Transmit-receive cross-modulation distortion correction in a 5-6GHz full duplex quadrature balanced CMOS RF front-end

Nimrod Ginzberg, Tomer Gidoni, Dror Regev, Emanuel Cohen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this work, we propose an analysis, characterization, and correction of transmit-receive cross-modulation (CM) distortion in a full duplex quadrature balanced CMOS RF front-end around the carrier frequency of 5.2 GHz. A theoretical model of the CM mechanism stemming from instantaneous variations in the power amplifiers' output impedance is laid out and verified in measurement. A two-dimensional digital post-distortion (2D-DPoD) algorithm is employed to linearize the CM distorted receive signal, in conjunction with wideband digital RF and baseband self-interference cancellation. The system was measured in a simultaneous transmit-receive operation using 802.11ac VHT20 signals at 10 dBm RMS Tx power and -17 dBm Rx power and achieves total Tx-Rx isolation >66 dB. The digital SIC and 2D-DPoD correct Rx EVM by 16 dB to a value of -32.5 dB.

Original languageEnglish
Title of host publicationIMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1211-1214
Number of pages4
ISBN (Electronic)9781728168159
DOIs
StatePublished - Aug 2020
Externally publishedYes
Event2020 IEEE/MTT-S International Microwave Symposium, IMS 2020 - Virtual, Los Angeles, United States
Duration: 4 Aug 20206 Aug 2020

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
Volume2020-August
ISSN (Print)0149-645X

Conference

Conference2020 IEEE/MTT-S International Microwave Symposium, IMS 2020
Country/TerritoryUnited States
CityVirtual, Los Angeles
Period4/08/206/08/20

Keywords

  • 2D-DPD
  • CMOS
  • Cross-modulation distortion
  • Full duplex
  • Post-distortion
  • Power amplifiers
  • Quadrature balanced transmitter
  • RF front-end
  • Simultaneous transmit-receive

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