Delay Modeling

• Have already seen where gate propagation delay is a function of

  • input slew rate
  • Output capacitance load

• Output slew rate is also function of input slew rate, output load

• Can calculate propagation delay, output slew via either table lookup or direct calculation

  • Table lookup fast, but to get good accuracy may need lots of data points (input slew axis * output load axis * environment)
  • Delay modeling can reduce data needed, but can be inaccurate

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