model for gate output slew computation in early synthesis

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United States of America Patent

PATENT NO 9946824
SERIAL NO

14086610

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Abstract

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A slew-based effective capacitance (Ceff) is used to compute gate output slew during early synthesis of an integrated circuit design. A π model is constructed for the gate and reduced to two parameters which are used to compute a slew value for the model, given a slew definition. A capacitance coefficient is then calculated as a function of this slew value. The effective capacitance is the product of the coefficient and the total capacitance of the π model. The output slew of the gate may in turn be computed using the slew-based Ceff. The coefficient may be computed by iteratively solving an equation representing output voltage over time dependent on the first and second parameters, by directly solving a closed-form equation which is a function of the first and second parameters, or by looking up the capacitance coefficient in a table indexed by the first and second parameters.

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Patent Owner(s)

  • INTERNATIONAL BUSINESS MACHINE CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Alpert, Charles J Austin, US 54 574
Li, Zhuo Cedar Park, US 167 845
Nassif, Sani R Austin, US 71 916
Zhang, Yilin Austin, US 32 213
Zhou, Ying Cedar Park, US 169 1343

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