In order to achieve augmentation of the accuracy in calculation of noise and
augmentation
of the accuracy in a noise check which is performed, for example, when an electronic
circuit is designed and further realize significant reduction of the time required
for a noise check and augmentation of the operation efficiency by reduction of
the man-hours of a designer in a noise analysis, a noise checking apparatus includes
a model production section (3) for producing a simulation model of a circuit
portion relating to a noticed wiring line, a simulation section (4) for
performing a simulation using the simulation model to calculate a signal waveform
which propagates in the noticed wiring line and calculate a noise waveform superposed
on the signal waveform for each kind of noise, a noise waveform synthesis section
(5) for synthesizing the signal waveform and the noise waveforms with generation
timings of the noise waveforms taken into consideration to obtain a noise composite
waveform, and a noise checking section (6) for performing noise checking
based on the noise composite waveform.
