Diode-based IQ imbalance estimation in direct conversion transmitters

被引：4

作者：

Li, Wei ^{[1
]}

Zhang, Yue ^{[1
]}

Wang, Jin ^{[2
]}

Huang, Li-ke ^{[2
]}

Xiong, Jian ^{[3
]}

Maple, Carster ^{[1
]}

机构：

[1] Univ Bedfordshire, Inst Res Applicable Comp, Luton LU1 3JU, Beds, England

[2] Aeroflex, Stevenage SG1 2AN, Herts, England

[3] Shanghai Jiao Tong Univ, Shanghai 200030, Peoples R China

来源：

ELECTRONICS LETTERS | 2014年 / 50卷 / 05期

关键词：

QUADRATURE MODULATORS;

D O I：

10.1049/el.2013.3819

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：409 / 410

页数：2

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