Patent ID: 7313771

Claim:
A system for computing current in a digital circuit based on an accurate current model for library cells, the system comprising: a characterization module operable to: access a cell library; for each cell in the cell library corresponding to a cell in a digital circuit, generate a plurality of waveforms of current drawn by the cell from a power supply according to one or more predetermined values of one or more input parameters of the cell; and a current waveform generator operable to: analyze the digital circuit to determine one or more actual values of the input parameters of each cell in the digital circuit; for each of the cells in the digital circuit, generate a current waveform according to the determined actual values of the input parameters and a waveform of current drawn by the cell from the power supply generated by the characterization module corresponding to the determined actual values of the input parameters; and sum the current waveforms of the cells in the digital circuit to generate a waveform of current drawn by the digital circuit from the power supply for use in a pattern-dependent methodology (PDM) or a pattern-independent methodology (PIM).