A method for compensating imbalance component of asymmetrical differential-paired lines due to turnoff point for SI and EMI performances
A method for compensating imbalance component of asymmetrical differential-paired lines due to turnoff point for SI and EMI performances
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DOI：
10.1109/isemc.2014.6899027
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Y. Kayano;M. Ohkoshi;H. Inoue
中科院分区：
文献类型：
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作者：
Y. Kayano;M. Ohkoshi;H. Inoue
对于差分信号系统，由于在断开点（90度转弯）处的不连续性（所谓的弯曲），不能建立理想的平衡或对称拓扑，因此，激励不平衡分量。因此，同时满足SI和EMI性能的方法和几何结构是必不可少的。为了给不对称差分对线的不平衡分量补偿和电磁辐射抑制方法的实现提供基础考虑，对关断点不连续差分对线的不平衡分量和电磁干扰进行了实验研究和数值模拟。作为典型布线，准备了不同布局的差分对线路供讨论。在该方法中，在断开点处的成对线之间的距离是窄的，从而补偿了线1和线2之间的长度差。因此，可以实现通过补偿长度差来抑制不平衡分量和通过更窄的间隔来抑制EMI。首先从SI性能的角度讨论了混合模散射参数。其次，从电磁干扰的角度讨论了PCB附近的电场和磁场的频率响应。仿真结果表明，该方法能够有效地改善开关电流特性，抑制电磁干扰。本研究成功地报道了具有截止点的差分偶线不平衡分量的基本特性。
For differential-signaling system, the ideal balance or symmetrical topology cannot be established due to discontinuities at turnoff point (90-degree turn), so called bending, and hence, an imbalance component is excited. Therefore methodology and geometrical-structure for satisfying both SI and EMI performances are indispensable. In order to provide basic considerations for the realization of methods for compensating the imbalance component and suppressing the EM radiation from asymmetrical differential-paired lines, the imbalance component and EMI from the differential-paired lines with discontinuities at turnoff point were studied experimentally and with numerical modeling. The differential-paired lines with different layouts were prepared for the discussion as typical routing. In the method, the distance between the paired lines at turnoff point is narrow, and hence the difference of length between Line 1 and 2 is compensated. Therefore the suppression of imbalance component by compensating the difference of the length and suppression of EMI by narrower separation can be achieved. Firstly the mixed-mode scattering parameters are discussed, from view point of SI performance. Secondly, frequency responses of electric-field and magnetic-field near a PCB are discussed, from view point of EMI. It is demonstrated that the proposed method is suitable for improving the SI performance and suppressing the EMI. This study has successfully reported the basic characteristics of imbalance component of differential-paired lines with turnoff point.