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I/Q imbalance of two-path ladder filters

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2 Author(s)
Kiss, P. ; Dept. of Wireless Circuits Res., Agere Syst., Allentown, Netherlands ; Prodanov, V.

The frequency-(in)dependent I/Q imbalance of analog filters is 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 > 43.7dB for 3σ). The same filter, but reconfigured as a pair of real-low-pass filters, achieved about 13dB less IMR. These results suggest a low-IF architectural choice to combat the I/Q imbalance of two-path filters.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:1 )

Date of Conference:

23-26 May 2004