基于最优小波包基改善高速长输信号的完整性

Improving singnal integrity in long high-speed circuit based on best wavelet packet basis

为了解决理想无损传输线理论在分析高速信号长距离输送时的不适用性的问题,将信号衰减因子引入高速长输信号的反射和串扰分析。围绕由不确定环境骚扰、反射和串扰噪声所引出的高频数字信号的完整性问题,通过对将自底向顶和深度优先相结合的最优小波包基搜索策略的探讨,采用数字仿真与实验数据相结合的方法,提出基于最优小波包基改善高速长输信号完整性的方法。数字仿真结果表明:最优小波包基方法消噪效果优于小波方法或普通小波包方法,可提高高频数字信号的边沿质量,有利于高速长输信号完整性的改善。

In order to solve the problem that the ideal transmission line theory is unsuitable in analyzing high-speed signal’s long distance transportation, this paper takes it into account that attenuating effect in analyzing the signal reflection and crosstalk. Moreover, in view of the signal integrity question drawed out by the uncertainty of environmental noise, reflection and crosstalk, discussed the fast searching algorithm of best wavelet packet basis （BWPB） combined depth-first search with traditional search strategy, this paper presents a new method to improve the signal integrity based on BWPB. The results of digital simulation show that adopting BWPB produces a better eliminate-noise effect compared with wavelet or ordinary wavelet packet analysis. This new method can enhance the border quality and the signal integrity of long high-speed digital signal.