VLSI-MGU-ECE-S7-QP-Module 3

4 Marks:1. Discuss the delay effect due to capacitance of

layers.

2. Write a brief note on scaling of MOS structures.

3. What are latch up? What is its effect on the

chip?

4. State the principle of scaling.5. Write a note on latch up in CMOS transistor?6. Write a note on stick diagrams.

7. List the names of at least 4 CMOS technologies.8. What is the cause for "Bird's beak”?9. Discuss the need for design rules.10. Compare a metal gate with a Si gate in CMOS

transistor?

11. How MOS resistors and capacitors are

fabricated in IC form?

12. What are the advantages of silicon gate over

metal gate?

13. Discuss the BiCMOS technology.14. Discuss the problem of driving large capacitance loads from a CMOS gate.15. When does latch up condition arise during

CMOS IC fabrication?

16. How does the choice of the gate material affect

the performance of the transistor?

17. Explain about design rule checkers.

18. Draw the structure of MOS capacitance model.

12 Marks:

1. Explain the Twin well process.

2. Discuss the BiCMOS fabrication steps and the circuit design process.

3. Explain the p-well process with the help of

diagrams.

4. Discuss about BiCMOS technology.

5. Explain the fabrication steps in a BiCMOS

process.

6. List the design rules for Metal 1, Vias F Poly in

a CMOS process.

7. Describe the n-well C-MOS process steps with

the help of diagram.

8. Write notes on:

a. Scaling of MOS structure.

b. Stick diagram.

9. Explain twin well process in CMOS technology?

10. Explain the effect of scaling as the electrical parameters of a MOS structure?

11. Explain the fabrication process of BiCMOS

inverter circuit with neat diagram.

12. Explain about scaling of MOS structures.

13. Discuss the CMOS fabrication technology.

14. Explain scaling factors and miniaturization as

applied to CMOS VLSI chips.

15. Explain the fabrication process of twin well

CMOS process.

16. Draw the stick diagram of a typical CMOS

circuit and explain its operation.

17. Explain in detail the design rule checkers

18. Explain the process steps involved in the

fabrication of BiCMOS inverter.