JSSC 2014第11期Power Management40nmBuck ConverterNeural Network Accelerator

A 0.6 V Input CCM/DCM Operating Digital Buck Converter in 40 nm CMOS

提出一种40nm CMOS工艺的0.6V输入降压转换器，采用CCM/DCM自适应控制提高效率。

40nm CMOS, 0.6V输入, 0.3-0.55V输出, 峰值效率94%

降压转换器低电压CMOS无线传感器网络能效优化

▸创新点1：CCM/DCM自适应控制器（系统创新） - 该控制器根据负载情况自动选择连续导通模式（CCM）或断续导通模式（DCM），显著提升了电源效率，在10 µA输出电流下效率提升高达20%。

▸创新点2：双模体偏置零交叉检测器（电路创新） - 采用正向体偏置和零体偏置双模式设计，支持在低电源电压和正常电源电压下实现DCM操作，扩展了工作电压范围。

▸创新点3：超低功耗迟滞电压检测器（电路创新） - 专为体偏置模式选择设计，具有极低功耗特性，优化了系统能效，峰值效率达到94%。

▸创新点4：40 nm CMOS工艺集成（工艺创新） - 在40 nm CMOS工艺中实现了0.6 V输入、0.3–0.55 V输出的降压转换器，适用于低电压低功耗无线传感器网络系统。

Abstract

This paper presents a 0.6 V input, 0.3–0.55 V output buck converter in 40 nm CMOS, for low-voltage low-power wire- less sensor network systems. A low power CCM/DCM controller of the buck converter enables automatic selection of DCM or CCM operation depending on load situ ation, therefore improving the power efﬁciency. A dual-mode-body-biased (DMBB) zero-crossing detector with both forward body bias mode and zero body bias mode is designed to enable DCM operation with both low supply voltage and normal supply voltage. An ultra-low-power hysteresis voltage detector is proposed for body bias modes selection. The proposed buck converter achieves a peak ef ﬁciency of 94% wit h an output current range of 50 µA to 10 mA. Thanks to the DCM operation, the ef ﬁciency at an output current of 10 µA is improved by 20% and 9%, with an output voltage of 0.35 V and 0.5 V , respectively.