Patent ID: 7596775

Claim:
A method of using Electronics Design Automation tools for determining a standard cell for an integrated circuit comprising: providing a plurality of standard cells with a same function; utilizing an environmental simulator to generate a plurality of circuit parameters corresponding to each of the standard cells in each of a plurality of different surrounding cell environments; subtracting ideal timing data from each corresponding circuit parameter of each standard cell to generate a plurality of differences of circuit parameters; utilizing the Electronics Design Automation tools to transform a distribution of the plurality of differences of circuit parameters of each standard cell into a respective cell index for each standard cell according to (Y/N)/X, where Y, N, and X are greatest number of differences of circuit parameters, total number of the plurality of differences of circuit parameters, and range of the plurality of differences of circuit parameters respectively; and choosing one standard cell from the plurality of standard cells with the same function for the integrated circuit according to the cell index of each standard cell.