Estimating noise impact on delay after a modification to an integrated circuit design
AssigneeInternational Business Machines Corporation
InventorsJason David Morsey, Steven Eugene Washburn, Alexander Joel Suess, Gregory Schaeffer
Life of this patent
Estimating the term…
Abstract
A computer-implemented method for estimating noise adjustments in an integrated circuit design includes computing a first noise impact on timing calculation including a first slew rate and a first delay due to coupled noise prior to a physical design change; computing a second slew rate after the physical design change; and computing a second noise impact on a timing calculation based on the first delay and a ratio of the second slew rate and the first slew rate.
Claims20
A computer-implemented method for estimating noise adjustments in an integrated circuit (IC) design, the computer-implemented method comprising:
- computing a first noise impact on timing calculation including a first slew rate and a first delay due to coupled noise prior to a physical design change;
- computing a second slew rate after the physical design change;
- and
- computing a second noise impact on timing calculation based on the first delay and a ratio of the second slew rate and the first slew rate.
A computer comprising:
- a memory having computer readable instructions;
- and
- a processor set for executing the computer readable instructions to configure the computer to estimate delay after modification of an integrated circuit (IC) design;
- wherein the delay after modification is estimated as a function of a delay prior to the modification and a ratio of a slew rate after the modification and a slew rate prior to the modification.
A computer program product comprising one or more computer-readable memory devices encoded with data including computer-readable instructions that, when executed, causes a processor set to estimate a timing delay for a gate after a modification to an integrated circuit design, wherein the timing delay is estimated as a function of timing delay for the gate prior to the modification and a ratio of slew rate for the gate after the modification and slew rate for the gate prior to the modification.
Dependencies are inferred from the claim text.