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- W2132698052 abstract "Small-sized collector-up Ge/GaAs HBT's are successfully fabricated and their operation at a high collector current density and at a high frequency is realized for the first time. The current gain of these devices reaches a peak value as large as 200 at a current density 6/spl times/10/sup 4/ Acm/sup /spl minus/2/, and no degradation in the current gain is observed as the collector width is decreased down to 2 /spl mu/m. The capability of lower voltage operation is also shown. Intrinsic and extrinsic base resistances are as low as 180 /spl Omega///spl square/ and 90 /spl Omega///spl square/, respectively. The calibrated values of f/sub T/ and f/sub max/ are 25 GHz and 60 GHz, respectively. The larger value of f/sub max/ compared with f/sub T/ might be attributed to low base resistance and low base-collector capacitance as expected from the collector-up structure. >" @default.
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- W2132698052 date "1994-02-01" @default.
- W2132698052 modified "2023-09-27" @default.
- W2132698052 title "Small-sized collector-up Ge/GaAs heterojunction bipolar transistors with high gain, low base resistance, and high f/sub max/" @default.
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- W2132698052 doi "https://doi.org/10.1109/55.285375" @default.
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