A passive UHF RFID tag chip with a dual-resolution temperature sensor in a 0.18μm standard CMOS process  

作　　者：冯鹏 章琦 吴南健 

机构地区：[1]State Key Laboratory for Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2011年第11期139-147,共9页半导体学报（英文版）

基　　金：supported by the National High-Tech Research and Development Program of China(No.2008AA010703);the National Natural Science Foundation of China(No.60976023)

摘　　要：This paper presents a passive EPC Gen-2 UHF RFID tag chip with a dual-resolution temperature sensor. The chip tag integrates a temperature sensor, an RF/analog front-end circuit, an NVM memory and a digital base- band in a standard CMOS process. The sensor with a low power sigma-delta （NA） ADC is designed to operate in low and high resolution modes. It can not only achieve the target accuracy but also reduce the power consumption and the sensing time. A CMOS-only RF rectifier and a single-poly non-volatile memory （NVM） are designed to realize a low cost tag chip. The 192-bit-NVM tag chip with an area of 1 mm2 is implemented in a 0.18-#m standard CMOS process. The sensitivity of the tag is -10.7 dBm/-8.4 dBm when the sensor is disabled/enabled. It achieves a maximum reading/sensing distance of 4 m/3.1 m at 2 W EIRR The inaccuracy of the sensor is -0.6 ℃/0.5 ℃ （-1.0 ℃/1.2 ℃） in the operating range from 5 to 15 ℃ in high resolution mode （-30 to 50 ℃ in low resolution mode）. The resolution of the sensor achieves 0.02 ℃ （0.18 ℃） in high （low） resolution mode.This paper presents a passive EPC Gen-2 UHF RFID tag chip with a dual-resolution temperature sensor. The chip tag integrates a temperature sensor, an RF/analog front-end circuit, an NVM memory and a digital base- band in a standard CMOS process. The sensor with a low power sigma-delta （NA） ADC is designed to operate in low and high resolution modes. It can not only achieve the target accuracy but also reduce the power consumption and the sensing time. A CMOS-only RF rectifier and a single-poly non-volatile memory （NVM） are designed to realize a low cost tag chip. The 192-bit-NVM tag chip with an area of 1 mm2 is implemented in a 0.18-#m standard CMOS process. The sensitivity of the tag is -10.7 dBm/-8.4 dBm when the sensor is disabled/enabled. It achieves a maximum reading/sensing distance of 4 m/3.1 m at 2 W EIRR The inaccuracy of the sensor is -0.6 ℃/0.5 ℃ （-1.0 ℃/1.2 ℃） in the operating range from 5 to 15 ℃ in high resolution mode （-30 to 50 ℃ in low resolution mode）. The resolution of the sensor achieves 0.02 ℃ （0.18 ℃） in high （low） resolution mode.

关 键 词：RFID temperature sensor PASSIVE UHF TAG 

分 类 号：TP212.11[自动化与计算机技术—检测技术与自动化装置] TP391.44[自动化与计算机技术—控制科学与工程]