IIP2 Calibration by Injecting DC Offset at the Mixer in a Wireless Receiver

@article{Elahi2007IIP2CB,
  title={IIP2 Calibration by Injecting DC Offset at the Mixer in a Wireless Receiver},
  author={Imtinan Elahi and Khurram Muhammad},
  journal={IEEE Transactions on Circuits and Systems II: Express Briefs},
  year={2007},
  volume={54},
  pages={1135-1139}
}
A major contributor to degraded input-referred second-order intercept point (IIP2) in integrated RF systems-on-chips is local oscillator (LO) leakage to the input of RF circuits. In this brief, we present a digital calibration technique for improving IIP2 by injecting controlled dc offset at the mixer output through a three-port network of switched-capacitor filters. The dc offset at mixer output gets up-converted to LO frequency at the input of RF circuits due to poor reverse isolation of the… CONTINUE READING
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An offset balancer, method of balancing an offset and a wireless receiver employing the balancer and the method

  • K. Muhammad, D. Leipold
  • USPTO serial No. 11/270,122, Nov. 9, 2005…
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