On-Dual In-line Memory Module (DIMM) Low-Pass Filter (LPF) using Via Stubs for Enhancing Signal Integrity

2022 IEEE 31st Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS) Pub Date : 2022-10-09 DOI:10.1109/EPEPS53828.2022.9947177

Seungjin Lee, Jonghoon J. Kim, Jinseong Yun, Hee-Jea Cho, Youngho Lee, Kyoungsun Kim, Sungjoon Park, Jeonghyeon Cho, H. Song

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Abstract

A novel on-dual in-line memory module (on-DIMM) low-pass filter (LPF) using via stubs is proposed to enhance signal integrity. Proposed on-DIMM LPF implemented with existing via stubs not only eliminates the via stub effects, but also enhances the signal quality due to its low-pass characteristics without additional manufacturing processes and costs. For verification, both time- and frequency-domain simulation results of proposed DQ signal line with on-DIMM LPF are shown and compared with conventional DQ signal line. Proposed on-DIMM LPF exhibits 0.67 dB improvements at 2.8 GHz (nyquist frequency of 5.6 Gbps) shows relatively flat and improved insertion loss. Simulated eye height is improved for 29 mV and 20 mV and eye width is improved for 4.2 ps (0.02 UI) and 3.6 ps (0.02 UI) respectively at 4.8 Gbps and 5.6 Gbps. Finally, measurements verification with test board of on-DIMM LPF is also conducted and shows improvements in insertion loss and eye diagram

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双路直列内存模块(DIMM)低通滤波器(LPF)使用过孔存根增强信号完整性

为了提高信号的完整性，提出了一种新型的on-dual in-line memory module (on-DIMM)低通滤波器。利用现有的过孔存根实现的on-DIMM LPF不仅消除了过孔存根效应，而且由于其低通特性而无需额外的制造工艺和成本，从而提高了信号质量。为了验证这一点，给出了该DQ信号线的时域和频域仿真结果，并与传统DQ信号线进行了比较。所提出的on-DIMM LPF在2.8 GHz(奈奎斯特频率为5.6 Gbps)下表现出0.67 dB的改进，插入损耗相对平稳且有所改善。模拟眼高度提高29 mV和20 mV和眼睛的宽度提高4.2 ps (UI) 0.02和3.6 ps (0.02 UI)分别为4.8 Gbps, 5.6 Gbps。最后，在测试板上进行了测量验证，显示了插入损耗和眼图的改进

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2022 IEEE 31st Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS)

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