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A 50-GHz static frequency divider and 40-Gb/s MUX/DEMUX using self-aligned selective-epitaxial-growth SiGe HBTs with 8-ps ECL

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6 Author(s)
Washio, K. ; Central Res. Lab., Hitachi Ltd., Kokubunji, Japan ; Ohue, E. ; Oda, K. ; Hayami, R.
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A static frequency divider with a maximum operating frequency of up to 50 GHz and a multiplexer (MUX) and a demultiplexer (DEMUX) that both operate at 40 Gb/s were developed for future optical-fiber-link systems. These digital circuits were fabricated using ultra-high-speed self-aligned selective-epitaxial-growth SiGe-base hetero-junction bipolar transistors (HBTs) with self-aligned stacked metal/in-situ doped poly-Si electrodes. These HBTs provide a 95-GHz cutoff frequency, a 108-GHz maximum oscillation frequency, and a minimum emitter-coupled-logic (ECL) gate delay of 8 ps. The excellent results from this digital chipset show that SiGe HBT technology, with its high reliability and cost-effectiveness, will play an important role in future multi-gigabit per second optical-fiber-link systems

Published in:

Electron Devices, IEEE Transactions on  (Volume:48 ,  Issue: 7 )

Date of Publication:

Jul 2001

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