January 01, 2014

A large bandwidth differential cascode amplifier cell in InP DHBT for 100-Gb/s analog equalizer applications

  • Dupuy J.
  • Godin J.
  • Jorge F.
  • Konczykowska A.
  • Nodjiadjim V.
  • Ouslimani A.
  • Renato Lo Cigno
  • Riet M.

This paper reports the design, simulations and measurements of a differential cascode amplifier cell in InP DHBT. From transistor with fT/fmax reaching 370/340 GHz, this circuit is able to provide a bandwidth of more than 110 GHz, with a maximal differential gain of 9 dB at 90 GHz, and a total peaking of 11dB. This circuit constitutes a promising building block for analog equalizer structures dedicated to 100-Gb/s optical communication systems.

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