A. Baldi

Publications (2)0 Total impact

• Conference Proceeding: Instrumentation system to improve ISFET behaviour

  S. Casans, A.E. Navarro, D. Ramirez, J.M. Espi, N. Abramova, A. Baldi
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  ABSTRACT: Solid state chemical sensors have many advantages over conventional glass electrodes, such as smaller size, faster response and lower cost. Nevertheless, the limitations imposed by their temporary drifts, thermal dependencies and hysteresis must be considered in these sensors' performance. These limitations are not so important in applications that do not require high precision. But in the case of biomedical applications they cannot be ignored. We introduce a new electronic conditioning circuit plus a virtual instrumentation that cancels or reduces these limitations. As result of the study, we can conclude that the new measurement method allows a 0.06 pH precision. The conditioning circuit maintains stable sensor feedback in an automatic way, independent of its temporary drifts and thermal dependencies.
  Instrumentation and Measurement Technology Conference, 2002. IMTC/2002. Proceedings of the 19th IEEE; 02/2002
• Article: Novel voltage-controlled conditioning circuit applied to the ISFETs temporary drift and thermal dependency

  S. Casans, A.E. Navarro, D. Ramı́rez, E. Castro, A. Baldi, N. Abramova
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  ABSTRACT: This paper describes a novel conditioning circuit applied to ion-sensitive field-effect transistors/membrane-ion-sensitive field-effect transistors (ISFETs/MEMFETs) sensors. The novel conditioning circuit allows the sensor polarization with the needed either voltage or current required in each application, thanks to two completely independent voltage-controlled blocks (current and voltage blocks). The control of the voltage block is the most critical point in our design because the voltage block maintains the sensor feedback stable, avoiding the thermal and temporary drifts of the sensor feedback.
  Sensors and Actuators B: Chemical.