A 1-4 GHz 4x4 MIMO receiver with 4 reconfigurable orthogonal beams for analog interference rejection

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    Abstract—A highly reconfigurable multi-beam MIMO receiver with 4 RF inputs and 4 outputs is proposed, allowing for digital MIMO but also analog interference rejection by spatial notch filtering through 4 reconfigurable orthogonal beams. A segmented constant-Gm vector modulator with improved interference tolerance and RF frequency range is proposed, allowing current-domain beamforming before I-V conversion by a transimpedance amplifier. A 1-4 GHz 22 nm FD-SOI prototype chip achieves >29 spatial notch suppression for in-band interference signals. In the notches, an IIP3 of +17 dBm and in-band B1dB of -12 dBm is achieved at 44.5 dB gain. Sub-3dB system noise figure is achievable in the corner points of vector modulator constellation. On the circle points, noise figure degrades about 2.5 dB. However, in-band, in-notch B1dB and IIP3 improve by 32dB and 43dB, respectively. The chip of 0.52 mm2 active area consumes 75-115mW at an LO-frequency of 1-4 GHz from a 0.8V supply.
    Original languageEnglish
    Title of host publicationIEEE Radio Frequency Integrated Circuits Symposium 2019 (RFIC)
    Place of PublicationBoston, Massachusetts, US
    Number of pages4
    ISBN (Electronic)978-1-7281-1702-7
    Publication statusPublished - 4 Jun 2019
    EventIEEE Radio Frequency Integrated Circuits Symposium 2019 - Boston Convention and Exhibition Center, Boston, United States
    Duration: 2 Jun 20194 Jun 2019


    ConferenceIEEE Radio Frequency Integrated Circuits Symposium 2019
    Abbreviated titleRFIC 2019
    CountryUnited States



    • spatial filtering
    • analog beamforming
    • multiple-input–multiple-output (MIMO)
    • receiver
    • vector modulator
    • interference rejection

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