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Effect of Scaling of Interconnections on the Time Delay of VLSI Circuits

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2 Author(s)

Effect of scaling of dimensions, i.e., increase in chip size and decrease in minimum feature size, on the RC time delay associated with interconnections in VLSIC's has been investigated. Analytical expressions have been developed to relate this time delay to various elements of technology, i.e., interconnection material, minimum feature size, chip area, length of the interconnect, etc. Empirical expressions to predict the trends of the technological elements as a function of chronological time have been developed. Calculations of time delay for interconnections made of poly-Si, WSi2, W, and Al have been done and they indicate that as the chip area is increased and other device-related dimensions are decreased the interconnection time delay becomes significant compared to the device time delay and in extreme cases dominates the chip performance.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:17 ,  Issue: 2 )