I/Q Imbalance of Two-path Ladder Filters

Author Info

Peter Kiss, Agere Systems, Allentown, PA
Vladimir I. Prodanov, Agere Systems, Allentown, PAFollow

Recommended Citation

Published in Proceedings of the 2004 IEEE International Symposium on Circuits and Systems: Vancouver, Canada, Volume 1, May 23, 2004, pages 1004-1007.

NOTE: At the time of publication, the author Vladimir Prodanov was not yet affiliated with Cal Poly.

The definitive version is available at https://doi.org/10.1109/ISCAS.2004.1328367.

Abstract

The frequency-(in)dependent I/Q imbalance of analog filters is a significant contributor to the tight noise budget of high-performance wireless applications, such as 802.11a wireless LANs. This paper proposes a “frequency-dependent” statistical I/Q-imbalance analysis method for two-path filters, which can be configured for both low-IF and zero-IF architectures. A 7-pole complex band-pass ladder filter is analyzed, and it shows large image rejection ratio (rms IMR > 43.7 dB for 3 σ). The same filter, but reconfigured as a pair of real low-pass filters, achieved about 13-dB less IMR. These results suggest a low-IF architectural choice to combat the I/Q imbalance of two-path filters.

Disciplines

Electrical and Computer Engineering

Copyright

2004 IEEE.

Publisher statement

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