InGaAs/InAlAs/InP collector-up microwave heterojunction bipolar transistors Sato, H. ; Vlcek, J. C. ; Fonstad, C. G. ; Meskoob, B. ; Prasad, S. Abstract Publication: IEEE Electron Device Letters Pub Date: October 1990 DOI: 10.1109/55.62995 Bibcode: 1990IEDL...11..457S