TY - GEN
T1 - Locally shielded differential-paired lines with bend discontinuities for SI and EMI performances
AU - Kayano, Yoshiki
AU - Ohkoshi, Masashi
AU - Watabe, Takuya
AU - Inoue, Hiroshi
PY - 2014
Y1 - 2014
N2 - To provide the basic considerations for EM radiation from practical asymmetrical differential-paired lines with bend routing, this paper newly attempts to propose locally shielded differential-paired lines for establishing SI performance and suppressing imbalance component and EMI generated by differential-paired lines with bend (turnoff point) discontinuities. The conductive plane is placed on discontinuity region asymmetrically. The concept of locally shielded layout is based on compensation of phase-difference due to the bend discontinuities, by using electric-coupling between signal trace and a conductive plane for the shield. The proposed method is suitable for implementing on PCB, without changing layout of the differential-paired lines. To compare the effect of the locally shielded paired-lines on CM component, the Scd21, which is defined as the conversion from DM to CM, are evaluated. The significant suppression effectiveness of Scd21 in the case study is achieved below 1 GHz by locally shielded differential-paired lines. Consequently, the validity of the proposed locally shielded layout is demonstrated in the case study. It is demonstrated that the proposed locally shielded layout is suitable for improving the SI performance and suppressing the CM in the case study. This study has successfully reported the basic method for suppressing imbalance component of differential-paired lines with bend discontinuities.
AB - To provide the basic considerations for EM radiation from practical asymmetrical differential-paired lines with bend routing, this paper newly attempts to propose locally shielded differential-paired lines for establishing SI performance and suppressing imbalance component and EMI generated by differential-paired lines with bend (turnoff point) discontinuities. The conductive plane is placed on discontinuity region asymmetrically. The concept of locally shielded layout is based on compensation of phase-difference due to the bend discontinuities, by using electric-coupling between signal trace and a conductive plane for the shield. The proposed method is suitable for implementing on PCB, without changing layout of the differential-paired lines. To compare the effect of the locally shielded paired-lines on CM component, the Scd21, which is defined as the conversion from DM to CM, are evaluated. The significant suppression effectiveness of Scd21 in the case study is achieved below 1 GHz by locally shielded differential-paired lines. Consequently, the validity of the proposed locally shielded layout is demonstrated in the case study. It is demonstrated that the proposed locally shielded layout is suitable for improving the SI performance and suppressing the CM in the case study. This study has successfully reported the basic method for suppressing imbalance component of differential-paired lines with bend discontinuities.
KW - Bend (turnoff point)
KW - Differential-paired lines
KW - Electromagnetic interference
KW - Signal integrity
UR - http://www.scopus.com/inward/record.url?scp=84903704504&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84903704504&partnerID=8YFLogxK
U2 - 10.1109/ICEP.2014.6826726
DO - 10.1109/ICEP.2014.6826726
M3 - Conference contribution
AN - SCOPUS:84903704504
SN - 9784904090107
T3 - 2014 International Conference on Electronics Packaging, ICEP 2014
SP - 484
EP - 489
BT - 2014 International Conference on Electronics Packaging, ICEP 2014
PB - IEEE Computer Society
T2 - 2014 International Conference on Electronics Packaging, ICEP 2014
Y2 - 23 April 2014 through 25 April 2014
ER -