A new approach for noise simulation in transient analysis

A novel technique to simulate noise is presented. Simulation of noise, which is traditionally done in the AC analysis, is shown to be also possible in the transient analysis. The proposed technique has been implemented in the electrical simulator ELDO, which therefore becomes the first simulator able to compute noise regardless of the kind of analysis. The method includes noise sources in the time domain, and the spectrum characteristics of these sources are related to new noise models available whatever the bias conditions of the components. This new technique could be applied to all electrical circuits but its usefulness is shown especially for sensitive analog sampling circuits where the knowledge of their accuracy is of high importance