Taming the Stability-Constrained Performance Optimization Challenge of Distributed On-Chip Voltage Regulation
Taming the Stability-Constrained Performance Optimization Challenge of Distributed On-Chip Voltage Regulation
复制标题
应对分布式片上电压调节的稳定性受限性能优化挑战
DOI：
10.1109/tcad.2018.2855173
复制
发表时间：
2019
影响因子：
2.9
通讯作者：
E. Sánchez
中科院分区：
文献类型：
--
作者：
Xin Zhan;Peng Li;E. Sánchez
分布式片上电压调节有希望解决许多IC功率输送挑战。然而，有源调节器和周围的寄生无源RLC网络之间的复杂的相互作用引起稳定性问题。最近开发的混合稳定性技术提供了一个独特的机会，以应付稳定的分布式片上调节，使有效的本地化系统设计。然而，混合稳定性定理（HST）固有的保守性导致了在稳定性评估中的大量悲观主义，从而导致过度设计。在本文中，上述挑战是通过扩展HST与最佳频率相关的系统划分技术，可以显着减少稳定性分析中的悲观主义量。为了把所提出的方法在一个坚实的理论基础上，我们证明了分区技术消除了保守性，而不改变物理系统和关键的理论性质的分区块保持在一定的约束条件下。在此基础上，开发了一种使用自动化设计流程的有效的确保稳定性的功率输送设计方法，以显着提高功率输送性能。在一个大的设计空间内，所提出的方法确保了稳定性，并提高了系统性能高达53%，测量的品质因数（FOM）相比，经典的相位裕度设计方法，它不提供任何保证的稳定性。此外，平均而言，我们的方法将FOM提高了113%，而与参考混合稳定性方法相比，功耗降低了11%。
Distributed on-chip voltage regulation is promising for addressing many IC power delivery challenges. However, complex interactions between active regulators and the surrounding parasitic passive RLC network cause stability concern. The recently developed hybrid stability technique provides a unique opportunity for coping with stability of distributed on-chip regulation and enabling efficient localized system design. However, the inherent conservativeness of the hybrid stability theorem (HST) leads to large pessimism in stability evaluation and hence causes overdesign. In this paper, the above challenge is addressed by extending the HST with an optimal frequency-dependent system partitioning technique which can significantly reduce the amount of pessimism in stability analysis. To put the proposed approach on a firm theoretical footing, we prove that the partitioning technique removes the conservativeness without altering the physical system and key theoretical properties of the partitioned blocks are maintained under certain constraints. Upon this, an efficient stability-ensuring power delivery design methodology using an automated design flow is developed to significantly improve power delivery performance. Within a large design space, the proposed approach ensures stability and improves system performance by up to 53%, measured by a figure of merit (FOM), when compared to the classical phase margin design approach, which provides no guarantee of stability. Furthermore, on average our approach boosts the FOM by 113% while consuming 11% less power compared to a reference hybrid stability approach.