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A Digital Controller Assisted Flexible Auto-tuning Method for Continuous-time Filters

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Abstract

A novel auto-tuning method for the integrated continuous-time filter is proposed in this paper. On the one hand, an off-chip digital controller is adopted here to decrease the on-chip hardware as well as to increase the efficiency and the flexibility of the auto-tuning strategy. As a result, both the calibration and the programmability of the cut-off frequency can be realized by software, meanwhile some non-idealities of the circuit can also be compensated by software. On the other hand, the on-chip auto-tuning circuit is designed based on the master-slave architecture, where a novel and simple master circuit is adopted with digital input and output interfaces, thus providing convenient connections for the controller without the ADC or DAC devices. With the PCB technology, a 6th-order active-RC filter with the proposed auto-tuning method is also implemented to verify the validity and the flexibility of this method.

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Acknowledgments

We really appreciate the comments and the suggestions from the editor and the reviewers. This work is partially supported by Project in the Science & Technology Pillar Program of Tianjin under Grant (12ZCZDJC35500) and Natural Science Foundation of Tianjin under Grant (13JCQNJC01300).

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Authors and Affiliations

  1. Tianjin Key Laboratory of Film Electronic and Communication Device, Tianjin University of Technology, Tianjin , 300384, China

    Kun Li, Jianfu Teng, Xiuwei Xuan, Jin Lu, Daolian Jiang & Yuanxin Huang

  2. School of Mechanical Engineering, Tianjin University of Technology, Tianjin , 300384, China

    Qing Liu

Authors
  1. Kun Li
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  2. Jianfu Teng
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  3. Qing Liu
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  4. Xiuwei Xuan
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  5. Jin Lu
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  6. Daolian Jiang
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  7. Yuanxin Huang
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Corresponding author

Correspondence to Xiuwei Xuan.

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Li, K., Teng, J., Liu, Q. et al. A Digital Controller Assisted Flexible Auto-tuning Method for Continuous-time Filters. Circuits Syst Signal Process 33, 2401–2417 (2014). https://doi.org/10.1007/s00034-014-9765-x

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  • DOI: https://doi.org/10.1007/s00034-014-9765-x

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