Real equilibrium solutions of electronic circuits are affected by deviation of real characteristics of devices\udfrom their nominal values, producing the displacement of solution points from their nominal position.\udIn this paper, a method to determine all the equilibrium regions in which real equilibrium points\udmay fall is presented. The analysis is based on the introduction of the so-called strip characteristics that\udrepresent the characteristics of devices affected by tolerances. They are modeled by polyhedral characteristics.\udDifferent situations may occur as tolerances grow. A nominal solution point may disappear, or\udon the other end, some solution point not present with nominal characteristics may appear. These\udpossible events call for a classification of the equilibrium regions in either certain or uncertain, depending\udon the existence or not of an equilibrium point for any choice of real characteristics. The algorithm\udadopts linear programming techniques and a clustering algorithm.
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