Recent Submissions

  • Micro air vehicles energy transportation for a wireless power transfer system 

    Polo Cantero, José; Hontecillas Guinart, Lluís; Izquierdo Pérez, Ignacio; Casas Piedrafita, Óscar (2019-10-22)
    Article
    Open Access
    The aim of this work is to demonstrate the feasibility use of an Micro air vehicles (MAV) in order to power wirelessly an electric system, for example, a sensor network, using low-cost and open-source elements. To achieve ...
  • Cost-effective autonomous sensor for the long-term monitoring of water electrical conductivity of crop fields 

    Serrano Finetti, Roberto Ernesto; Aliau Bonet, Carles; López Lapeña, Oscar; Pallàs Areny, Ramon (2019-10-01)
    Article
    Restricted access - publisher's policy
    Salinity is a key parameter determining water quality. In agriculture, irrigation water with high salinity levels impacts plant growth and yield negatively hence there is a need to monitor it and irrigate with fresh water ...
  • A Fully Differential Synchronous Demodulator for AC Signals 

    González Landaeta, Rafael; Cota Ruiz, Juan; Sifuentes, Ernesto; Díaz, José; Casas Piedrafita, Óscar (2019-02-22)
    Article
    Restricted access - publisher's policy
    A novel fully differential (FD) demodulator is presented. Using different design strategies, the circuit can be used for processing amplitude-modulated (AM) signals obtained from impedance measurements or coming from ...
  • Comments on “A novel high input impedance front-end for capacitive biopotential measurement” 

    Pallàs Areny, Ramon (Springer, 2019-12-13)
    Article
    Open Access
    A front-end for biopotential sensing in wearable medical devices has been recently proposed which is claimed to provide 100 GOinput impedance by manually matching two resistor pairs in a positive- and a negative-feedback ...
  • Common mode electronic noise in differential circuits 

    Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon (2019-07-01)
    Article
    Restricted access - publisher's policy
    Differential circuits are assumed to reject common-mode noise yet no parameter is available to describethat rejection as the Common Mode Rejection Ratio (CMRR) applies only to deterministic signals, not torandom noise. We ...
  • A novel low-cost smart leaf wetness sensor 

    Hornero Ocaña, Gemma; Gaitán Pitre, Jorge Eliécer; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon (2017-12-01)
    Article
    Open Access
  • Solar energy radiation measurement with a low–power solar energy harvester 

    López Lapeña, Oscar; Pallàs Areny, Ramon (2018-08-01)
    Article
    Open Access
    Solar energy radiation measurements are essential in precision agriculture and forest monitoring and can be readily performed by attaching commercial pyranometers to autonomous sensor nodes. However this solution significantly ...
  • Time-Division Multiplexing Control of Multi-Input Converters for Low-Power Solar Energy Harvesters 

    López Lapeña, Oscar (Institute of Electrical and Electronics Engineers (IEEE), 2018-03-29)
    Article
    Open Access
    Many autonomous sensor nodes use small photovoltaic (PV) panels oriented towards the direction that provides the highest energy yield in the worst-case scenario. Since all those panels operate at similar irradiance and ...
  • Journal of Electrical Bioimpedance 

    Pallàs Areny, Ramon (University of Oslo, 2018-07-30)
    Article
    Open Access
  • Multisensor system for analyzing the thigh movement during walking 

    Borghetti, Michela; Serpelloni, Mauro; Sardini, Emilio; Casas Piedrafita, Óscar (2017-08-01)
    Article
    Open Access
    Body movements monitoring may allow preventing, diagnosing, and recovering several wrong attitudes that could lead to possible future diseases. A multisensor system was developed to measure thigh movements in free-living ...
  • On the feasibility of noncontact ECG measurements 

    Pallàs Areny, Ramon; Casas Piedrafita, Óscar (2016-03-01)
    Article
    Open Access
    The article by Kranjec et al. [1], “Novel methods of noncontact heart rate measurement: A feasibility study” is interesting and informative as it compares different contactless methods for heart rate detection. Nevertheless, ...
  • The QT scale: a weight scale measuring the QTc interval 

    Couderc, Jean-Philippe; Beshaw, Connor; Xiaodan, Niu; Serrano Finetti, Roberto Ernesto; Casas Piedrafita, Óscar; Pallàs Areny, Ramon; Rosero, Spencer; Zareba, Wojciech (Wiley, 2017-01)
    Article
    Open Access
    Despite the strong evidence of the clinical utility of QTc prolongation as a surrogate marker of cardiac risk, QTc measurement is not part of clinical routine either in hospital or in physician of fi ces. We evaluated ...

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