基于HyperLynx的LPDDR4信号完整性分析与优化  

Analysis and Optimization of LPDDR4 Signal Integrity Based on HyperLynx

作　　者：刘跃成 甄国涌[1] 储成群[1] 单彦虎[1] 石建华 LIU Yuecheng;ZHEN Guoyong;CHU Chengqun;SHAN Yanhu;SHI Jianhua(National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan 030051;Xi'an Ziguo Micro Technology Co.,Ltd.,Xi'an 710065)

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051 [2]西安子国微科技有限公司,西安710065

出　　处：《舰船电子工程》2023年第3期69-74,共6页Ship Electronic Engineering

摘　　要：针对LPDDR4高速信号设计布线时容易存在的反射、串扰等信号完整性问题,从阻抗匹配、能量场作用、传输线耦合的角度进行理论分析,通过HyperLynx软件对影响LPDDR4信号传输质量的关键性因素进行定量仿真,根据仿真结果给出减小LPDDR4信号失真的优化方法,包括控制传输线阻抗、调整驱动端端接电阻值、调整接收端ODT电阻值、调整传输线间距和修改传输线耦合线长等。仿真结果表明优化设计后单根信号线在5Gbps速率下眼宽138.797ps,眼高361.1mV;差分信号线4Gbps速率下眼宽237.243ps、眼宽575.7mV。有效地解决了LPDDR4高速信号的信号完整性问题,一定程度上为LPDDR4的应用设计提供了参考依据。Aiming at the signal integrity problems such as reflection and crosstalk that are easy to exist in the design and wir⁃ing of LPDDR4 high-speed signal,this paper theoretically analyzes them from the perspective of impedance matching,energy field effect and transmission line coupling,quantitatively simulates the key factors affecting the transmission quality of LPDDR4 signal through HyperLynx software,and gives the optimization method to reduce the distortion of LPDDR4 signal according to the simula⁃tion results,including controlling the transmission line impedance,adjusting the termination resistance value at the driving,adjust⁃ing the ODT resistance value at the receiving,adjusting the transmission line spacing and modifying the coupling line length of the transmission line.The simulation results show that the eye width of the optimized single ended transmission line is 138.797ps and the eye height is 361.1mV at 5Gbps rate.The eye width of the differential transmission line is 237.243ps and 575.7mV at 4Gbps rate,which effectively solves the signal integrity problem of LPDDR4 high-speed signal,and provides a reference for the applica⁃tion design of LPDDR4 to a certain extent.

关 键 词：LPDDR4 信号完整性 眼图 

分 类 号：TN402[电子电信—微电子学与固体电子学]