Carrier drift velocity can be given as the product of µ and E and the maximum carrier drift velocity is approximately equal to Vsat regardless of the supply voltage.
32. The transit time can be given as
a) 2d
b) 2d/µE
c) µE/d
d) µE/2d
Answer: b
The transit time can be given by L/Vdrift which is equivalent to 2d/µE as L = 2d and Vdrift is µE.
33. Maximum transit time occurs when the size of the transistor is
a) minimum
b) maximum
c) does not depend on size
d) double
Answer: a
Maximum transit time occurs when the size of the transistor is minimum and when Va is approximately 0.
34. The spacing of interconnect is scaled by
a) α
b) 1/α
c) α2
d) 1/α2
Answer: b
Spacing of interconnect, width, and thickness are scaled by 1/α as they are linear dimensions.
35. Cross-section area is scaled by
a) α
b) 1/α
c) α2
d) 1/α2
Answer: d
The cross-section area is scaled by 1/α2 as the area is the product of length and width which are scaled by 1/α.
36. The decrease in device dimension ______ the die size.
a) increases
b) decreases
c) does not affect
d) decreases and then increases
Answer: a
The decrease in device dimension increases the die size and also the levels of integration.
37. The reduction in die size reduces
a) R
b) d
c) L
d) W
Answer: a
The reduction in die size also reduces R and C. Die size depends on both resistor and capacitor.
38. The propagation delay along the optical fiber interconnect can be given as
a) n/Lx
b) nL/c
c) c/nL
d) nc/L
Answer: b
The propagation delay along the optical fiber interconnect can be given as nL/c where n is the refractive index, L is the length of the fiber and c is the speed of light.
39. The breakdown voltage can be reduced by _____ electric field strength.
a) increasing
b) decreasing
c) does not depend
d) exponentially decreasing
Answer: a
The increase in electric field strength lowers the breakdown voltages. The electric field is inversely proportional to the voltage.
40. Greater the switching speed _____ is the more.
a) low
b) more
c) all of the mentioned
d) none of the mentioned
Answer: b
An increase in switching speed increases the noise problems. Switching speed is the rate a which the logic level varies.
