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.


Electrical and Computer Engineering

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