Download GTU BE/B.Tech 2017 Winter 8th Sem Old 180802 Vlsi Technologies Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 8th Sem Old 180802 Vlsi Technologies Previous Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(OLD) EXAMINATION ? WINTER 2017

Subject Code: 180802 Date: 02-11-2017
Subject Name: VLSI Technologies
Time: 02:30 pm TO 5:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

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Q-1 (a) Explain the VLSI design flow by Y-chart and its simplified view 7
(b) Discuss basic steps of fabrication. 7

Q-2 (a) Explain Channel Length Modulation 7
(b) Explain energy band diagram of MOS structure at surface inversion and derive the
equation of threshold voltage.
7
OR
Q-2 (b) Derive the expression for drain current as a function of VGS, VDS and VSB for all
three region of operation of MOSFET using Gradual Channel Approximation.
7

Q-3 (a) Explain the functioning of depletion load nMOS inverter and derive critical voltage
points VOH, VOL, VIL and VIH.
7
(b) Give the delay time definitions and calculation of delay times. 7
OR
Q-3 (a) Draw two types of enhancement ? load n-MOS inverter circuits and compare both. 7
(b) Write a short note on MOSFET Capacitance. 7

Q-4 (a) Concept of regularity, modularity and locality. 7
(b) Explain Device Isolation Technique and Locos. 7
OR
Q-4 (a) Write a short note on FPGA. 7
(b) Explain CMOS Transmission gates (or Pass Gates). 7

Q-5 (a) Ad HOC testable design techniques 7
(b) Explain the basic principle of pass transistor circuit. Explain logic ?1? transfer and
logic ?0? transfer.
7
OR
Q-5 (a) Explain the criteria to measure the design quality to improve the chip design and
explain any two in brief.
7
(b) Write a short note on Built In Self Test (BIST). 7
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