In the present work we study the treatment of parameters' uncertainties in complex circuits, i.e. composed by lumped and distributed elements. These problems are usually treated by the use of Monte Carlo techniques, which are extremely time consuming. A simple procedure for the calculation of the upper and lower limit of the response is defined by using the wavelet expansion in time domain. When only a part of the circuit is affected by uncertainties we use the Thevenin's equivalent in the wavelet domain (straightforwardly evaluated) to further reduce the analysis' complexity.
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