Design of an Embedded CMOS Temperature Sensor for Passive RFID Tag Chips

Sensors

Fangming Deng²  Yigang He¹  Bing Li¹  Lihua Zhang²  Xiang Wu²  Zhihui Fu²  Lei Zuo¹ 

[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; E-Mails:;School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China; E-Mails:

关键词: temperature sensor;    RFID tag;    CMOS process;    phase-locked loop;   

DOI  :  10.3390/s150511442

来源: mdpi

【 摘 要 】

This paper presents an ultra-low embedded power temperature sensor for passive RFID tags. The temperature sensor converts the temperature variation to a PTAT current, which is then transformed into a temperature-controlled frequency. A phase locked loop (PLL)-based sensor interface is employed to directly convert this temperature-controlled frequency into a corresponding digital output without an external reference clock. The fabricated sensor occupies an area of 0.021mm² using the TSMC 0.18 1P6M mixed-signal CMOS process. Measurement results of the embedded sensor within the tag system shows a 92 nW power dissipation under 1.0 V supply voltage at room temperature, with a sensing resolution of 0.15 °C/LSB and a sensing accuracy of −0.7/0.6 °C from −30 °C to 70 °C after 1-point calibration at 30 °C.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.