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Diode-based IQ imbalance estimation in direct conversion transmitters

  • Wei Li
    ,
  • Yue Zhang
    ,
  • Jin Wang
    ,
  • Li-Ke Huang
    ,
  • Jian Xiong
    ,
  • Carsten Maple
Research Output: Contribution to journal Article Peer-review

Abstract

Direct conversion transmitters are widely used in wireless systems for their inherent features of being simple and low cost. In this architecture, the inphase (I branch) and quadrature signal (Q branch) will be unconverted to the RF frequency band by quadrature modulation. However, the drawback of the direct conversion architecture is that it is sensitive to IQ imbalance caused by the impairment of analogue devices in I and Q branches. It then results in interferences in mirror frequencies which degrades the signal quality. Therefore, the accurate measurement of IQ imbalance is crucial. A diode-based method to measure the broadband IQ imbalance is proposed which does not need additional measurement instruments. Measurement results show the effectiveness of this method

Publication Information

Output type

Research Output: Contribution to journal Article Peer-review

Original language

English

Pages from-to (Number of pages)

Pages 409-412

Journal (Volume, Issue Number)

Electronics Letters (Volume 50, Issue 5)

Publication milestones

  • Published - 01/02/2014

Publication status

Published - 01/02/2014

ISSN

0013-5194

External Publication IDs

  • handle.net: 10547/335930
  • Scopus: 84896955121

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