Patent ID: 6842727

Claim:
A method for analyzing EMI noise comprising: a step of extracting a power supply netlist of a circuit under analysis from a layout data; a step of calculating the power supply current waveforms of respective blocks of said circuit by the use of a block netlist and test vector data, the power supply current waveforms expressed at least in the time domain; a step of generating a power supply current with an additional electric current source(s) by giving electric currant sources having the power supply current waveforms of said respective blocks to said power supply netlist; a step of calculating a power supply current/voltage waveform data, the power supply current/voltage waveform data expressed at least in the time domain, by performing a circuit simulation of said power supply netlist with an additional electric current source(s); and a step of calculating current voltage spectral data by performing the Fourier transformation of the power supply current/voltage waveform data as calculated in the step of performing said circuit simulation; a step of displaying the current/voltage spectral data as obtained in the step of performing the Fourier transformation.