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Common-mode gain reduction technique and its applications

Authors

  • Nawatt Silawan,

    Non-member
    1. Department of Communications and Integrated Systems, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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  • Nicodimus Retdian,

    Member
    1. Global Edge Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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  • Shigetaka Takagi

    Member, Corresponding author
    1. Department of Communications and Integrated Systems, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
    • Department of Communications and Integrated Systems, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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Abstract

This paper proposes a common-mode gain reduction technique and a new approach for a balanced-type system design. Two design examples of a balanced-type operational transconductance amplifier and a balanced-type filter are given. The proposed scheme employs the proposed common-mode gain reduction technique together with the common-mode feedback (CMFB) network, which is used only to set a bias, to meet requirements of common-mode rejection. Compared with the conventional method, which uses the CMFB that has a higher gain than the one used in the proposed scheme, the proposed method shows reduction in design complexities and relaxation of the stability conditions. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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