Digital Calibration of I/Q Mismatches

  • Kong-Pang Pun
  • José Epifânio da Franca
  • Carlos Azeredo-Leme
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 728)


In wireless receivers that employ analog quadrature demodulation, analog quadrature sampling or double quadrature sampling schemes as described in the previous chapter, gain and phase imbalances between I and Q channels always exist. The I/Q mismatch will produce the so-called “self-image” problem, that is, the folding of the positive frequency components of the received signal to the negative frequency range and vice versa. In a receiver which receives only one radio channel signal, the impact of the self-image is the lowering of the signal-to-noise ratio [1]. If I/Q mismatches are not severe, say, amplitude mismatch below 1 dB and phase error below 5°, the self-image is usually tolerable in such a single channel receiver.


Phase Error Residual Image Gain Error Image Rejection Gain Correction 
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Copyright information

© Springer Science+Business Media Dordrecht 2003

Authors and Affiliations

  • Kong-Pang Pun
    • 1
  • José Epifânio da Franca
    • 2
  • Carlos Azeredo-Leme
    • 3
  1. 1.The Chinese University of Hong KongHong KongChina
  2. 2.Chipldea Microelectronics S.A.Portugal
  3. 3.Instituto Superior TécnicoLisbonPortugal

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