Title :
Low power 12-bit SAR ADC for autonomous wireless sensors network interface
Author :
De Venuto, Daniela ; Castro, David Tio ; Ponomarev, Youri ; Stikvoort, Eduard
Author_Institution :
DEE Politec. di Bari, Bari, Italy
Abstract :
Design strategies for power effective and high resolution successive-approximation ADCs for autonomous multi-sensor systems are discussed. Specifically, an optimisation for lowest possible power consumption of comparators is addressed and evaluated using both simulations and measurements of a fabricated Si test-chip. The proposed design solution is capable to provide a 12-bit resolution at 50-kHz with only 0.1 muW power consumption on a 1.2-V supply. The achieved Figure-of-Merit is 165 fJ/convertion-step is, to our knowledge, the best ever reported. The complete ADC area is 0.35 mm2 in NXP 0.14 mum CMOS technology with only three metal layers.
Keywords :
CMOS integrated circuits; analogue-digital conversion; comparators (circuits); low-power electronics; network interfaces; sensor fusion; wireless sensor networks; CMOS technology; frequency 50 kHz; high-resolution successive-approximation ADC; low-power SAR ADC design; multisensor system; power 0.1 muW; size 0.14 mum; successive approximation register; test-chip fabrication; three-metal layer; voltage 1.2 V; wireless sensor network interface; word length 12 bit; Approximation algorithms; CMOS technology; Clocks; Digital control; Energy consumption; Logic; Sampling methods; Testing; Voltage; Wireless sensor networks;
Conference_Titel :
Advances in sensors and Interfaces, 2009. IWASI 2009. 3rd International Workshop on
Conference_Location :
Trani
Print_ISBN :
978-1-4244-4708-4
Electronic_ISBN :
978-1-4244-4709-1
DOI :
10.1109/IWASI.2009.5184780
