VLSI Questions and Answers – Propogation Delays

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This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “Propogation Delays”.

1. Propogation time is directly proportional to
a) x
b) 1/x
c) x2
d) 1/x2
View Answer

Answer: c
Explanation: Propogation time is directly proportional to square of the propogation distance (x2 ). It is the time taken by the signal to move from input port to output port.
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2. The total resistance can be given as
a) nRs
b) nrRs
c) rRs
d) Rs
View Answer

Answer: b
Explanation: The total resistance can be given as the product of nrRs where r is the relative resistance per section in terms of Rs.

3. Total capacitance can be given as
a) n(square Cg)
b) nc(square Cg)
c) c(square Cg)
d) square Cg
View Answer

Answer: b
Explanation: Total capacitance can be given as the product of nc(square Cg) where c is the relative capacitance per section in terms of square Cg.

4. Overall delay is directly proportional to
a) n
b) 1/n
c) n2
d) 1/n2
View Answer

Answer: c
Explanation: The overall delay is directly proportional to n2 , where n is the number of pass transistors in series.
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5. 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
View Answer

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

6. Buffer is used because
a) it increases the speed
b) decreases senstivity to noise
c) decreases speed
d) does not affect speed
View Answer

Answer: a
Explanation: Buffer is used for long polysilicon runs because it increses the speed and reduces the sensitivity to noise.

7. The overall delay is ______ to the relative resistance r
a) directly proportional
b) inversely proportional
c) exponentially proportional
d) not dependent
View Answer

Answer: a
Explanation: The overall delay is directly proportional to the relative resistance r. Overall delay is given as product of n^2rcƮ.
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8. 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
View Answer

Answer: c
Explanation: Small disturbanes of noise switches the inverter stage between 0 and 1 or vice versa. It disturbs the normal operation or behaviour.

9. The buffer speeds up the
a) rise time
b) fall time
c) all of the mentioned
d) none of the mentioned
View Answer

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

10. Overall delay increases as n
a) increases
b) decreases
c) exponentially decreases
d) logarithmically decreases
View Answer

Answer: a
Explanation: Overall delay increases as n increases where n is the number of pass transistors connected in series.
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Sanfoundry Global Education & Learning Series – VLSI.
To practice all areas of VLSI, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn