Delve into the world of Heterojunction Bipolar Transistors (HBTs) with this insightful English e-book. Unravel the complexities of HBT modeling, exploring its fundamental principles and advanced concepts. This detailed guide presents a comprehensive analysis of device characteristics, mathematical models, and their practical implications. Covering small-signal and large-signal modeling, alongside the intricacies of advanced HBT structures, this e-book caters to the academic and professional needs of those immersed in semiconductor device modeling.