Now showing items 1-20 of 55

    • A Closed-loop capacitance to pulse-width converter for single element capacitive sensors 

      Areekath, Lakshmi; George, Boby; Reverter Cubarsí, Ferran (2019)
      Conference report
      Open Access
      A novel closed-loop capacitance-to-pulse width converter (CPC) suitable for single element capacitive sensors that use sinusoidal excitation is presented in this paper. Its operation is realized using a new configuration ...
    • A closed-loop capacitance-to-frequency converter for single-element and differential capacitive sensors 

      Areekath, Lakshmi; George, Boby; Reverter Cubarsí, Ferran (2020-11-01)
      Article
      Open Access
      A novel closed-loop switched-capacitor(SC) capacitance-to-frequency converter (CFC) is presentedin this paper. The proposed CFC is capable of measuring from either a single-element or a differential capacitive sensor, ...
    • A compact Thévenin model for a rectenna and its application to an RF harvester with MPPT 

      Gasulla Forner, Manuel; Ripoll Vercellone, Edgar; Reverter Cubarsí, Ferran (Multidisciplinary Digital Publishing Institute (MDPI), 2019-04-06)
      Article
      Open Access
      This paper proposes a compact Thévenin model for a rectenna. This model is then applied to design a high-efficiency radio frequency harvester with a maximum power point tracker (MPPT). The rectenna under study consists of ...
    • A High-Efficiency RF Harvester with Maximum Power Point Tracking 

      Gasulla Forner, Manuel; Robert Sanxis, Francesc Josep; Jordana Barnils, José; Ripoll Vercellone, Edgar; Berenguer Sau, Jordi; Reverter Cubarsí, Ferran (Multidisciplinary Digital Publishing Institute (MDPI), 2018)
      Conference report
      Open Access
      This paper presents the implementation of a high-efficiency radiofrequency (RF) harvester, which consists of a rectenna and a maximum power point tracker (MPPT). The rectenna was characterized from -30 dBm to -10 dBm at ...
    • A microcontroller-based interface circuit for non-linear resistive sensors 

      Reverter Cubarsí, Ferran (2021)
      Article
      Open Access
      This article proposes a circuit based on a microcontroller unit (MCU) for the direct measurement and linearization of non-linear resistive sensors, such as thermistors. The measurement relies on an embedded digital timer ...
    • A novel general-purpose theorem for the analysis of linear circuits 

      Reverter Cubarsí, Ferran; Gasulla Forner, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
      Article
      Open Access
      A novel general-purpose theorem for the analysis of linear circuits is stated and proven in this brief. When applying the proposed theorem, any current (voltage) of interest is determined by finding first an equivalent ...
    • A novel measurement technique for DC voltage and current reducing the DMM loading effects 

      Torres, Emilio; Monzo, Carlos; Reverter Cubarsí, Ferran (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference report
      Open Access
      A novel technique for the measurement of DC voltage and current that reduces the loading effects of a digital multimeter is presented in this work. When the variable of interest is a current (voltage), instead of ...
    • A Simple direct microcontroller interface for capacitively-coupled resistive sensors 

      Areekath, Lakshmi; George, Boby; Reverter Cubarsí, Ferran (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Open Access
      A novel approach to interface capacitively-coupled resistive sensors directly to a microcontroller is presented in this paper. The existing schemes for the measurement of the resistance of a sensing element ...
    • A tutorial on thermal sensors in the 200th anniversary of the seebeck effect 

      Reverter Cubarsí, Ferran (2021-10)
      Article
      Open Access
      Two noteworthy events associated to the physics of thermal sensors were demonstrated and announced in 1821, exactly two hundred years ago. The first event was the Seebeck effect, which led to the development of thermocouples. ...
    • An auto-balancing capacitance-to-pulse-width converter for capacitive sensors 

      Areekath, Lakshmi; George, Boby; Reverter Cubarsí, Ferran (2021-01)
      Article
      Open Access
      A novel auto-balancing capacitance-to-pulse- width converter (CPC) that uses sinusoidal excitation, and operates in a closed-loop configuration, is presented in this paper. Unlike most of the existing CPCs, the ...
    • An Extended study on an interference-insensitive switched capacitor CDC 

      Areekath, Lakshmi; Reverter Cubarsí, Ferran; George, Boby (2019-09-15)
      Article
      Restricted access - publisher's policy
      A new Switched Capacitor (SC) Capacitance-to-Digital Converter (CDC) is presented in this paper. Its output exhibits a high-level of insensitivity to interference, by virtue of the conversion mechanism itself. The proposed ...
    • Analysis of a direct microcontroller interface for capacitively coupled resistive sensors 

      Areekath, Lakshmi; George, Boby; Reverter Cubarsí, Ferran (2021-01-01)
      Article
      Open Access
      A novel approach to directly interface a capacitively coupled resistive sensor to a microcontroller is presented in this article. The existing measurement schemes for such sensors are complex. In addition, the coupling ...
    • BPF-based thermal sensor circuit for on-chip testing of RF circuits 

      Altet Sanahujes, Josep; Barajas Ojeda, Enrique; Mateo Peña, Diego; Billong, Alexandre; Aragonès Cervera, Xavier; Perpiñà Gilabet, Xavier; Reverter Cubarsí, Ferran (Multidisciplinary Digital Publishing Institute (MDPI), 2021-01)
      Article
      Open Access
      A new sensor topology meant to extract figures of merit of radio-frequency analog integrated circuits (RF-ICs) was experimentally validated. Implemented in a standard 0.35 µm complementary metal-oxide-semiconductor (CMOS) ...
    • Buck converter for low-power PV modules: A Comparative Study 

      Reverter Cubarsí, Ferran; Gasulla Forner, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2018)
      Conference report
      Open Access
      Autonomous sensors that harvest energy from the environment usually employ a dc/dc converter to regulate the operating voltage of the energy transducer around its maximum power point (MPP). In this context, this work ...
    • Characterization of MOSFET temperature sensors for on-chip dynamic thermal measurements 

      Reverter Cubarsí, Ferran; Perpinyà, Xavier; Leon, Javier; Vellvehi, Miquel; Jordà, Xavier; Altet Sanahujes, Josep (2015)
      Conference lecture
      Open Access
    • Demodulating AM square signals via a digital timer for sensor applications 

      Reverter Cubarsí, Ferran; Gasulla Forner, Manuel (2020-05-01)
      Article
      Open Access
      This paper evaluates theoretically and experimentally the performance of a timer-based demodulator applied to low-frequency amplitude-modulated (AM) square signals coming from sensor circuits. The demodulator extracts the ...
    • Design considerations for a CMOS Lab-on-Chip microheater array to facilitate the in vitro thermal stimulation of neurons 

      Reverter Cubarsí, Ferran; Prodromakis, Themis; Liu, Yan; Georgiou, Pantelis; Nikolic, Konstantin; Constandinou, Tim (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      This paper identifies and addresses key design considerations and trade-offs in the implementation of a CMOS high-resolution microheater array for Lab-on-Chip (LOC) applications. Specifically, this is investigated in the ...
    • Differential inductive sensor-to-microcontroller interface circuit 

      Kokolanski, Zivko; Gasulla Forner, Manuel; Reverter Cubarsí, Ferran (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      This paper proposes a low-cost interface circuit for differential inductive sensors where the sensor is directly connected to a microcontroller unit (MCU) without any active intermediate electronics in between. The timer ...
    • Direct inductive sensor-to-microcontroller interface circuit 

      Kokolanski, Zivko; Jordana Barnils, José; Gasulla Forner, Manuel; Dimcev, Vladimir; Reverter Cubarsí, Ferran (2015-04-01)
      Article
      Open Access
      This paper proposes and analyses a microcontroller-based interface circuit for inductive sensors with a variable self-inductance. Besides the microcontroller (mu C) and the sensor, the circuit just requires an external ...
    • Efficiency Optimization in Burst-Mode Buck DC/DC Converters for Sensor Nodes 

      Reverter Cubarsí, Ferran; Glaser, Chris; Gasulla Forner, Manuel (2018-07-08)
      Article
      Open Access
      In autonomous sensor nodes, switching dc/dc converters are usually employed to power the sensor electronics and also to maintain the operating voltage of an energy transducer around its maximum power point. In such a ...