Browsing by Author "Pallàs Areny, Ramon"
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AC-coupled front-end for biopotential measurements
Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2003-03)
Article
Open AccessAC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of ... -
A comprehensive model for power line interference in biopotential measurements
Fernández Chimeno, Mireya; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2000-06-30)
Article
Open AccessPower line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are ... -
A fast method to estimate body capacitance to ground
Aliau Bonet, Carles; Pallàs Areny, Ramon (2012)
Conference report
Open Access -
A fast method to estimate body capacitance to ground at mid frequencies
Aliau Bonet, Carles; Pallàs Areny, Ramon (University of Oslo, 2015-12-18)
Article
Open AccessImpedance measurements that involve the human body are affected by the capacitance between the body and earth ground. This paper describes a fast method to estimate that apacitance at 10 kHz, which is valid for impedance ... -
A hands-on approach to differential circuit measurements
Pallàs Areny, Ramon; Casas Piedrafita, Óscar (Elsevier, 2007-01)
Article
Open AccessElectronic engineering is showing a definite trend towards differential circuits. However, most measurement instruments are single-ended. Consequently, engineering graduates often lack the skills to perform correct ... -
An algorithm for beat-to-beat heart rate detection from the BCG based on the continuous spline wavelet transform
Alvarado Serrano, Carlos; Luna Lozano, Pablo Samuel; Pallàs Areny, Ramon (2016-05-01)
Article
Restricted access - publisher's policyThis work describes an algorithm intended to detect the beat-to-beat heart rate from the ballistocardiogram (BCG) obtained from seated subjects. The algorithm is based on the continuous wavelet transform with splines, which ... -
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 AccessWe 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 ... -
A novel algorithm for fast BCG cycle extraction in ambulatory scenarios
Gomez Clapers, Joan; Casanella Alonso, Ramón; Pallàs Areny, Ramon (2016)
Conference lecture
Restricted access - publisher's policyA novel algorithm JDet for ballistocardiogram (BCG) cycle extraction is presented that is intended for the fast generation of ensemble averages in ambulatory scenarios where the ECG signal is not available. First, the ... -
A novel fully differential biopotential amplifier with DC suppression
Spinelli, Enrique M.; Martínez, Nolberto; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2004-08)
Article
Open AccessFully differential amplifiers yield large differential gains and also high common mode rejection ratio (CMRR), provided they do not include any unmatched grounded component. In biopotential measurements, however, the ... -
A novel method to obtain proximal plethysmographic information from distal measurements using the impedance plethysmogram
Gómez Clapers, Joan; Casanella Alonso, Ramón; Pallàs Areny, Ramon (University of Oslo, 2015-12-23)
Article
Open AccessWe present a novel method to detect proximal volume changes based on the impedance plethysmogram (IPG) measured from limb to limb with two electrode pairs symmetrically placed at distal areas of the upper or the lower ... -
A novel robust index to assess beat-to-beat variability in heart rate time-series analysis
García González, Miguel Ángel; Pallàs Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-06-30)
Article
Open AccessA new index is proposed to estimate the variance of the differentiated heart rate (RR) time series from its truncated histogram. The index is more robust to artifacts than the standard deviation of the differentiated RR ... -
A novel sensor-bridge-to-microcontroller interface
Custodio Ruiz, Ángel; Bragós Bardia, Ramon; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2001-05)
Conference report
Open AccessSensor bridges are usually interfaced to microcontrollers by supplying the bridge with a voltage or current and digitizing the resulting voltage or current after being amplified and low-pass filtered. This paper proposes ... -
A practical approach to electrode-skin impedance unbalance measurement
Spinelli, Enrique M.; Mayosky, Miguel Ángel; Pallàs Areny, Ramon (Institute of Electrical and Electronics Engineers, 2006-07)
Article
Open AccessUnbalance between electrode-skin impedances is a major problem in biopotential recordings, leading to increased power-line interference. This paper proposes a simple, direct method to measure that unbalance at power-line ... -
Automatic Concealed Heart Rate Detection from the BCG in Seated Position
Luna Lozano, P. S.; Pallàs Areny, Ramon (2015-03-01)
Article
Open AccessContinuous monitoring of health state is important in elder and chronically ill (but otherwise not critical) patients. Ideally, the patient should not be aware of being continuously monitored. This study describes an ... -
Automatic detection of ECG ventricular activity waves using continuous spline wavelet transform
Alvarado Serrano, Carlos; Arregui, J.; Ramos Castro, Juan José; Pallàs Areny, Ramon (2005)
Conference report
Open AccessIn this study, we present detection algorithms of characteristic points of the QRS and T waves based on the continuous wavelet transform (CWT) with splines. This technique can handle any integer scale and the analysis is ... -
La Bioingeniería en la Escuela
Pallàs Areny, Ramon (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1993)
Article
Open Access -
Charge-transfer-based signal interface for differential capacitive sensors
Gaitán Pitre, Jorge Elicer; Pallàs Areny, Ramon (2015)
Conference lecture
Open AccessWe propose a circuit to directly connect a differential capacitive sensor to a microcontroller unit (MCU), which is based on the charge-transfer method and does not need any calibration component. The performance has been ... -
Charge-transfer-based signal interface for resistive sensors
Gaitán Pitre, Jorge Elicer; Pallàs Areny, Ramon (2015)
Conference lecture
Open AccessCharge transfer has been demonstrated to be a cost-effective method to measure capacitive sensors with low-end microcontrollers. Here we apply charge transfer to measure the output of voltage dividers that include a high ... -
Comments on "On resistor-induced thermal noise in linear circuits"
Vargas Drechsler, Manuel; Pallàs Areny, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-04-30)
Working paper
Open AccessCorrespondència referida a l'article de R. Giannetti, publicat ibid. vol.49 p.87-88 -
La Compatibilidad electromagnética, un problema en la sociedad actual
Pallàs Areny, Ramon; Silva, Ferran (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1999)
Article
Open Access