Browsing by Author "Gardella, Pablo"
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ponencia en congreso.listelement.badge Acoustical renovation of “Nuestra Señora de la Paz”(2016-09) Del Solar Dorrego, Fernando; Gardella, Pablo"Church “Nuestra Señora de la Paz” is located in Pilar, province of Buenos Aires, Argentina. It has an octagonal floor plan and an internal volume of 2500 m3 with bare sidewalls and little ornamentation. Excessive reverberation (4 seconds at mid-band frequencies), and an inappropriate sound system impaired speech intelligibility making ceremonies almost unintelligible. The church also suffered from thermal problems due to insufficient thermal insulation on the roof. Measurements (reverberation time, impulse responses and STI) were carried out and subsequent analysis revealed the significance of these problems. A holistic acoustical and thermal renovation was proposed and a new sound system was designed to address these issues. Subsequent measurements validated the effectiveness of the proposed renovations."artículo de publicación periódica.listelement.badge Analysis of the Impact of the monitoring equipment on the common-mode to differential-mode conversion in bulk current injection tests(2021) Gardella, Pablo; Marini, Eduardo"In this paper, the common-mode to differential mode conversion in a Bulk Current Injection (BCI) test setup is analyzed in the presence of an optical fiber transmitter. A modular-basis analysis based on S-parameters measurements and Electromagnetic simulations has been performed. It is shown that the loading effects can change the insertion losses from the RF amplifier to the Devices Under Test, even at frequencies as low as 10MHz by 2dB and up to 23dB at worst cases. The study has been undertaken with the substitution and closed-loop methods. Quantification of this problem as well as mitigation strategies are proposed, analyzed and evaluated with the aim of improving the accuracy of BCI simulations at early-design stages. Considering the significant cost of redesigning at an advanced point in the product development cycle, the presented work expects to raise awareness about how even small changes in the BCI setup can remarkably compromise the outcome."ponencia en congreso.listelement.badge A chopped front-end system with common-mode feedback for real time ECG applications(2017) Gardella, Pablo; Villa Fernández, Emanuel; Baez, Eduardo; Cesaretti, Juan Manuel"A Front-End system composed of an instrumentation amplifier with common-mode feedback and a second-order sigma-delta analog to digital converter is proposed. Chopping techniques are used to remove offset and low frequency noise to guarantee a noise floor below the signal of interest. Measurements show that common-mode feedback adds 71 dB to the CMRR at 50 Hz and the input referred noise is 1.17 μVRMS over the frequency range of 0.1 Hz to 400 Hz."póster.listelement.badge Desarrollo de un circuito integrado para mediciones de electrocardiografía (ECG)(2016) Villa Fernández, Emanuel; Gardella, Pablo; Angélico Engelhardt, Mathias; Baez, Eduardo; Cesaretti, Juan Manuel"Diseño y fabricación de un sistema electrocardiógrafo en un proceso de 0,5 μm. El sistema está compuesto por un amplificador instrumental choppeado y con una realimentación del modo común a través del sujeto bajo medición, un ADC Σ∆ de segundo orden, etapas de procesamiento digital y una interfaz de comunicación."ponencia en congreso.listelement.badge Design of ESD protections for ECG applications(2020-02) Gardella, Pablo; Baez, Eduardo; Cesaretti, Juan Manuel"This paper presents the design of Electrostatic Discharge (ESD) protections for a remote Electroencephalograph (ECG). Design and layout guidelines are analyzed to improve the ESD robustness of a Grounded-Gate NMOS (GGNMOS) cell based on a single well CMOS-only process. Experimental validation is done by means of a Time Domain Reflectometry (TDR) technique known as Transmission Line Pulse (TLP) testing. The silicon implementation of the proposed design passes ±3700V in the Human-Body Model (HBM)."ponencia en congreso.listelement.badge Low noise front-end and ADC for real-time ECG System in CMOS process(2019-03-14) Gardella, Pablo; Villa Fernández, Emanuel; Baez, Eduardo; Biberidis, Nicolás; Cesaretti, Juan Manuel"This paper presents the design and experimental results of a digital acquisition system based on a chopper-stabilized Instrumentation Amplifier with Common-Mode feedback for CMRR enhancement. Chopping techniques are used to remove both offset and flicker noise, detrimental effects characteristic of pure CMOS processes. A second-order, discrete-time, single-bit Sigma-Delta ADC with CIFB structure is used to convert the signal into the digital domain where it can be processed in real time to diagnose and report urgencies. Measurements on a 0.6μm process have shown that the input CMRR is boosted by 71dB when the feedback is closed through the patient. The input referred integrated noise for the overall system within the ECG band frequencies of 0.1Hz to 400Hz (including the quantization noise) is 4.2μVP, below the recommended maximum detection error of 10.0μVP."póster.listelement.badge Microelectrónica aplicada a Real-Time ECG(2018) Villa Fernández, Emanuel; Gardella, Pablo; Biberidis, Nicolás; Baez, Eduardo; Cesaretti, Juan Manuel"El proyecto es un sistema microelectrónico de ECG en tiempo real y bajo costo implementado en un circuito integrado diseñado completamente en la universidad. Además de medir la actividad del corazón, con este sistema se puede determinar la presencia de arritmias u otras enfermedades cardíacas."proyecto final de grado.listelement.badge Pedal wah wah inalámbrico(2016) Bersier, Andrés; Rizzo, Gonzalo; Gardella, Pablo; Padín, Mauro"El objetivo principal como proyecto es lograr el desarrollo de un pedal wah wah inalámbrico de bajo costo y consumo que pueda ser construido sin necesidad de importaciones irreemplazables en el mercado local. El motivo de esto último se debe al contexto político que envuelve al país donde la disponibilidad de componentes está constantemente condicionada por la burocracia aduanera y el gobierno nacional de turno."ponencia en congreso.listelement.badge Power supply rejection and sensitivity analyses of a peak current source with emitter degeneration(2022) Ledesma, Francisco Daniel; Dutriez Diaz, Philippe; Scapolla, Franco; Lin, Xi; Gardella, Pablo"Technology developments are demanding increasingly stringent requirements in terms of Electromagnetic Com patibility (EMC). For IC designers, this implies increasing Power Supply Rejection (PSR) while at the same time reducing the Icc spectrum. This work provides a theoretical analysis of the Peak Current Source with emitter degeneration (PCS-ED), a well known current mirror to achieve high PSR, which gets improved even further by the emitter resistance. The trade-off between the output current and the PSR were analyzed, as well as a sensitivity analysis to quantify the effects of the emitter degeneration. Experimental measurements have been performed to validate the immunity of an off-the-shelf bipolar transistor array from 100kHz up to 1GHz. Results showed that despite the small-signal analyses predicted a considerable improvement, the non-linear effects introduced by the input stage remained as the limiting factor in terms of PSR, leading to similar responses in the Peak Current Source (PCS) and the PCS-ED, despite one having much larger PSR than the other."póster.listelement.badge Sound field(2017) Ressl, Marc S.; Bersier, Andrés; Gardella, Pablo; Padín, Mauro; Rizzo, Gonzalo"Sound Field es una obra de arte de realidad virtual concebida a partir de un sistema de sonido posicional diseñado y desarrollado por alumnos del Instituto Tecnológico de Buenos Aires."ponencia en congreso.listelement.badge Trajectory sequential patterns with regular expression constraints including spatial queries(2010-05) Gardella, Pablo; Gómez, Leticia Irene; Vaisman, Alejandro Ariel"Moving object (MO) data representation and computing have received a fair share of attention over recent years from the database community. Replacing raw trajectory data (i.e., MO positions at different time instants) by sequences of application-dependent stops occurred at so-called places of interest (Pols) leads to the notion of semantic trajectories. Different techniques exist for sequential pattern analysis of trajectories defined in this way. One of them, RE-SPaM, expresses sequential patterns by means of regular expressions built not only over item identifiers, but also over constraints defined on the (temporal and non-temporal) attributes of the items to be analyzed. This analysis could be greatly enriched if spatial and non-spatial data associated with the MO are taken into account. In this paper we show how we can take advantage of the extensibility properties of RE-SPaM to augment its expressive power by allowing to include spatial queries in the constraints. For this, we make use of Piet, a framework allowing to integrate OLAP, GIS and MO data, and its associated query language denoted Piet-QL, providing a link between moving object data and their geographic environment."