DHBT: This is the abbreviation for Double Heterojunction Bipolar Transistor. Emitter-Up Geometry: This refers to a specific configuration of the DHBT where the emitter layer is on top. Diagram: A schematic representation of the DHBT, showing the layers, junctions, and current flow. Equations and Calculations: There are some handwritten equations and calculations, likely related to the analysis or design of the DHBT. However, without more context, it is difficult to decipher their exact meaning. Alternative: There is a mention of an "Alternative," but it's unclear what it refers to without more context. BJT Structure: A diagram shows the basic structure of a BJT with emitter (E), base (B), and collector (C) regions. Homojunction: The term "homojunction" is mentioned, indicating that the BJT has similar semiconductor materials in the emitter, base, and collector regions. Heterojunction: The term "heterojunction" is mentioned, indicating that the HBT has different semiconductor materials in the emitter, base, and collector regions. Doping Levels: The notes discuss the doping levels in the different regions of the BJT and HBT. In a typical BJT, the base is lightly doped compared to the emitter and collector. In an HBT, the emitter is heavily doped compared to the base and collector. Base Width: The importance of minimizing the base width in BJTs and HBTs is highlighted. A smaller base width leads to better transistor performance. Emitter Injection: The notes mention the need to increase emitter injection efficiency, especially for large current densities. Modulation: The term "modulation" is used, but without more context, it's unclear what specific type of modulation is being referred to.

6.772 Lecture 14 Notes

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