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 0.1C 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 0.14m technology. The die area is 0.27 mmp2 and the whole system consumes less than 16μW.
|Autori interni:||DE VENUTO, Daniela|
|Titolo:||Low Power Smart Sensor for Accurate Temperature Measurements|
|Data di pubblicazione:||2011|
|Nome del convegno:||4th IEEE International Workshop on Advances in Sensors and Interfaces, IWASI 2011|
|Digital Object Identifier (DOI):||10.1109/IWASI.2011.6004690|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|