Analysis of a CMC (Common Mode Choke) Insertion Loss and Common Mode Current Characteristics in a Balanced Transmission Line with a CMC Inserted

Osamu MAKINO; Yoshifumi SHIMOSHIO; Hiroaki KOGA; Masamitsu TOKUDA; Tsuyoshi IDEGUCHI

Analysis of a CMC (Common Mode Choke) Insertion Loss and Common Mode Current Characteristics in a Balanced Transmission Line with a CMC Inserted

Osamu MAKINO, Yoshifumi SHIMOSHIO, Hiroaki KOGA, Masamitsu TOKUDA, Tsuyoshi IDEGUCHI

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For common-mode noise current reduction, a CMC (Common Mode Choke) is widely used in signal transmission line circuits consisting of a ground and two conductors (a balanced transmission line). However, a common-mode noise current reduction characteristic is not clearly analyzed yet in the case that a CMC is inserted in a balanced transmission line. In this paper we propose the calculation method of CMC insertion losses and derive an equation to analyze the common-mode current characteristics of a balanced transmission line with a CMC inserted. The analyzed frequency range is from 100 kHz to 100 MHz. We conclude that in the frequency range up to 30 MHz: (1) the proposed insertion loss calculation method is useful for analyzing CMC insertion losses in differential-mode and in common-mode; (2) the derived circuit equation can be applied for analyzing the common-mode current characteristics of a balanced transmission line locally unbalanced with conditions of a CMC inserted; (3) the proposed calculation method may give the expected results that a CMC should be placed in a signal source side of an unbalanced point of a pair-cable for reduction of common-mode currents; and (4) if it is placed in a terminal (or load) side of an unbalanced point, there is no effect, or rather common-mode currents are increased by the insertion of a CMC.

Publication: IEICE TRANSACTIONS on Communications Vol.E86-B No.7 pp.2162-2170

Publication Date: 2003/07/01

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Type of Manuscript: PAPER

Category: Electromagnetic Compatibility(EMC)

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Osamu MAKINO, Yoshifumi SHIMOSHIO, Hiroaki KOGA, Masamitsu TOKUDA, Tsuyoshi IDEGUCHI, "Analysis of a CMC (Common Mode Choke) Insertion Loss and Common Mode Current Characteristics in a Balanced Transmission Line with a CMC Inserted" in IEICE TRANSACTIONS on Communications, vol. E86-B, no. 7, pp. 2162-2170, July 2003, doi: .
Abstract: For common-mode noise current reduction, a CMC (Common Mode Choke) is widely used in signal transmission line circuits consisting of a ground and two conductors (a balanced transmission line). However, a common-mode noise current reduction characteristic is not clearly analyzed yet in the case that a CMC is inserted in a balanced transmission line. In this paper we propose the calculation method of CMC insertion losses and derive an equation to analyze the common-mode current characteristics of a balanced transmission line with a CMC inserted. The analyzed frequency range is from 100 kHz to 100 MHz. We conclude that in the frequency range up to 30 MHz: (1) the proposed insertion loss calculation method is useful for analyzing CMC insertion losses in differential-mode and in common-mode; (2) the derived circuit equation can be applied for analyzing the common-mode current characteristics of a balanced transmission line locally unbalanced with conditions of a CMC inserted; (3) the proposed calculation method may give the expected results that a CMC should be placed in a signal source side of an unbalanced point of a pair-cable for reduction of common-mode currents; and (4) if it is placed in a terminal (or load) side of an unbalanced point, there is no effect, or rather common-mode currents are increased by the insertion of a CMC.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e86-b_7_2162/_p

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@ARTICLE{e86-b_7_2162,
author={Osamu MAKINO, Yoshifumi SHIMOSHIO, Hiroaki KOGA, Masamitsu TOKUDA, Tsuyoshi IDEGUCHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Analysis of a CMC (Common Mode Choke) Insertion Loss and Common Mode Current Characteristics in a Balanced Transmission Line with a CMC Inserted},
year={2003},
volume={E86-B},
number={7},
pages={2162-2170},
abstract={For common-mode noise current reduction, a CMC (Common Mode Choke) is widely used in signal transmission line circuits consisting of a ground and two conductors (a balanced transmission line). However, a common-mode noise current reduction characteristic is not clearly analyzed yet in the case that a CMC is inserted in a balanced transmission line. In this paper we propose the calculation method of CMC insertion losses and derive an equation to analyze the common-mode current characteristics of a balanced transmission line with a CMC inserted. The analyzed frequency range is from 100 kHz to 100 MHz. We conclude that in the frequency range up to 30 MHz: (1) the proposed insertion loss calculation method is useful for analyzing CMC insertion losses in differential-mode and in common-mode; (2) the derived circuit equation can be applied for analyzing the common-mode current characteristics of a balanced transmission line locally unbalanced with conditions of a CMC inserted; (3) the proposed calculation method may give the expected results that a CMC should be placed in a signal source side of an unbalanced point of a pair-cable for reduction of common-mode currents; and (4) if it is placed in a terminal (or load) side of an unbalanced point, there is no effect, or rather common-mode currents are increased by the insertion of a CMC.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - Analysis of a CMC (Common Mode Choke) Insertion Loss and Common Mode Current Characteristics in a Balanced Transmission Line with a CMC Inserted
T2 - IEICE TRANSACTIONS on Communications
SP - 2162
EP - 2170
AU - Osamu MAKINO
AU - Yoshifumi SHIMOSHIO
AU - Hiroaki KOGA
AU - Masamitsu TOKUDA
AU - Tsuyoshi IDEGUCHI
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E86-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2003
AB - For common-mode noise current reduction, a CMC (Common Mode Choke) is widely used in signal transmission line circuits consisting of a ground and two conductors (a balanced transmission line). However, a common-mode noise current reduction characteristic is not clearly analyzed yet in the case that a CMC is inserted in a balanced transmission line. In this paper we propose the calculation method of CMC insertion losses and derive an equation to analyze the common-mode current characteristics of a balanced transmission line with a CMC inserted. The analyzed frequency range is from 100 kHz to 100 MHz. We conclude that in the frequency range up to 30 MHz: (1) the proposed insertion loss calculation method is useful for analyzing CMC insertion losses in differential-mode and in common-mode; (2) the derived circuit equation can be applied for analyzing the common-mode current characteristics of a balanced transmission line locally unbalanced with conditions of a CMC inserted; (3) the proposed calculation method may give the expected results that a CMC should be placed in a signal source side of an unbalanced point of a pair-cable for reduction of common-mode currents; and (4) if it is placed in a terminal (or load) side of an unbalanced point, there is no effect, or rather common-mode currents are increased by the insertion of a CMC.
ER -