一种适用于能量收集系统的低功耗张弛振荡器  

A Low Power Relaxation Oscillator Suitable for Energy Harvesting System

作　　者：袁宇杰 韦保林[1] 韦雪明[1] 徐卫林[1] 段吉海[1] YUAN Yujie;WEI Baolin;WEI Xueming;XU Weilin;DUAN Jihai(Guangxi Key Laboratory of Precision Navigation Technology and Application,Guilin University of Electronic Technology,Guilin,Guangxi 541004,P.R.China)

机构地区：[1]桂林电子科技大学广西精密导航技术与应用重点实验室,广西桂林541004

出　　处：《微电子学》2023年第1期44-49,共6页Microelectronics

基　　金：国家自然科学基金地区基金项目(61861009,62064002);广西无线宽带通信与信号处理重点实验室主任基金资助项目(GXKL06200105)

摘　　要：为满足微小能量收集系统的低电压、低功耗应用需求,设计了一种低温度系数的低功耗、小面积的张弛振荡器。使用自偏置Cascode复合晶体管结构分别代替传统倍增电流偏置电路中的大电阻和振荡器核心电路中在比较器输入端生成电压参考的大电阻,实现低功耗,同时达到减小电路面积,提高集成度的目的。采用0.18μm CMOS工艺进行设计,仿真结果表明,该振荡器可在0.8~1.2 V的电源电压下正常工作,在工作频率为2.2 kHz时,功耗为30 nW,工作频率的温度系数TC可达1.03×10^(-4)/℃,芯片面积相对于同类电路至少减小了70%。To meet the application requirements of the weak energy harvesting system for low supply voltage and low power consumption,a low power and small area relaxation oscillator with a low temperature coefficient was designed.The structure of the self-cascode composite transistor was used to replace the large resistance in the traditional beta-multiplier-based current references and the large resistance in the oscillator core circuit that generates voltage reference at the comparator input,so as to reduce the circuit area and improve the integration while achieving low power consumption.Based on a 0.18μm CMOS IC process,the simulation results show that the oscillator can work normally at a supply voltage of 0.8-1.2V,with a frequency of 2.2kHz and a minimum power consumption of 30nW,achieving a temperature coefficient(TC)as low as 1.03×10^(-4)/℃,and the die area was reduced by at least 70%compared with previous research.

关 键 词：张弛振荡器 低温度系数 低功耗 

分 类 号：TN752[电子电信—电路与系统]