14nm工艺下基于H-Tree和clock mesh混合时钟树的研究与实现

摘要

在数字集成电路设计中,时钟信号是数据传输的基准,时钟信号作为数字芯片内部转换频率最高和布线距离最长的信号,也是数字芯片功耗的重要组成部分.为了优化数字芯片的功耗、功能和稳定性,在GF14 nm工艺下对时钟树进行优化设计,提出一种H-Tree和clock mesh相结合的混合时钟树结构的设计方法,通过clock mesh和clock spine的布局优化整体时钟树的性能和稳定性.仿真结果表明,该混合时钟树能够结构显著提升时钟树性能,有效减少布线长度、时钟偏移以及传播延迟,降低PVT等环境参数的影响.%In digital integrated circuit design,the clock signal is the benchmark data transmission.In order to optimize the power consumption,function and stability of digital chip,this article designed the clock tree under GF14 nm process and put forward the combination of H-Tree and clock mesh design method of the clock tree structure innovatively.Through the layout of clock mesh and clock spine,clock tree has the optimization of overall performance and stability.Finally,analysis of prime time shows that the hybrid clock tree structure obviously improved the clock tree performance,effectively reducing the length of the wiring,the clock offset and propagation delay,reducing the influence of PVT.