Subthreshold operation of Nauta's operational transconductance amplifier

Astria Nur Irfansyah, Andrew Nicholson, Julian Jenkins, Tara Julia Hamilton, Torsten Lehmann

    Research output: Chapter in Book / Conference PaperConference Paperpeer-review

    3 Citations (Scopus)

    Abstract

    This paper investigates the subthreshold operation of the inverter-based operational transconductance amplifier for the potential use in very low power data conversion systems. Circuit analysis and sizing strategies are presented, and a first order continuous-time delta-sigma modulator circuit is used as a case study to verify the performance of the amplifier when operating in subthreshold region. We demonstrate experimental results using a digitally configurable Nauta operational transconductance amplifier implemented in a 180nm CMOS process which shows up to 97.76 percent power reduction when 600mV is used instead of 1.8V as supply with better figure of merit and without significant signal-to-noise distortion ratio penalty highlighting its significant potential at subthreshold operation.
    Original languageEnglish
    Title of host publicationConference Proceedings: NEWCAS 2015: 13th IEEE International New Circuits and Systems Conference (NEWCAS), June 7-10 2015, Grenoble, France
    PublisherIEEE
    Number of pages4
    DOIs
    Publication statusPublished - 2015
    EventIEEE International New Circuits and Systems Conference -
    Duration: 7 Jun 2015 → …

    Conference

    ConferenceIEEE International New Circuits and Systems Conference
    Period7/06/15 → …

    Keywords

    • digital integrated circuits
    • inverters
    • operational amplifiers
    • transconductance

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