The first book devoted entirely to HBTs, this reference examines the basic concept, standard and advanced structures, noise performance, reliability issues, and simulation. It’s main emphasis is on device physics and its mathematical representations, through which the operational characterization of AlGaAs/GaAs HBTs can be understood. It enables device engineers, device researchers, and circuit designers to increase their knowledge of HBT principles and behavior with significantly less literature research time, and to design optimal HBTs with minimal design time. Extensively referenced, with 150 illustrations and 250 equations.