A 1024-QAM Capable WLAN Receiver with -56.3dB Image Rejection Ratio Using Self-Calibration Technique

Shusuke KAWAI  Toshiyuki YAMAGISHI  Yosuke HAGIWARA  Shigehito SAIGUSA  Ichiro SETO  Shoji OTAKA  Shuichi ITO  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.7   pp.457-463
Publication Date: 2018/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.457
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
WLAN,  1024-QAM,  calibration,  IQ mismatch,  image rejection ratio,  EVM,  

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This paper presents a 1024-QAM OFDM signal capable WLAN receiver in 65nm CMOS technology. Thermal noise-based IQ frequency-independent mismatch correction and IQ frequency-dependent mismatch correction with baseband loopback are proposed for the self-calibration in the receiver. The measured image rejection ratio of the self-calibration is -56.3dB. The receiver achieves the extremely low EVM of -37.1dB even with wide channel bandwidth of 80MHz and has the ability to receive the 1024-QAM signal. The result indicates that the receiver is extendable for the 802.11ax compliant receiver that supports a higher density modulation scheme of MIMO.