2 (a) What do you mean by Lambda (λ) based design rule? Explain, indicate and draw design for PMOS, CMOS and n-mos.
12 M
2 (b) Using CMOS logic draw schematic and Layout diagram for Y= AB+CD .
8 M

3 (a) Explain why p-MOS and n-MOS has been used in CMOS complementary logic. Discuss CMOS complementary logic with an example.
6 M
3 (b) Describe the following logic structures with an example.
i) Pseudo-n-MOS logic
ii) Dynamic CMOS logic
10 M
3 (c) Using Bi-CMOS logic structure design a schematic circuit for h= ab+c.
4 M

4 (a) What is sheet resistance? Derive the expression for sheet resistance.
8 M
4 (b) Explain delay unit.
6 M
4 (c) Discuss the scaling factors for n-MOS transistor.
6 M

5 (a) Discuss the architectural issues of CMOS subsystem design.
4 M
5 (b) Explain combinational logic using a parity generator.
8 M
5 (c) Explain: (i) Dynamic register element (ii) Dynamic shift register
8 M

6 (a) Design and explain 4bit shifter using 4×4 cross bar and barrel shifter.
12 M
6 (b) Explain with a neat diagram 4-bit serial ? parallel multiplier.
8 M

7 (a) Explain with a neat diagram, a three transistor dynamic RAM cell.
8 M
7 (b) Explain CMOS Pseudo ? static memory cell using circuit and stick diagram.
12 M

8 (a) Discuss the floor plan and layout using 4-bit processor.
8 M
8 (b) Write a short note on
i) Built ? in ? self ? test (BIST)
ii) Scan design technology.
12 M



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