MU Electronics Engineering (Semester 8)
CMOS VLSI Design
May 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 Charge sharing and charge leakage problem of dynamic Logic circuit.
5 M
1 (b) Explain cross talk in integrated circuits.
5 M
1 (c) Explain EEPROM using floating gate NMOSFETS.
5 M
1 (d) Compare clock skew and jitter.
5 M

2 (a) What is effect of interconnect parasitic on delay? How delay can be reduced? What is Elmore delay model?
10 M
2 (b) Give and explain signal phase clock system and explain its drawback.
10 M

3 (a) Implement 4 bit adder using Carry Look Ahead (CLA) principle.
10 M
3 (b) State the need of input and output circuit. Explain with neat diagram the schematic and design considerations for the same.
10 M

4 (a) Explain frequency compensation in operational amplifier.
10 M
4 (b) Implement the following function using NOR-NOR implementation for a PLA.
F1=abc+a'b'c'
F2=a'c'=a'b
F3=ab'+ac
10 M

5 (a) What are the different clock generation schemes employed in VLSI systems. Discuss 'H' tree clock distribution in high density CMOS circuits.
10 M
5 (b) Draw schematic for 6T SRAM cell and explain its stability criteria. Also draw and discuss its butterfly curve.
10 M

6 (a) Draw 4×4 NOR based ROM array circuitry stored following data 1011, 1001, 0101, 0011.
10 M
6 (b) Give and explain the maximum and minimum frequency calculation of clock signal which determine the data transfer rate through cascade system.
10 M

Write short notes on any three:
7 (a) Low power design consideration.
7 M
7 (b) Carry skip adder.
7 M
7 (c) Interconnect scaling.
7 M
7 (d) Switched capacitor circuit.
7 M



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