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Low Power High-Resolution Smart Temperature Sensor for Autonomous Multi-Sensor System

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2 Author(s)
De Venuto, D. ; Dept. of Electr. & Electron. Eng., Politec. di Bari, Bari, Italy ; Stikvoort, E.

A low power temperature sensor followed by a switched capacitor amplifier, a buffer stage, and a 12-bit successive approximation analogue-to-digital converter (ADC) for autonomous multi-sensor systems is presented. The proposed design is accurate within 0.01°C from -55°C to 125°C . A proportional to absolute temperature source was used as a temperature sensor. The read-out enables a differential reading of a reference and actual temperature. The subsequent ADC digitizes the output signal. The ADC has a figure-of-merit of 66 fJ/conversion-step at a bit-clock of 50 kHz. The system is implemented in an NXP CMOS 0.14-μm technology. The die area is 0.27 mm2, and the whole system consumes less than 16 μW. Design and measurements are presented.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 12 )