An 802.11ax 4 × 4 high-efficiency WLAN AP transceiver SoC supporting 1024-QAM with frequency-dependent IQ calibration and integrated interference analyzer

Shusuke Kawai, Rui Ito, Kengo Nakata, Yutaka Shimizu, Motoki Nagata, Tomohiko Takeuchi, Hiroyuki Kobayashi, Katsuyuki Ikeuchi, Takayuki Kato, Yosuke Hagiwara, Yuki Fujimura, Kentaro Yoshioka, Shigehito Saigusa, Hiroshi Yoshida, Makoto Arai, Toshiyuki Yamagishi, Hirotsugu Kajihara, Kazuhisa Horiuchi, Hideki Yamada, Tomoya SuzukiYuki Ando, Kensuke Nakanishi, Koichiro Ban, Masahiro Sekiya, Yoshimasa Egashira, Tsuguhide Aoki, Kohei Onizuka, Toshiya Mitomo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A fully integrated 4 × 4 802.11abgn/ac/ax transceiver system-on-chip (SoC) with integrated interference analyzer and frequency-dependent in-phase and quadrature (IQ) (FD-IQ) calibration is presented. The FD-IQ technique helps meeting the extremely strict IQ imbalance requirement for 1-K quadratic-amplitude modulation (QAM). The pure current-mode TX baseband (BB) improves SNR to better than 50 dB, and a multi-mode local oscillator (LO) distribution circuit provides non-contiguous operation with the error vector magnitude (EVM) of less than -37 dB. The integrated interference analyzer achieves the highly reliable connection in the presence of the undesired signal and hence improves the frequency usage efficiency by identifying the wireless LAN (WLAN) and other signals in the 2G/5G band.

Original languageEnglish
Article number8528383
Pages (from-to)3688-3699
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Volume53
Issue number12
DOIs
Publication statusPublished - 2018 Dec
Externally publishedYes

Keywords

  • 80211ax
  • In-phase and quadrature (IQ) mismatch
  • calibration
  • error vector magnitude (EVM)
  • image rejection ratio (IRR)
  • wireless LAN (WLAN)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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