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Subject: Basic VLSI Design

Topic: VLSI Clocking and System Design

Difficulty: Medium

• As technology is advancing majorly due to device miniaturization, the wire interconnects starts playing a vital role in determining the performance of the system.
• As the device dimensions are scaled down, so are the dimension of wires scaling down.
• The minimum width of the wire is scaled by factor s, but the thickness is normally not scaled.
• Thus the wire capacitance scales down by a factor of 1/s. Also, length could be scaled down by a factor of s.
• The wire resistance dominates the resistance of the driving logic gate and it increases with each new technology generation.
• Thus to minimize an increase in global interconnect delay the cross-sectional area of global interconnects is not scaled i.e. W and H are not scaled down for global interconnects.