Cancellation of OpAmp Virtual Ground Imperfections by a Negative Conductance Applied to Improve RF Receiver Linearity

@article{Mahrof2014CancellationOO,
  title={Cancellation of OpAmp Virtual Ground Imperfections by a Negative Conductance Applied to Improve RF Receiver Linearity},
  author={Dlovan H. Mahrof and Eric A. M. Klumperink and Zhiyu Ru and Mark S. Oude Alink and Bram Nauta},
  journal={IEEE Journal of Solid-State Circuits},
  year={2014},
  volume={49},
  pages={1112-1124}
}
High linearity CMOS radio receivers often exploit linear V-I conversion at RF, followed by passive down-mixing and an OpAmp-based Transimpedance Amplifier at baseband. Due to nonlinearity and finite gain in the OpAmp, virtual ground is imperfect, inducing distortion currents. This paper proposes a negative conductance concept to cancel such distortion currents. Through a simple intuitive analysis, the basic operation of the technique is explained. By mathematical analysis the optimum negative… CONTINUE READING
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