This set of VLSI Questions and Answers for Experienced people focuses on “Limitations of Scaling -2”.
1. Maximum transit time occurs when the size of the transistor is
c) does not depend on size
Explanation: Maximum transit time occurs when the size of the transistor is minimum, when Va is approximately 0.
2. The spacing of interconnect is scaled by
Explanation: Spacing of interconnect, width and thickness are scaled by 1/α as they are linear dimensions.
3. Cross section area is scaled by
Explanation: Cross section area is scaled by 1/α2 as area is the product of length and width which are scaled by 1/α.
4. The decrease in device dimension, _______ the die size
c) does not affect
d) decreases and then increases
Explanation: The decrease in device dimension increases the die size and also the levels of integration.
5. The reduction in die size, reduces
Explanation: The reduction in die size also reduces R and C. Die size depends on both resistor and capacitor.
6. The propogation delay along the optical fiber interconnect can be given as
Explanation: The propogation 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.
7. The breakdown voltage can be reduced by _____ electric field strength
c) does not depend
d) exponentially decreasing
Explanation: The increase in electric field strength lowers the breakdown voltages. Electric field is inversely proportional to the voltage.
8. Greater the switching speed, _____ is the more
Explanation: Increase in switching speed increases the noise problems. Switching speed is the rate a which the logic level varies.
9. Substrate concentration is scaled by
Explanation: Substrate concentration Nb which gives the doping level of substrate is scaled by α.
10. The increase in operating frequency results in ______ in cross-talk noise
c) no change
Explanation: The increase in operating frequency and reduction in rise time tr results in the increase of cross-talk noise.
11. Flicker noise is scaled by
Explanation: Flicker noise occurs due to fluctuations of carriers trapped in the channel by surface states. It is scaled by α2/β2.
12. Scaling affects _____ generated noise
c) internally and externally
d) does not generate
Explanation: Scaling affects both internally and externally generated noise and this degrades both the production yeild and the reliability of high density chip layouts.
Sanfoundry Global Education & Learning Series – VLSI.
To practice all areas of VLSI for Experienced people, here is complete set of 1000+ Multiple Choice Questions and Answers.