GaAlAs-GaAs heterojunction bipolar transistors (HBTs) with an abrupt emitter-base interface have been realised by molecular-beam epitaxy (MBE) on semi-insulating substrates. A gain-bandwidth product FT of 15 GHz has been measured for Ic = 20 mA and VCE = 8 V. These results are the best reported so far for HBTs and are very promising for high-speed logic.
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Ankri et al. (1983) studied this question.
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