Patent Document ID: 20050015235
Application ID: 10891083
Patent Flag: 0

Claim One:
1. A simulator, comprising a transistor characteristics calculation section calculating, from predetermined model equations, characteristics of a transistor including a gate section, a source section, and a drain section, the transistor having a drain current between the source section and the drain section controllable with a gate voltage applied to the gate section, the transistor including regions of mutually different impurity concentrations below the gate section providing a path for the drain current, wherein: one of the model equations represents a resistance between a source section electrode and a drain section electrode and has terms associated with each of the regions and representing resistance values of the regions; at least two of the terms each have a threshold parameter indicating a transition voltage at which a semiconductor element including the associated region and regions adjacent to the associated region changes from a state where the element exhibits such a low conductance that a resistance of the associated region varies exponentially with the gate voltage to a state where the element exhibits such a high conductance that the resistance of the associated region varies with the gate voltage more moderately than exponential variations; and the threshold parameters of the terms are specified independently from each other.