A 5–50 GHz sige BiCMOS linear transimpedance amplifier with 68 dbΩ differential gain towards highly integrated quasi-coherent receivers

Guillermo Silva Valdecasa, Jose A. Altabas, Monika Kupska, Jesper Bevensee Jensen, Tom K. Johansen

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Abstract

Quasi-coherent optical receivers have recently emerged targeting access networks, offering improved sensitivity and reach over direct-detection schemes at the expense of a higher receiver bandwidth. Higher levels of system integration together with sufficiently wideband front-end blocks, and in particular high-speed linear transimpedance amplifiers (TIAs), are currently demanded to reduce cost and scale up receiver data rates. In this article, we report on the design and testing of a linear TIA enabling high-speed quasi-coherent receivers. A shunt-feedback loaded common-base topology is adopted, with gain control provided by a subsequent Gilbert cell stage. The circuit was fabricated in a commercial 130 nm SiGe BiCMOS technology and has a bandpass characteristic with a 3 dB bandwidth in the range of 5–50 GHz. A differential transimpedance gain of 68 dBΩ was measured, with 896 mVpp of maximum differential output swing at the 1 dB compression point. System experiments in a quasi-coherent receiver demonstrate an optical receiver sensitivity of −30.5 dBm (BER = 1 × 10−3) at 10 Gbps, and −26 dBm (BER = 1 × 10−3) at 25 Gbps. The proposed TIA represents an enabling component towards highly integrated quasi-coherent receivers.
Original languageEnglish
Article number2349
JournalElectronics (Switzerland)
Volume10
Issue number19
Number of pages12
ISSN2079-9292
DOIs
Publication statusPublished - 2021

Keywords

  • High-speed circuit design
  • Optical receivers
  • SiGe BiCMOS
  • Transimpedance amplifier

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