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.
12. Channel resistance Ron is scaled by
a) α
b) β
c) 1
d) α2
Answer: c
Channel resistance Ron is scaled by 1. Channel resistance is given by (L/W)×(1/Qonµ).
13. Gate delay is given by
a) Ron/Cg
b) Ron × Cg
c) Cg/Ron
d) Cg2 /Ron
Answer: b
Gate delay Td is given as the product of Ron, channel resistance and Cg the gate capacitance.
Gate delay is the essential performance metric, and it is defined as the length of time starting from when the input to a logic gate becomes stable and valid, to the time that the output of that logic gate is stable and valid.
14. Maximum operating frequency is scaled by
a) α/β
b) β/α
c) α2 /β
d) β2 /α
Answer: c
Maximum operating frequency f0 is scaled by α2/β. This is given by (W/L)×(µ×C0×Vdd/Cg).
15. Saturation current is scaled by
a) α
b) β
c) 1/α
d) 1/β
Answer: d
Saturation current Idss is scaled by 1/β. This is given by (Co×µ/2)×W/L×(Vgs-Vt)2 .
16. Vgs is scaled by
a) α
b) β
c) 1/α
d) 1/β
Answer: d
Gate to source voltage Vgs is scaled by 1/β. All voltages are scaled by 1/β.
17. Current density J is scaled by
a) α/β
b) β/α
c) α2/β
d) β2/α
Answer: c
Current density J is scaled by α2/β. Current density is given by Idss/A where Idss is scaled by 1/β and area A by 1/α2.
18. Power dissipation per gate is scaled by
a) 1/α
b) 1/β
c) 1/α2
d) 1/β2
Answer: d
Power dissipation per gate is scaled by 1/β2. This is the sum of static component Pgs and dynamic component Pgd.
19. Power dissipation per unit area is scaled by
a) 1/α
b) 1/β
c) β2/α2
d) α2/β2
Answer: d
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.
20. In the constant voltage model, the saturation current is scaled by
a) α
b) β
c) 1
d) β2
Answer: c
Saturation current is scaled by 1 in the constant voltage model. This is because saturation current is scaled by 1/β and here in the constant voltage model β is 1.
