High-Linearity bottom-plate mixing technique with switch sharing for N-path filters/mixers

Yuan-Ching Lien, Eric A.M. Klumperink, Bernard Tenbroek, Jon Strange, Bram Nauta

    Research output: Contribution to journalArticleAcademicpeer-review

    28 Citations (Scopus)
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    A four-path filter/mixer for surface acoustic wave (SAW)-less frequency division duplex (FDD) radio receivers is proposed, targeting high linearity and compression requirements. A bottom-plate mixing technique improves linearity by reducing the gate-source voltage modulation of the MOSFET switches. Differential bottom-plate mixing allows for switch sharing which halves the effective switch resistance to reduce drain-source voltage modulation. The first four-path switch-RC filter stage with bottom-plate mixing and a shared switch renders 2nd-order voltage-domain RF-bandpass filtering around the LO frequency. Extra out-of-band rejection is implemented combined with V – I conversion and zero-IF frequency down-conversion in the second cross-coupled switch-RC four-path stage, which offers a low-ohmic high-linearity current path for out-of-band interferers. A prototype chip fabricated in a 28-nm CMOS technology achieves an out-of-band IIP3 of +44 dBm, IIP2 of +90 dBm and blocker 1-dB gain-compression point of +13 dBm for a blocker frequency offset of 80 MHz. At this offset frequency, the measured desensitization is only 0.6 dB for a 0-dBm blocker, and 3.5 dB for a 10-dBm blocker at 0.7-GHz LO (i.e., 6- and 9-dB blocker noise figure). The chip consumes 38–96 mW for LO-frequencies of 0.1–2 GHz and occupies an active area of 0.49 mm 2
    Original languageEnglish
    Article number8538881
    Pages (from-to)323-335
    Number of pages13
    JournalIEEE journal of solid-state circuits
    Issue number2
    Publication statusPublished - 1 Feb 2019


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    • Saw-Less radio receivers in CMOS

      Lien, Y-C., 3 Oct 2018, Enschede: University of Twente. 157 p.

      Research output: ThesisPhD Thesis - Research UT, graduation UT

      Open Access
      729 Downloads (Pure)

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