A 10 W On-Chip Switched Capacitor Voltage Regulator With Feedforward Regulation Capability for Granular Microprocessor Power Delivery
A 10 W On-Chip Switched Capacitor Voltage Regulator With Feedforward Regulation Capability for Granular Microprocessor Power Delivery
复制标题
具有前馈调节功能的 10 W 片上开关电容器稳压器，适用于精细微处理器供电
DOI：
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发表时间：
2017
影响因子：
6.7
通讯作者：
P. Francese
中科院分区：
文献类型：
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作者：
T. Andersen;F. Krismer;J. Kolar;T. Toifl;C. Menolfi;L. Kull;T. Morf;M. Kossel;M. Brandli;P. Francese
通过对微处理器功率输送进行每核调节的粒度功率输送有可能显著提高未来数据中心的能源效率。片上开关电容器转换器可以在给定高效率、高功率密度、快速响应时间和高输出功率转换器设计的情况下实现具有每核调节的这种粒度功率输送。本文详细介绍了一种采用深沟槽电容的32 nm SOI CMOS工艺实现的片上开关电容电压调节器。提出了一种新的可重构开关电容变换器前馈控制方法。前馈控制减小了瞬态负载阶跃之后的输出电压下降。这导致降低的最小微处理器电源电压，从而降低微处理器的总功耗。实现的片内开关电容电压调节器可从1.8 V输入提供0.7-1.1 V输出电压。它在3.2 W/mm 2功率密度下实现了85.1%的最大效率，具有改进的最小电源电压能力的亚纳秒响应时间，以及10 W的最大输出功率。对于850 mV的输出电压，前馈控制将所需的电压开销减少60 mV，用于从标称负载的10%到100%的瞬态负载阶跃。这可以将微处理器的总功耗降低7%。
Granular power delivery with per-core regulation for microprocessor power delivery has the potential to significantly improve the energy efficiency of future data centers. On-chip switched capacitor converters can enable such granular power delivery with per-core regulation given a high efficiency, high power density, fast response time, and high output power converter design. This paper details the implementation of an on-chip switched capacitor voltage regulator in a 32 nm SOI CMOS technology with deep trench capacitors. A novel feedforward control for reconfigurable switched capacitor converters is presented. The feedforward control reduces the output voltage droop following a transient load step. This leads to a reduced minimum microprocessor supply voltage, thereby reducing the overall power consumption of the microprocessor. The implemented on-chip switched capacitor voltage regulator provides a 0.7-1.1 V output voltage from 1.8 V input. It achieves a 85.1% maximum efficiency at 3.2 W/mm2 power density, a subnanosecond response time with improved minimum supply voltage capability, and a maximum output power of 10 W. For an output voltage of 850 mV, the feedforward control reduces the required voltage overhead by 60 mV for a transient load step from 10% to 100% of the nominal load. This can reduce the overall power consumption of the microprocessor by 7%.