Abstract
This paper reviews the principles and status of AlGaAs/GaAs heterojunction bipolar transistor technology. Comparisons of this technology with Si bipolar transistor and GaAs field-effect transistor technologies are made. Epitaxial materials, fabrication processes, transistor DC and RF characteristics, and modeling of AlGaAs/GaAs HBT's are described. Key areas of HBT application are also highlighted. >
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