A power scalable SAR-ADC in 0.18μm-CMOS with 0.5V nano-watt operation

Ryota Sekimoto, Akira Shikata, Hiroki Ishikuro

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    13 Citations (Scopus)

    Abstract

    This paper presents an extremely low-power and low-voltage Analog-to-Digital Converter (ADC) for wireless sensor networks or medical implantable devices. Top plate sampling and bootstrap switch are used to realize ultra low-voltage (0.5V) operation. Configuration of capacitor array which can decrease the number of control bus lines are proposed to reduce the circuit area and power consumption. To further reduce the power consumption, optimal power supply voltages are determined independently for analog blocks and digital blocks considering the tradeoff between the speed and power. Test ADC chip fabricated in 0.18μm-CMOS process has achieved 0.5V, 6nW operation at sampling frequency of 0.4kS/s. The achieved effective number of bit (ENOB) is 7.19-bit. When the supply voltage is increased to 1V, the ADC operates at 820kS/s with power consumption of 30.9μW and ENOB of 7.41-bit.

    Original languageEnglish
    Title of host publicationProceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011
    Pages89-94
    Number of pages6
    DOIs
    Publication statusPublished - 2011 Aug 23
    Event2011 1st International Symposium on Access Spaces, ISAS 2011 - Yokohama, Japan
    Duration: 2011 Jun 172011 Jun 19

    Publication series

    NameProceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011

    Other

    Other2011 1st International Symposium on Access Spaces, ISAS 2011
    CountryJapan
    CityYokohama
    Period11/6/1711/6/19

    Keywords

    • bootstrap switch
    • low-power
    • low-voltage
    • medical implantable
    • sensor network
    • successive-approximation-register(SAR) ADC
    • top plate sampling

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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  • Cite this

    Sekimoto, R., Shikata, A., & Ishikuro, H. (2011). A power scalable SAR-ADC in 0.18μm-CMOS with 0.5V nano-watt operation. In Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011 (pp. 89-94). [5960926] (Proceedings of 2011 1st International Symposium on Access Spaces, ISAS 2011). https://doi.org/10.1109/ISAS.2011.5960926