An efficient analysis of circuits with nonlinear resistive elements can be performed using the equivalent sources method. The nonlinear resistors are replaced by sources which are iteratively corrected based on their terminal voltages or currents. The internal resistances of the sources remain unchanged during the iterative process and their values can be chosen so that the iterative procedure convergence is always ensured. The equivalent circuit remains unchanged and only the sources values are iteratively corrected. That allows the development of a fast procedure for circuit analysis which computes on each harmonic the transfer immitance matrix between the controlled sources and their control variables. The computation time is further decreased by iteratively selecting a specific number of harmonics in terms of their weight.

Keywords: Harmonic analysis, Nonlinear resistive circuits, Steady state computation.