This set of 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) α^{2}

View Answer

Explanation: 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) α^{2}

View Answer

Explanation: 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) Cg^{2} /Ron

View Answer

Explanation: 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) α^{2} /β

d) β^{2} /α

View Answer

Explanation: Maximum operating frequency f0 is scaled by α

^{2}/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

View Answer

Explanation: 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

View Answer

Explanation: 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) α^{2}/β

d) β^{2}/α

View Answer

Explanation: 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/α^{2}

d) 1/β^{2}

View Answer

Explanation: 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) β^{2}/α^{2}

d) α^{2}/β^{2}

View Answer

Explanation: Power dissipation per unit area Pa is scaled by α

^{2}/β

^{2}. This is given by Pg/Ag where Pg is scaled by 1/β

^{2}and Ag by 1/α

^{2}.

10. In constant voltage model, the saturation current is scaled by

a) α

b) β

c) 1

d) β^{2}

View Answer

Explanation: 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) α^{2}

d) β^{2}

View Answer

Explanation: In constant field model, maximum operating frequency is scaled by α. Maximum operating frequency is scaled by α

^{2}/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) β^{2}

View Answer

Explanation: Power dissipation per unit area is scaled by 1 in constant electric field model. This is scaled by α

^{2}/β

^{2}and here in constant electric field model β = α.

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