October 08, 2015

84-GBd (168-Gb/s) PAM-4 3.7-Vpp Power DAC in InP DHBT for short reach and long haul optical networks

  • Adamiecki A.
  • Aubry H.
  • Dupuy J.
  • Jorge F.
  • Konczykowska A.
  • Nodjiadjim V.
  • Riet M.

In this Letter, we report on the architecture and performances of multilevel driver for Pulse Amplitude Modulation (PAM) formats, designed and fabricated in 0.7-um InP double-heterojunction bipolar transistor (DHBT) technology. The driver part is based on Power DAC architecture which is integrated with the multiplexing stage composed of three 2:1 selectors. Up to 100 GS/s operation was validated and PAM-2, -4, -8 signals with high amplitude were measured. In particular, PAM-4 at 84 GBd and PAM-8 at 64 GBd operation was demonstrated with respectively 3.7-Vpp and 4-Vpp differential output signal. This compact driver circuit is characterized by the highest merit factor in terms of high amplitude and the transmission capacity for an electronically generated multilevel signal.

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