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) α2
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) α2
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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) Cg2 /Ron
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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) α2 /β
d) β2 /α
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Explanation: 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
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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
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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) α2/β
d) β2/α
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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/α2
d) 1/β2
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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) β2/α2
d) α2/β2
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Explanation: 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
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) α2
d) β2
View Answer
Explanation: 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
View Answer
Explanation: 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.
Sanfoundry Global Education & Learning Series – VLSI.
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