ARAÚJO, A. L. A.; http://lattes.cnpq.br/5887640488734439; ARAÚJO, Arthur Luiz Alves.
Résumé:
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.