Condicionador de sinais para múltiplos sensores: aplicações em RFID.

Abstract

Radio Frequency Identification (RFID) technology is being widely used for identification of objects, people and animals. Furthermore, with new sensing technologies advances, such as carbon nanotubes, several studies have been developed to make viable the sensing applications using RFID technology. The carbon nanotube sensor is one of the most promising for that, it has very reduced dimensions and a very low consumption. Set in a partnership between the Instrumentation and Metrology Scientific Laboratory (LIMC) at UFCG and Center for Semiconductor Components (CCS) at UNICAMP, this dissertation aimed to develop a programmable gain ultra-low power signals conditioner. With these features, the designed circuit can be used with different carbon nanotube resistive sensors. Therefore, the classical typology of an instrumentation amplifier with three operational amplifiers operating in the subthreshold region was chosen. The entire conditioning circuit was integrated in 0.13 μm CMOS technology except carbon nanotube resistive sensors and biasing resistors, which are coupled externally to the integrated circuit. The consumption of the designed circuit and settling time were 3 μW and 150 μS, respectively.