250+ TOP MCQs on MOS Circuit Scaling – 2 and Answers

VLSI Multiple Choice Questions on “MOS Circuit Scaling – 2”.

1. The gate delay is proportional to:
A. Ron .Cg
B. Rs.Cds
C. Rd.Cgs
D. Ron.Cox
Answer: A
Clarification: The gate delay is proportional to channel resistance and gate capacitance

2. The maximum operating frequency is scaled by:
A. 1/α²
B. β/α²
C. α²/β
D. 1
Answer: C
Clarification: Maximum operating frequency s inversely proportional to the gate delay. It is scaled by α²/β

3. The saturation current is scaled by the factor of:
A. 1
B. 1/α²
C. 1/β
D. 1/α
Answer: C
Clarification: 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/α²
B. 1
C. α²
D. α²/β
Answer: C
Clarification: Current density is scaled by a factor of α²/β and since it is in Constant voltage model, β = 1, therefore α² is correct answer

5. Switching energy per gate is scaled by the factor of:
A. 1
B. α²/β
C. 1/ β.α²
D. α²
Answer: C
Clarification: Switching energy per gate is scaled by a factor of 1/ β.α²

6. In Constant field model, the scaling factor of switching energy per gate would be:
A. 1/ β.α²
B. 1/ α³
C. 1/ α²
D. All of the mentioned
Answer: B
Clarification: Since in constant field model α = β

7. The power dissipation per gate is scaled as:
A. 1
B. 1/ β.α²
C. α²/β
D. 1/ β²
Answer: D
Clarification: Power dissipation per gate is scaled by the factor of 1/β²

8. The dynamic component of power dissipation is given by:
A. P = I².Rd
B. P = Vdd²/Rd
C. P = Eg.fo
D. All of the mentioned
Answer: C
Clarification: 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 = I².Rd
B. P = Vdd²/Ron
C. P = Eg.fo
D. All of the mentioned
Answer: B
Clarification: 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/α²
C. 1/ β.α²
D. α²/β²
Answer: D
Clarification: The scaling factor of power dissipation per unit area is α²/β²

11. The power speed product has the scaling factor of:
A. 1
B. 1/α²
C. 1/ β.α²
D. None of the mentioned
Answer: C
Clarification: The power speed product has the scaling factor of 1/ β.α²

12. The scaling factor of power dissipation per unit area in constant field model is:
A. 1
B. 1/α²
C. 1/ β.α²
D. α²/β²
Answer: A
Clarification: 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
Answer: C
Clarification: 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
Answer: B
Clarification: Switching energy has the same scaling factor as that of power speed products.

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