应用于睡眠定时器的纳瓦级功耗超低电压张弛振荡器  

Nanowatt voltage relaxation oscillator applied to sleep timers

作　　者：李振 王霖伟 杨建行 朱建华 杨伟涛 周荣 刘术彬 LI Zhen;WANG Linwei;YANG Jianhang;ZHU Jianhua;YANG Weitao;ZHOU Rong;LIU Shubin(School of Microelectronics,Xidian University,Xi’an 710000,China)

机构地区：[1]西安电子科技大学微电子学院,西安710000

出　　处：《集成电路与嵌入式系统》2024年第7期65-72,共8页Integrated Circuits and Embedded Systems

基　　金：中央高校基本科研业务费基金(XJSJ23046);西安电子科技大学创新基金(YJS2213)。

摘　　要：在物联网(IoT)系统中,为了节省功耗引入了电阻电容(RC)张弛振荡器。针对无补偿的传统RC振荡器频率容易受到电源和温度影响的问题,本文所采用的前向体偏置(Forward Body Biasing,FBB)技术降低了低电源电压数字缓冲器的温度漂移,进一步的,本文同时利用亚阈区金属-氧化物半导体场效应晶体管(MOSFET,简称MOS)泄漏电流补偿技术(Subthreshold Leakage Current,SLC)和泄漏电流抑制技术(Subthreshold Leakage Suppression,SLS)。相比于传统结构振荡器,温度稳定性提升了约38倍。本文基于65 nm CMOS工艺设计了一款RC张弛振荡器,在室温0.4 V的电源电压下,功耗为8.1 nW,工作频率为4.4 kHz,能量效率为1.84 nW/kHz。在-30~90℃的范围内,振荡器的温度稳定性为75.1 ppm/℃。In Internet of Things(IoT)systems,Resistance-Capacitance(RC)relaxation oscillator has been implemented to reduce power consumption.To address the issue that uncompensated traditional RC oscillators are susceptible to power supply and temperature influences,the Forward Body Biasing(FBB)technique is employed to reduce the temperature drift of the low supply voltage digital buffer.Additionally,leverage Subthreshold Leakage Current(SLC)compensation and Subthreshold Leakage Suppression(SLS)in high-temperature subthreshold MOS transistors are used.Compared to uncompensated oscillators,the temperature stability is enhanced by 38 times.A relaxation oscillator based on 65 nm CMOS is designed.With a power supply voltage of 0.4 V at room temperature,the power consumption is 8.1 nW,operating at a frequency of 4.4 kHz.The energy efficiency is calculated at 1.84 nW/kHz.Within the range of-30℃to 90℃,the temperature stability of the oscillator is measured at 75.1 ppm/℃.

关 键 词：电容电阻张弛振荡器 泄露电流补偿 前向体偏置 物联网 

分 类 号：TN43[电子电信—微电子学与固体电子学]