Abstract
Cutoff frequency Jr characteristics for AlGaAs/GaAs HBTs with planar structures are studied, by two-dimensional simulation, with an emphasis placed on their dependences on the collector parameters. It is shown that the sub-collector resistance becomes an important factor to achieve a higher fTin the high current region, and so it should be made as low as possible. Effects of introducing semi-insulating external collectors are also studied. It is shown that the introduction of semi-insulating layer is effective to improve the fTcharacteristics provided that it is slightly away from the intrinsic collector region.
Original language | English |
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Pages (from-to) | 331-340 |
Number of pages | 10 |
Journal | COMPEL - The international journal for computation and mathematics in electrical and electronic engineering |
Volume | 12 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1993 Apr 1 |
ASJC Scopus subject areas
- Computer Science Applications
- Computational Theory and Mathematics
- Electrical and Electronic Engineering
- Applied Mathematics