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 [1] 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.

Low Power Smart Sensor for Accurate Temperature Measurements

DE VENUTO, Daniela;
2011

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 0.1C over the temperature range of 55°C to 125°C. A PTAT source like the one presented in [1] 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.
4th IEEE International Workshop on Advances in Sensors and Interfaces, IWASI 2011
978-1-4577-0623-3
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11589/18748
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