Computing current in a digital circuit based on an accurate current model for library cells

A method for computing current in a digital circuit based on an accurate current model for library cells, the method comprising:

• accessing a cell library;
• for each cell in the cell library corresponding to a cell in a digital circuit, generating 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;
• analyzing 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, generating 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
• summing 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 patten-independent methodology (PIM).

Logic for computing current in a digital circuit based on an accurate current model for library cells, the logic encoded in one or more media for execution and when executed 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;
• 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 patten-independent methodology (PIM).

A system for computing current in a digital circuit based on an accurate current model for library cells, the system comprising:

• means for accessing a cell library;
• means for, for each cell in the cell library corresponding to a cell in a digital circuit, generating 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;
• means for analyzing the digital circuit to determine one or more actual values of the input parameters of each cell in the digital circuit;
• means for, for each of the cells in the digital circuit, generating 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
• means for summing 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 patten-independent methodology (PIM).