5-GHz optical front-end for active pixel applications in standard 0.35-μm CMOS

Mengxiong Li, Barrie Hayes-Gill, Matt Clark, Mark Fitter, Michael Geoffrey Somekh, Ian Harrison

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


A monolithically integrated, high speed optical front-end for optical sensing application in standard 0.35-μm CMOS technology is reported. The proposed receiver consists of an integrated photodiode, a transimpedance amplifier, a mixer, an IF amplifier and an output buffer. By treating the n-well in standard CMOS technology as a screening terminal to block the slow photo-generated bulk carriers and interdigitizing shallow p-junctions as the active region, the integrated photodiode operates up to several gigahertz with no process modification. With multi-inductive-series peaking technique, the improved regulated cascade (RGC) transimpedance amplifier achieves an experimentally measured -3 dB bandwidth of more than 6 GHz and a transimpedance gain of 51 dBΩ, which is the fastest reported TIA in CMOS 0.35-μm technology. The 5 GHz broadband mixer produces a conversion gain of 13 dB which greatly minimizes the noise contribution from the IF amplification stage. The optical front-end of the active pixel demonstrates a -3 dB bandwidth of 4.9 GHz while consuming a current of 40 mA from 3.3 V power supply. This work presents the highest bandwidth for fully integrated CMOS optical receivers reported to date.
Original languageEnglish
Title of host publicationSilicon Photonics II
Publication statusPublished - 24 May 2007
Externally publishedYes
EventSilicon Photonics II - San Jose, CA, United States
Duration: 22 Jan 200724 Jan 2007


ConferenceSilicon Photonics II
Country/TerritoryUnited States
CitySan Jose, CA


  • CMOS
  • Front-end
  • Optical
  • TIA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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