A 1.0-to-4.0GHz 65nm CMOS Four-Element Beamforming Receiver Using a Switched-Capacitor Vector Modulator with Approximate Sine Weighting via Charge Redistribution

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    6 Downloads (Pure)

    Abstract

    Phased-array receivers provide two major benefits over single-antenna receivers. Their signal-to-noise ratio (SNR) doubles for each doubling in the number of elements, resulting in extended range. Secondly, interferers can be rejected in the spatial domain for increased link robustness. These arrays can be implemented by phase shifting and summing the signals from antenna elements with uniform spacing. For accurate interference rejection, a phase shifter with uniform phase steps and constant amplitude is desired. Several types of continuous-time phase shifters have been published, e.g. using injection locking, phase selection and vector modulation. This paper proposes a phased-array receiver architecture with a discrete-time vector modulator that takes advantage of the high linearity and good matching of switched-capacitor circuits, which are highly compatible with advanced CMOS. A simple charge redistribution circuit is presented that performs a rational approximation of the sine and cosine needed for the vector modulator weights.
    Original languageEnglish
    Title of host publicationIEEE International Solid-State Circuits Conference Digest of Technical Papers, ISSCC 2011
    Place of PublicationPiscataway
    PublisherIEEE
    Pages64-66
    Number of pages3
    ISBN (Print)978-1-61284-303-2
    DOIs
    Publication statusPublished - 21 Feb 2011
    EventIEEE International Solid-State Circuits Conference, ISSCC 2011 - San Francisco, United States
    Duration: 20 Feb 201124 Feb 2011

    Conference

    ConferenceIEEE International Solid-State Circuits Conference, ISSCC 2011
    Abbreviated titleISSCC
    CountryUnited States
    CitySan Francisco
    Period20/02/1124/02/11

    Keywords

    • METIS-278755
    • Capacitors
    • CMOS integrated circuits
    • IR-77958
    • EWI-20420
    • Clocks
    • Phase modulation
    • Phase shifters
    • Receivers
    • Mixers

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