VLSI Design (EC-701) - Important Questions

Explain the various processing steps involved in VLSI fabrication from wafer preparation to final testing, highlighting the importance of cleanliness and process control.

Discuss the complete IC production process including crystal growth, wafer preparation, fabrication and packaging. Draw and explain the cross-sectional views wherever necessary.

Explain lambda-based design rules and their importance in ensuring reliable fabrication with suitable examples.

Explain MOS models. Derive the drain current equations for different regions of operation and sketch the ID-VDS characteristics.

Explain passive component models and discuss the modeling of resistors, capacitors and inductors in integrated circuits.

Explain short channel devices. Also mention its applications, advantages and limitations.

Explain circuit simulation using SPICE. Discuss the different types of analyses performed in SPICE (DC, AC, transient, noise, etc.) with suitable flowchart.

Discuss the impact of temperature dependence on the performance of BJTs in circuit simulations. How can temperature effects be mitigated in practical designs?

Explain the operation and architecture of microcoded controllers in structured digital circuits.

Explain Algotronix architecture, including its structure, functionality and significance in high-performance VLSI systems.

Explain the principle of quasi-static register cells, how they differ from static and dynamic registers, with a practical VLSI case study.

What is a systolic array? Explain its architecture for parallel processing, its advantages and challenges in implementing systolic array architectures.

Design a basic n-well CMOS process and explain its step-by-step fabrication including the enhancement techniques used in CMOS processing.

Describe the conditions and mechanisms that trigger latch-up in CMOS circuits. Explain the role of substrate resistance, injection current and power supply transients in initiating latch-up events.

Write short notes on any two of the following: a) Random logic vs structured logic b) Twin-tub CMOS process c) Layout design rules in CMOS d) Level 2 MOSFET model