A new approach to modeling the current vs voltage characteristics of heterojunction bipolar transistors (HBTs) is introduced. Using McKelvey's flux method to treat carrier transport, provides a strong, physical basis for modeling the complex device physics in modern HBTs. We formulate the new model for general, double heterojunction bipolar transistors and show that the results reduce to those obtained by the conventional current balancing approach only under specific, simplifying conditions. We also extend the model to treat quasi-ballistic transport in short base HBTs.
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