Now showing items 1-3 of 3

  • An improved buffer for bioelectric signals 

    Pallàs Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-04-01)
    Article
    Open Access
    We propose an AC-coupled amplifier that offers a high in-put impedance, thus making it suitable for bioelectric signal amplifi- cation. We also present the necessary formulas for calculating its input impedance and transfer ...
  • Skin impedance from 1 Hz to 1 MHz 

    Rosell Ferrer, Francisco Javier; Colominas i Balagué, Josep; Riu Costa, Pere Joan; Pallàs Areny, Ramon; Webster, John G. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1988-08-01)
    Article
    Open Access
    We measured the impedance of skin coated with gel, but otherwise unprepared from 1 Hz to 1 MHz at ten sites on the thorax, leg, and forehead of ten subjects. For a 1 cm2 area, the 1 Hz impedance varied from 10 kΩ to 1 MΩ, ...
  • The effect of respiration-induced heart movements on the ECG 

    Pallàs Areny, Ramon; Colominas i Balagué, Josep; Rosell Ferrer, Francisco Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1989-06-01)
    Article
    Open Access
    We present a model describing the rotation of the cardiac vector as a possible mechanism resulting in the presence of respiratory information in the ECG. The way in which this information is revealed is analyzed and the ...