多主干鱼骨型时钟树结构的设计方法及优化

Design and Optimization of Multi-trunk Fishbone Clock Tree Structure

为了使鱼骨型时钟树这种先进的时钟结构应用到大尺寸集成电路设计当中,针对现有鱼骨型时钟树存在的局限性和不足,总结出新的多主干混合型鱼骨型时钟结构设计方法和具体实现步骤。提出一种消除伴随鱼骨型时钟树存在的串扰噪音,并且尽可能减少时钟抖动的方法。结果显示多主干混合型鱼骨型时钟树性能比传统鱼骨型时钟树时钟偏差减少大约30%,主干周围的串扰噪声几乎能够完全消除,时钟抖动有明显改善。将多主干鱼骨型时钟树结构应用在大尺寸集成电路设计当中,不仅能够减少时间偏差从而更好地收敛时序,同时还能够节约大量绕线资源、降低噪音。

To apply fishbone structure in some big size chips, on the weakness of existed fishbone clock structure, the thesis concluded a new multi-trunk fishbone clock structure and design steps. Then it proposed a way to eliminate crosstalk noise between nets, and reduce clock jitter.The result shows the clock skew from this new multi-trunk can improve about 30% and crosstalk can be removed the mostly. Applying the fishbone structure in big size chip can decrease clock skew to meet timing,meanwhile can save a lot of routing resource and lower noise.