Title :
Low power smart sensor for accurate temperature measurements
Author :
De Venuto, Daniela ; Stikvoort, Eduard
Author_Institution :
DEE, Politec. di Bari, Bari, Italy
Abstract :
A low power smart temperature sensor followed by an SC amplifier, buffer stage and a 12bit Successive-Approximation analogue-digital converter (ADC) for autonomous multi-sensor systems is presented. The proposed design is accurate within 0.1°C over the temperature range of -55°C to 125°C. A PTAT source like the one presented in was used as a high accuracy temperature sensor. The read-out enables a differential reading of the reference and actual temperature. The succeeding ADC digitizes the output with a bit-clock of 50-kHz. The power consumption with a 1.2V supply is 0.1μW. The ADC has a Figure-of-Merit of 66 fJ/conversion-step. The whole system is implemented in the NXP CMOS 0.14μm technology. The die area is 0.27 mmp2 and the whole system consumes less than 16μW.
Keywords :
CMOS integrated circuits; amplifiers; analogue-digital conversion; buffer circuits; intelligent sensors; low-power electronics; sensor fusion; temperature measurement; temperature sensors; NXP CMOS technology; PTAT source; SC amplifier; autonomous multisensor system; bit-clock; buffer stage; figure-of-merit; frequency 50 kHz; low power smart temperature sensor; power 0.1 muW; power consumption; size 0.14 mum; successive-approximation ADC; successive-approximation analogue-digital converter; temperature -55 degC to 125 degC; temperature 0.1 degC; temperature measurement; voltage 1.2 V; word length 12 bit; Capacitors; Clocks; Simulation; Temperature measurement; Temperature sensors; Transistors; Voltage measurement;
Conference_Titel :
Advances in Sensors and Interfaces (IWASI), 2011 4th IEEE International Workshop on
Conference_Location :
Savelletri di Fasano
Print_ISBN :
978-1-4577-0623-3
Electronic_ISBN :
978-1-4577-0622-6
DOI :
10.1109/IWASI.2011.6004690
