250+ TOP MCQs on Scaling Factors -2 and Answers

VLSI Interview Questions and Answers for freshers focuses on “Scaling Factors -2”.

1. Carrier density is scaled by
A. α
B. β
C. 1
D. α²
Answer: C
Clarification: Carrier density in channel Qon is scaled by 1. Carrier density is given by C0*Vgs where C0 is scaled by β and Vgs is scaled by 1/β.

2. Channel resistance Ron is scaled by
A. α
B. β
C. 1
D. α²
Answer: C
Clarification: Channel resistance Ron is scaled by 1. Channel resistance is given by (L/W)*(1/Qonµ).

3. Gate delay is given by
A. Ron/Cg
B. Ron * Cg
C. Cg/Ron
D. Cg² /Ron
Answer: B
Clarification: Gate delay Td is given as the product of Ron, channel resistance and Cg the gate capacitance.

4. Maximum operating frequency is scaled by
A. α/β
B. β/α
C. α² /β
D. β² /α
Answer: C
Clarification: Maximum operating frequency f0 is scaled by α²/β. This is given by (W/L)*(µ*C0*Vdd/Cg).

5. Saturation current is scaled by
A. α
B. β
C. 1/α
D. 1/β
Answer: D
Clarification: Saturation current Idss is scaled by 1/β. This is given by (Co*µ/2)*W/L*(Vgs-Vt)² .

6. Vgs is scaled by
A. α
B. β
C. 1/α
D. 1/β
Answer: D
Clarification: Gate to source voltage Vgs is scaled by 1/β. All voltages are scaled by 1/β.

7. Current density J is scaled by
A. α/β
B. β/α
C. α²/β
D. β²/α
Answer: C
Clarification: Current density J is scaled by α^2/β. Current density is given by Idss/A where Idss is scaled by 1/β and area A by 1/α^2.

8. Power dissipation per gate is scaled by
A. 1/α
B. 1/β
C. 1/α²
D. 1/β²
Answer: D
Clarification: Power dissipation per gate is scaled by 1/β^2. This is the sum of static component Pgs and dynamic component Pgd.

9. Power dissipation per unit area is scaled by
A. 1/α
B. 1/β
C. β²/α²
D. α²/β²
Answer: D
Clarification: Power dissipation per unit area Pa is scaled by α²/β². This is given by Pg/Ag where Pg is scaled by 1/β² and Ag by 1/α².

10. In constant voltage model, the saturation current is scaled by
A. α
B. β
C. 1
D. β²
Answer: C
Clarification: Saturation current is scaled by 1 in constant voltage model. This is because saturation current is scaled by 1/β and here in constant voltage model β is 1.

11. In constant field model, maximum operationg frequency is scaled by
A. α
B. β
C. α²
D. β²
Answer: A
Clarification: In constant field model, maximum operating frequency is scaled by α. Maximum operating frequency is scaled by α²/β and here in this model β = α.

12. In constant electric field model, power dissipation per unit area is scaled by
A. α
B. β
C. 1
D. β²
Answer: C
Clarification: Power dissipation per unit area is scaled by 1 in constant electric field model. This is scaled by α²/β² and here in constant electric field model β = α.

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