Early voltage in double heterojunction bipolar transistors |
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Authors: | Jahan M.M. Anwar A.F.M. |
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Affiliation: | Dept. of Electr. & Syst. Eng., Connecticut Univ., Storrs, CT; |
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Abstract: | The Early voltage for abrupt double heterojunction bipolar transistors (DHBTs) has been calculated by using an effective junction velocity (Sc) at the base-collector heterojunction. Sc is obtained by self-consistently partitioning thermionic and quantum mechanical tunneling currents. Unlike single heterojunction bipolar transistors (SHBTs), the Early voltage varies very rapidly at low reverse bias and approaches the SHBT-limit at sufficiently high reverse bias. This is attributed to the presence of an energy barrier at the b-c heterojunction |
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