DocumentCode :
1512524
Title :
A Sub- 
W Embedded CMOS Temperature Sensor for RFID Food Monitoring Application
Author :
Law, Man Kay ; Bermak, Amine ; Luong, Howard C.
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Volume :
45
Issue :
6
fYear :
2010
fDate :
6/1/2010 12:00:00 AM
Firstpage :
1246
Lastpage :
1255
Abstract :
An ultra-low power embedded CMOS temperature sensor based on serially connected subthreshold MOS operation is implemented in a 0.18 μm CMOS process for passive RFID food monitoring applications. Employing serially connected subthreshold MOS as sensing element enables reduced minimum supply voltage for further power reduction, which is of utmost importance in passive RFID applications. Both proportional-to-absolute-temperature (PTAT) and complimentary-to-absolute-temperature (CTAT) signals can be obtained through proper transistor sizing. With the sensor core working under 0.5 V and digital interfacing under 1 V, the sensor dissipates a measured total power of 119 nW at 333 samples/s and achieves an inaccuracy of + 1/-0.8°C from - 10°C to 30°C after calibration. The sensor is embedded inside the fabricated passive UHF RFID tag. Measurement of the sensor performance at the system level is also carried out, illustrating proper sensing operation for passive RFID applications.
Keywords :
UHF integrated circuits; field effect MMIC; food processing industry; intelligent sensors; low-power electronics; monitoring; radiofrequency identification; temperature sensors; RFID food monitoring application; complimentary-to-absolute-temperature signal; digital interfacing; passive UHF RFID tag; power reduction; proportional-to-absolute-temperature signal; serially connected subthreshold MOS operation; size 0.18 mum; sub-μW embedded CMOS temperature sensor; ultra-low-power application; CMOS image sensors; CMOS process; Calibration; Monitoring; Passive RFID tags; Power measurement; Radiofrequency identification; Temperature sensors; UHF measurements; Voltage; CMOS temperature sensor; embedded sensor; passive RFID tag; ultra-low-power application;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2010.2047456
Filename :
5482527
Link To Document :
