Offset-Compensation Systems for Multi-Gbit/s Optical Receivers

Research output: Contribution to book/Conference proceedings/Anthology/ReportChapter in book/Anthology/ReportContributedpeer-review

Abstract

Offset compensation (OC) systems are indispensable parts of multi-Gbit/s optical receiver (RX) frontends. Effects of offset are addressed in this chapter. The analytical expression for the highest lower-cut-off frequency of the OC with minimum impact on the sensitivity is found. Existing OC solutions are discussed. Then, a novel mixed-signal (MS) architecture is introduced which uses digital filtering of the signal, and current-digital-to-analog converters to compensate the static offset in the limiting amplifier. In the transimpedance amplifier both static and dynamic offset are compensated. By using two feedback loops and a continuous tracking the presented solution offers more functionality than other existing MS architectures. Three RX implementations, with RC, switched-capacitor (S-C) and with the MS-OC architectures, in the same 28 nm bulk-CMOS are compared quantitatively with measurements. The presented MS design reaches a lower-cut-off frequency of under 9 kHz, a dynamic range of over 1 mA, 3.2 μA residual input offset-current and it is compensating the RX via two feedback loops. The presented system offers a higher flexibility and functionality in implementation, as well as a very good compromise between area, precision and performance over the commonly used RC-filter and S-C filter based solutions.

Details

Original languageEnglish
Title of host publicationVLSI-SoC
EditorsCarolina Metzler, Ricardo Reis, Pierre-Emmanuel Gaillardon, Giovanni De Micheli, Carlos Silva-Cardenas
PublisherSpringer
Pages235-255
Number of pages21
ISBN (print)9783030532727
Publication statusPublished - 2020
Peer-reviewedYes

Publication series

SeriesIFIP Advances in Information and Communication Technology
Volume586 IFIP
ISSN1868-4238

Conference

Title2019 IFIP/IEEE 27th International Conference on Very Large Scale Integration
Abbreviated titleVLSI-SoC 2019
Conference number27
Duration6 - 9 October 2019
CityCuzco
CountryPeru

External IDs

ORCID /0000-0002-1851-6828/work/142256630

Keywords

Research priority areas of TU Dresden

Keywords

  • Limiting amplifier (LA), Lower-cut-off frequency, Mixed-signal control loop, Offset, Offset compensation, Optical receiver, Residual offset, Transimpedance amplifier (TIA)