# VLSI Questions and Answers – VLSI Design

This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “VLSI Design”.

1. VLSI technology uses ________ to form integrated circuit.
a) transistors
b) switches
c) diodes
d) buffers

Explanation: Very large scale integration is the process of creating an integrated circuit with thousands of transistors into one single chip.

2. Medium scale integration has ____________
a) ten logic gates
b) fifty logic gates
c) hundred logic gates
d) thousands logic gates

Explanation: Small scale integration has one or more logic gate. Further improved technology is medium scale integration which consists of hundred logic gates. Large scale integration has thousand logic gates.

3. The difficulty in achieving high doping concentration leads to ____________
a) error in concentration
b) error in variation
c) error in doping
d) distribution error

Explanation: As photolithography comes closer to the fundamental law of optics, achieving high accuracy in doping concentration becomes difficult, which leads to error due to variation.

4. _________ is used to deal with effect of variation.
a) chip level technique
b) logic level technique
c) switch level technique
d) system level technique

Explanation: Designers must simulate multiple fabrication process or use system level technique for dealing with effects of variation.

5. As die size shrinks, the complexity of making the photomasks ____________
a) increases
b) decreases
c) remains the same
d) cannot be determined

Explanation: As the die size shrinks due to scaling, the number of die per wafer increases and the complexity of making the photomasks increases rapidly.

6. ______ architecture is used to design VLSI.
a) system on a device
b) single open circuit
c) system on a chip
d) system on a circuit

Explanation: SoC that is system on a chip architecture is used to design the very high level integrated circuit.

7. What is the design flow of VLSI system?

```i. architecture design
ii. market requirement
iii. logic design
iv. HDL coding ```

a) ii-i-iii-iv
b) iv-i-iii-ii
c) iii-ii-i-iv
d) i-ii-iii-iv

Explanation: The order of the design flow of VLSI circuit is market requirement, architecture design, logic design, HDL coding and then verification.

8. ______ is used in logic design of VLSI.
a) LIFO
b) FIFO
c) FILO
d) LILO

Explanation: First in first out (FIFO) technique and finite state machine technique is used in the logic design of the VLSI circuits.

9. Which provides higher integration density?
a) switch transistor logic
b) transistor buffer logic
c) transistor transistor logic
d) circuit level logic

Explanation: Transistor-transistor logic offers higher integration density and it became the first integrated circuit revolution.

10. Physical and electrical specification is given in ____________
a) architectural design
b) logic design
c) system design
d) functional design

Explanation: Functional design defines the major functional units of the system, interconnections, physical and electrical specifications.

11. Which is the high level representation of VLSI design?
a) problem statement
b) logic design
c) HDL program
d) functional design

Explanation: Problem statement is a high level representation of the system. Performance, functionality and physical dimensions are considered here.

12. Gate minimization technique is used to simplify the logic.
a) true
b) false

Explanation: Gate minimization technique is used to find the simplest, smallest and effective implementation of the logic.

Sanfoundry Global Education & Learning Series – VLSI.

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