This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “MOS Circuit Scaling – 2”.

1. The gate delay is proportional to:

a) Ron .Cg

b) Rs.Cds

c) Rd.Cgs

d) Ron.Cox

View Answer

Explanation: The gate delay is proportional to channel resistance and gate capacitance

2. The maximum operating frequency is scaled by:

a) 1/α^{2}

b) β/α^{2}

c) α^{2}/β

d) 1

View Answer

Explanation: Maximum operating frequency s inversely proportional to the gate delay. It is scaled by α

^{2}/β

3. The saturation current is scaled by the factor of:

a) 1

b) 1/α^{2}

c) 1/β

d) 1/α

View Answer

Explanation: The saturation current is scaled by the factor of 1/β

4. The scaling factor of current density in constant voltage model is:

a) 1/α^{2}

b) 1

c) α^{2}

d) α^{2}/β

View Answer

Explanation: Current density is scaled by a factor of α

^{2}/β and since it is in Constant voltage model, β = 1, therefore α

^{2}is correct answer

5. Switching energy per gate is scaled by the factor of:

a) 1

b) α^{2}/β

c) 1/ β.α^{2}

d) α^{2}

View Answer

Explanation: Switching energy per gate is scaled by a factor of 1/ β.α

^{2}

6. In Constant field model, the scaling factor of switching energy per gate would be:

a) 1/ β.α^{2}

b) 1/ α^{3}

c) 1/ α^{2}

d) All of the mentioned

View Answer

Explanation: Since in constant field model α = β

7. The power dissipation per gate is scaled as:

a) 1

b) 1/ β.α^{2}

c) α^{2}/β

d) 1/ β^{2}

View Answer

Explanation: Power dissipation per gate is scaled by the factor of 1/β

^{2}

8. The dynamic component of power dissipation is given by:

a) P = I^{2}.Rd

b) P = Vdd^{2}/Rd

c) P = Eg.fo

d) All of the mentioned

View Answer

Explanation: The dynamic component is the product of energy per gate and maximum operating frequency.

9. The static component of power dsssipation is given by:

a) P = I^{2}.Rd

b) P = Vdd^{2}/Ron

c) P = Eg.fo

d) All of the mentioned

View Answer

Explanation: The static component is the power dissipated across transistor when it is in ON state

10. The scaling factor of power dissipation per unit area is:

a) 1

b) 1/α^{2}

c) 1/ β.α^{2}

d) α^{2}/β^{2}

View Answer

Explanation: The scaling factor of power dissipation per unit area is α

^{2}/β

^{2}

11. The power speed product has the scaling factor of:

a) 1

b) 1/α^{2}

c) 1/ β.α^{2}

d) None of the mentioned

View Answer

Explanation: The power speed product has the scaling factor of 1/ β.α

^{2}

12. The scaling factor of power dissipation per unit area in constant field model is:

a) 1

b) 1/α^{2}

c) 1/ β.α^{2}

d) α^{2}/β^{2}

View Answer

Explanation: In constant field model α = β

13. The scaling factor of Logic Level 1 in constant field model is:

a) 1

b) 1/β

c) 1/α

d) α/β

View Answer

Explanation: The logic level 1 is scaled as 1/β. Since we are using constant field model, the scaling factor will be 1/α

14. The scaling factor similar to scaling factor of power speed product is:

a) Power dissipation per unit area

b) Switching Energy

c) Power dissipation per gate

d) All of the mentioned

View Answer

Explanation: Switching energy has the same scaling factor as that of power speed product.

15. The parameter which is not scaled to any factor is:

a) Power speed product

b) Switching energy

c) Channel resistance

d) All of the mentioned

View Answer

Explanation: Channel resistance is scaled by 1. Therefore there are no factors like α or β.

**Sanfoundry Global Education & Learning Series – VLSI.**

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