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Design of low distortion active inductor and its applications

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Abstract

This paper proposes a novel distortion reduction technique for active inductors. A bias current of a MOSFET, which acts as transconductor in an active inductor, is controlled to reduce a distortion of a active inductor. When an input voltage increases, the bias current is decreased by a control circuit. As a result of this control, transconductance of the MOSFET remains constant. An active inductor using this technique is free from distortion caused by a transconductance variation of a MOSFET. The proposed technique is applied to two different conventional active inductors and novel low distortion active inductors are derived. Computer simulations show that distortion of the proposed active inductor is very low. The proposed low distortion active inductors are applied to a second order bandpass filter and a voltage controlled oscillator. Thanks to the proposed technique, distortion of these circuits are reduced and their performance is improved.

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Acknowledgements

This work is supported by VLSI Design and Education Center (VDEC), the University of Tokyo in collaboration with Synopsys, Inc. and Cadence Design Systems, Inc.

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Authors and Affiliations

  1. University of Yamanashi, 4-3-11, Takeda, Kofu, Yamanashi, Japan

    Takahide Sato

  2. Koito Manufacturing Co., LTD, 500, Kitawaki, Shimizu-ku, Shizuoka, Japan

    Toshihiro Ito

Authors
  1. Takahide Sato
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  2. Toshihiro Ito
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Correspondence to Takahide Sato.

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Sato, T., Ito, T. Design of low distortion active inductor and its applications. Analog Integr Circ Sig Process 75, 245–255 (2013). https://doi.org/10.1007/s10470-012-9955-z

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  • DOI: https://doi.org/10.1007/s10470-012-9955-z

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