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The result of this article is a new bond graph model for the BJT that transforms the modulated current sources into a non-linear resistor. Treating these current sources as a non-linear resistor is indeed correct, since they always dissipate power and never generate it, i.e., they really represent sinks rather than sources. Additionally, RS elements are added to the BJT bond graph, so that the entropy generation by means of power dissipation is modeled correctly. The so produced heat causes a feedback in the electrical performance of the BJT, since the current flow through a transistor is temperature dependent.
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