UNIV4VINU | ENGINEERING ACHIEVERS

BE/B.TECH. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2008.

Seventh Semester

Electronics and Communication Engineering

EC-1401-VLSI DESIGN

(Regulation 2004)

PART-A-(10*2=20 marks)

1.How do you prevent Latch up problem?

2.List any two types of layout design rules.

3.Define rise time and fall time.

4.Write an expression for power dissipation in CMOS inverter.

5.Differentiate between conditional and procedural assignment.

6.Why do you require sensitivity list?

7.Draw 2:1 Mux using Transmission gate.

8.What are the different types of programming structure available in PAL?

9.What are the different types of CMOS testing?

10.List any two faults that occur during manufacturing.

PART-B----(5*16=80)

11.a) Explain with neat diagram the SOI process and mention its advantages.

Or

b) (i) How are the circuit elements implemented in IC’s? (8)

(ii) Explain about CMOS interconnects with diagram. (8)

12. a) (i) Derive the expression for Dc characteristics of CMOS inverter (8)

(ii) Explain the small signal AC characteristics of MOS transistor (8)

Or

b) (i) Derive the equation for threshold voltage of a MOS transistor and threshold voltage

in terms of Flat band voltage. (10)

(ii) Calculate the threshold voltage for a transistor at 300K for a process with a Si

substrate with NA-1.80´1016, a Sio2 gate oxide with thickness 200Å.Assume

fms=-0.9V;Qfc=0. (6)

13. (a) (i) Write a Verilog program for 3 to 8 decoder in gate level description. (12)

(ii) What are the differences between behavioral and RTL modeling?(4)

Or

b) Write a Verilog program for 8 bits full adder using one bit full adder. The one bit full

adder should be written in behavioral modeling.

14. a) (i) Explain neatly the ASIC design flow. (8)

(ii) Briefly discuss about different types of ASIC (8)

Or

b) (i) Implement the following function using CMOS

f(A,B,C)=A’BC+AB’C+ABC’ (8)

(ii) Explain the programmable logic structure available in PAL (8)

15. a) Briefly explain the system level test techniques with neat diagram.

Or

b) Explain with diagram the design strategies for testing with CMOS devices

Click the following link to download:

http://www.ziddu.com/download/7668330/VLSIND08.pdf.html