VLSI Basic Circuit Concept MCQ Quiz – Objective Question with Answer for VLSI Basic Circuit Concept

51. Overall delay is directly proportional to _______

a) n
b) 1/n
c) n²
d) 1/n²

Answer: c

The overall delay is directly proportional to n2, where n is the number of pass transistors in series.

52. The number of pass transistors connected in series can be increased if _______

a) compressor is connected
b) buffer is connected
c) ground is connected
d) voltage regulator is connected

Answer: b

The number of pass transistors connected in series can be increased by connecting buffer in between.

53. Buffer is used because ___________

a) it increases the speed
b) decreases sensitivity to noise
c) decreases speed
d) does not affect speed

Answer: a

Buffer is used for long polysilicon runs because it increases the speed and reduces the sensitivity to noise.

54. The overall delay is ______ to the relative resistance r.

a) directly proportional
b) inversely proportional
c) exponentially proportional
d) not dependent

Answer: a

The overall delay is directly proportional to the relative resistance r. Overall delay is given as the product of n^2rcƮ.

55. Small disturbances of noise ___________

a) decreases the inverter voltage
b) increases the output voltage
c) switches the inverter stage between 0 to 1
d) does not switch the stage and keeps it stable

Answer: c

Small disturbances of noise switch the inverter stage between 0 and 1 or vice versa. It disturbs the normal operation or behavior.

56. The buffer speeds up the ___________

a) rise time
b) fall time
c) all of the mentioned
d) none of the mentioned

Answer: a

The buffer speeds up the rise time of propagated signal edge. A buffer is the combination of two inverters in which one output is fed to the other as the input.

57. Overall delay increases as n ___________

a) increases
b) decreases
c) exponentially decreases
d) logarithmically decreases

Answer: a

Overall delay increases as n increases where n is the number of pass transistors connected in series.

58. Which contributes to the wiring capacitance?

A. fringing fields
B. interlayer capacitance
C. peripheral capacitance
D. all of the mentioned

Answer: D

The sources of capacitance that contribute to the total wiring capacitance are fringing field capacitance, interlayer capacitance, and peripheral capacitance.

59. What does the value d in fringing field capacitance measure?

A. thickness of wire
B. length of the wire
C. wire to substrate separation
D. wire to wire separation

Answer: C

The quantity d in fringing field capacitance measures the wire to substrate separation. It is the distance between the wire and the substrate used in the device.

60. Total wire capacitance is equal to ___________

A. area capacitance
B. fringing field capacitance
C. area capacitance + fringing field capacitance
D. peripheral capacitance

Answer: C

Total wire capacitance can be given as the sum of area capacitance and fringing field capacitance.

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