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High-speed frequency dividers using self-aligned AlGaAs/GaAs heterojunction bipolar transistors

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5 Author(s)
Ishibashi, T. ; NTT Electrical Communications Laboratories, Kanagawa, Japan ; Yamauchi, Y. ; Nakajima, O. ; Nagata, K.
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A divide-by-four frequency divider and ring oscillators have been fabricated employing self-aligned AlGaAs/GaAs heterojunction bipolar transistors (HBT's). Maximum toggle frequency of 13.7 GHz and propagation delay time of 17.2 ps are achieved in ECL gate circuitry. These values are the highest and the lowest in ECL circuits and in bipolar circuits, respectively, ever reported.

Published in:

Electron Device Letters, IEEE  (Volume:8 ,  Issue: 5 )