Title :
A low power oscillator based temperature sensor for RFID applications
Author :
Mohamad, Sarah ; Fang Tang ; Amira, Abbes ; Bermak, Amine ; Benammar, Mohieddine
Author_Institution :
Dept. of ECE, Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In this paper we present a temperature sensor based on a ring oscillator. The ring oscillator uses the CMOS thyristor delay element and has an extremely low power consumption of about 47nW at room temperature with a supply of 0.5V. Low power operation is achieved by eliminating the use of power hungry analog to digital converters (ADCs) at the sensor output. As shown the frequency increases linearly with temperature. The error in temperature sensing is around -1.8°C / +1°C with a resolution of 0.3°C. Simulation is carried out with Chartered Semiconductor´s 0.18μm technology. Owing to the extremely low power consumption, integration with a radio-frequency identification (RFID) tag is also possible.
Keywords :
CMOS analogue integrated circuits; analogue-digital conversion; low-power electronics; oscillators; radiofrequency identification; temperature sensors; thyristor circuits; ADC; CMOS thyristor delay element; RFID applications; RFID tag; chartered semiconductor technology; low power consumption; low power operation; low power oscillator based temperature sensor; power hungry analog to digital converters; radio-frequency identification tag; ring oscillator; sensor output; size 0.18 mum; temperature 293 K to 298 K; temperature sensing; voltage 0.5 V; CMOS integrated circuits; Delays; Oscillators; Power demand; Temperature dependence; Temperature sensors; Thyristors; CMOS temperature Sensor; Low Power Design;
Conference_Titel :
Quality Electronic Design (ASQED), 2013 5th Asia Symposium on
Conference_Location :
Penang
Print_ISBN :
978-1-4799-1312-1
DOI :
10.1109/ASQED.2013.6643563
