Frequency-Selective I/Q Mismatch Calibration of Wideband Direct-Conversion Transmitters

  title={Frequency-Selective I/Q Mismatch Calibration of Wideband Direct-Conversion Transmitters},
  author={Lauri Anttila and Mikko Valkama and Markku Renfors},
  journal={IEEE Transactions on Circuits and Systems II: Express Briefs},
The current trend in building low-cost yet flexible radio transceivers is to use the so-called direct-conversion principle, which is based on complex (I/Q) up- and down conversions. Such transceivers are, however, sensitive to mismatches between the I and Q branches. These mismatches are unavoidable in any practical implementation, and result in finite attenuation of the mirror frequencies. In addition to the mirror-frequency interference problem, I/Q mismatches can severely compromise the… 

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