用于超高频标签芯片的低功耗高稳定时钟电路  

Design of low power process and temperature stable clock generator for UHF RFID tags

作　　者：许仕龙[1] 魏恒[1] 陈燕[2] XU Shilong;WEI Heng;CHEN Yan(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang Hebei 050081,China;College of Physics Science and Information Engineering,Hebei Normal University,Shijiazhuang Hebei 050024,China)

机构地区：[1]中国电子科技集团公司第54研究所,河北石家庄050081 [2]河北师范大学物理科学与信息工程学院,河北石家庄050024

出　　处：《太赫兹科学与电子信息学报》2018年第2期357-362,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：提出一种适用于无源超高频射频识别(UHF RFID)标签芯片的时钟产生电路。电路使用N型金属-氧化物-半导体(NMOS)栅极电压取代了复杂的比较器电路作为比较电平,精简了电路结构,降低了电路功耗,减小了版图面积;使用二极管方式连接的NMOS管作温度及工艺补偿感应管,利用其栅压变化控制充放电电流,使其在不同工艺角下,当温度在较大范围内变化时,均能实现输出频率稳定。采用中芯国际0.18μm工艺进行仿真验证,结果表明:当电源电压为1 V,基准电流为130 n A时,电路功耗仅为447 n W;在工艺角由ss变化到ff的过程中,输出频率偏差不超过2.43%,;温度在-40~90℃范围变化时,输出频率偏差小于0.99%,适合无源射频识别标签芯片使用。A clock generation circuit that is suitable for passive Ultra High Frequency Radio Frequency Identification(UHF RFID)tag chips is proposed.Different from the traditional relaxation oscillator structure,the N-Metal Oxide Semiconductor(NMOS)gate voltage is utilized as a comparison reference level,without the need of complex comparator circuit.The circuit structure is simplified,which greatly reduces the power consumption and reduces the layout area.At the same time,the NMOS transistor is adopted for temperature and process compensation,the gate voltage of which is utilized to control the charge and discharge current.The output frequency is stable without traditional clock calibration.The circuit is designed in a standard Semiconductor Manufacturing International Corporation(SMIC)0.18μm Complementary Metal Oxide Semiconductor(CMOS)technology,with the condition of 1 V power supply voltage and 130 nA reference current,and the power consumption of this circuit is only 447 nW.When the process corners are changed from ss to ff,the output frequency deviation is no more than 2.43%,and the temperature changed from-40℃to 90℃,the output frequency deviation is less than 2.62%,so the circuit is suitable for passive RFID tag chips usage.

关 键 词：低功耗 弛豫振荡器 环形振荡器 时钟生成 超高频射频识别 

分 类 号：TN202[电子电信—物理电子学]