Localized Stability Checking and Design of IC Power Delivery With Distributed Voltage Regulators
Localized Stability Checking and Design of IC Power Delivery With Distributed Voltage Regulators
复制标题
使用分布式稳压器进行 IC 供电的局部稳定性检查和设计
DOI：
10.1109/tcad.2013.2256393
复制
发表时间：
2013
影响因子：
2.9
通讯作者：
Peng Li
中科院分区：
文献类型：
--
作者：
Suming Lai;Boyuan Yan;Peng Li
将多个电压调节器放置在管芯上是实现分布式片内电压调节的有效方法，并且在抑制各种类型的电源噪声方面具有显著优势。然而，有源电压调节器与大型无源子网络之间的复杂交互可能使整个电力输送网络（PDN）不稳定，从而导致设计失败。虽然诸如相位裕度的传统稳定性测量不适用于具有大量环路的受管制PDN，但是由于给定PDN的高复杂性，对网络稳定性的强力分析可能是不切实际的。我们提出了一个混合稳定裕度的概念和相关的稳定性检查方法集成线性低压差稳压器（LDO）的PDN。由于理论上的严格性，所提出的方法在某种意义上是局部的，即整个网络的稳定性可以通过针对单个LDO局部定义的混合稳定性约束来有效地检查。本着同样的精神，我们提出了一种本地化的LDO设计方法，以独立的方式优化单个LDO，同时确保网络级的稳定性。还讨论了确保稳定性的LDO设计中涉及的关键电路级设计考虑因素和权衡。
Placing multiple voltage regulators onto the die is an effective way of enabling distributed on-chip voltage regulation and provides significant benefits in suppressing various types of power supply noise. However, the complex interactions between the active voltage regulators and the large passive subnetwork may render the complete power delivery network (PDN) unstable, leading to design failures. While traditional stability measures such as phase margin are not applicable to regulated PDNs that have a large number of loops, a brute-force analysis of network stability can be impractical due to the high complexity of a given PDN. We present a hybrid stability margin concept and the associated stability-checking method for PDNs with integrated linear low-dropout voltage regulators (LDOs). With theoretical rigor, the proposed approach is local in the sense that the stability of the entire network can be efficiently examined through a hybrid stability constraint that is defined locally for individual LDOs. In the same spirit, we propose a localized LDO design methodology that optimizes individual LDOs in a stand-alone manner while ensuring the network-level stability. Key circuit-level design considerations and tradeoffs involved in stability-ensuring LDO design are also discussed.