LSI design flow and EDA

In the final check before tape-out (sign-off), which power-network analysis is performed alongside timing verification?

  1. AChecking the package color
  2. BIR drop and electromigration analysis
  3. CEstimating the chip price
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Answer: B. IR drop and electromigration analysis

Sign-off includes, in addition to timing and DRC/LVS, analysis of voltage drop in the power network (IR drop) and electromigration due to current density in wires. Because a lower supply voltage worsens timing, the two are sometimes analyzed together.

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  1. Which design philosophy refines layouts and the like to make them less susceptible to manufacturing variation and defects?
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  3. What is the main purpose of placing dummy patterns that do not function as circuits in empty areas of the layout?
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