LMS-Based Noise Leakage Calibration of Cascaded Continuous-Time $\Delta\Sigma$ Modulators

@article{Shu2010LMSBasedNL,
  title={LMS-Based Noise Leakage Calibration of Cascaded Continuous-Time \$\Delta\Sigma\$  Modulators},
  author={Yun-Shiang Shu and Junpei Kamiishi and Koji Tomioka and Koichi Hamashita and Bang-Sup Song},
  journal={IEEE Journal of Solid-State Circuits},
  year={2010},
  volume={45},
  pages={368-379}
}
In cascaded ΔΣ modulators (DSMs), the quantization noise of the earlier stage leaks to the output unless completely cancelled by the digital noise cancellation filter (NCF). The noise leakage is worse in the continuous-time (CT) implementation due to the poorly controlled time constant of the analog loop filter. A parameter-based continuous-time to discrete-time transform is developed to get an exact digital NCF, and the analog filter time constant is calibrated to match with the digital NCF. A… CONTINUE READING
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