Format

Send to

Choose Destination
Sensors (Basel). 2015 May 18;15(5):11442-53. doi: 10.3390/s150511442.

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

Author information

1
School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China. dengfm1980@sina.cn.
2
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China. dengfm1980@sina.cn.
3
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China. 18655136887@163.com.
4
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China. libinghnu@163.com.
5
School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China. lhzhang@ecjtu.edu.cn.
6
School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China. zgxiangyu@163.com.
7
School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China. fuzhihui@sohu.com.
8
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China. 18655118171@126.com.

Abstract

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 0.021 mm2 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.

KEYWORDS:

CMOS process; RFID tag; phase-locked loop; temperature sensor

Supplemental Content

Full text links

Icon for Multidisciplinary Digital Publishing Institute (MDPI) Icon for PubMed Central
Loading ...
Support Center