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High gain-bandwidth differential distributed InP D-HBT driver amplifiers with large (11.3 Vpp) output swing at 40 Gb/s

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12 Author(s)
Baeyens, Y. ; Lucent Technol. Bell Labs., Murray Hill, NJ, USA ; Weimann, Nils ; Roux, P. ; Leven, Andreas
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High-performance and compact 40-Gb/s driver amplifiers were realized in 1.2-μm emitter double-heterojunction InGaAs-InP HBT (D-HBT) technology with a maximum cut-off frequency (fT) of 150 GHz and a maximum oscillation frequency (fmax) of 200 GHz. Two-stage differential drivers feature a lumped input and fully distributed output stage and deliver a maximum differential output swing of 11.3 V peak-to-peak (Vpp) at 40 Gb/s with less then 350 fs of added rms jitter and rise and fall times of about 7 ps while consuming a total power of 3 W. When biased at a lower output swing of 6.3 Vpp, excellent 40-Gb/s eyes with a 7-ps fall time, 6-ps rise time, and no observable jitter deterioration compared with the input source are obtained at a reduced power consumption of 1.7 W. On-wafer measured differential S-parameters show a differential gain of 25 dB, 50 GHz bandwidth, and input and output reflection below -20 dB from 2 to 45 GHz. The amplifiers' small die size (1.0×1.7 mm), relatively low power consumption, large output swing, and ability to have dc coupled inputs and outputs enable compact 40-Gb/s optical transmitters with good eye opening for both conventional transmission formats such as nonreturn-to-zero and return-to-zero and alternative formats such as duobinary and differential phase shift keying.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:39 ,  Issue: 10 )