YÚFERA GARCÍA , Alberto

En este trabajo de Tesis se demuestra la realización de FDO mediante técnicas de corrientes conmutadas, SI, en el marco de tecnologías VLSI CMOS digitales. La organización y contenido de esta memoria se puede resumir de la siguiente forma.En el Capítulo 2 se hace una breve revisión sobre los conceptos fundamentales de la teoría de FDO,...

This paper presents a computer tool for automatic analysis of cell culture images. The program allows the extraction of relevant information from biological images for pre and post system analysis. In particular, this tool is being used for electrical characterization of electrode-solution-cell systems in which bio-impedance is the main...

Se presenta un paquete de software didáctico que facilita el proceso de enseñanza/aprendizaje de la electrónica, orientado a un sistema de adquisición de datos elemental. Consta de una breve sección expositiva, en la que se describen los contenidos de la materia, más un conjunto de simulaciones que permiten al alumno conocer el funcionamiento...

This paper presents a computer tool for automatic analysis of cell culture images. The program allows the extraction of relevant information from biological images for pre and post system analysis. In particular, this tool is being used for electrical characterization of electrode-solution-cell systems in which bio-impedance is the main...

Se presenta un entorno de programación para el estudio y desarrollo de algoritmos de tratamiento de imágenes y visión por computador. La herramienta permite la programación en cualquier lenguaje, con la única restricción de que se desarrolle bajo entornos windows. Se ha concebido como instrumento de ayuda a la realización de prácticas de...

Se presenta un entorno de programación para el estudio y desarrollo de algoritmos de tratamiento de imágenes y visión por computador. La herramienta permite la programación en cualquier lenguaje, con la única restricción de que se desarrolle bajo entornos windows. Se ha concebido como instrumento de ayuda a la realización de prácticas de...

Se presenta un paquete de software didáctico que facilita el proceso de enseñanza/ aprendizaje de la electrónica, en concreto, de convertidores digital-analógicos. Consta de una sección expositiva, en la que se describen los contenidos de la materia, más un conjunto de simulaciones que permiten al alumno conocer el funcionamiento interno del...

This paper proposes a method for impedance measurements based on a closed-loop implementation of CMOS circuits. The proposed system has been conceived for alternate current excited systems, performing simultaneously driving and measuring functions, thanks to feedback. The system delivers magnitude and phase signals independently, which can be...

The implementation of a continuous-time filter (CTF) useful for audio frequency applications is presented in this paper. The filter functions can be programmed and tuned with two independent control variables. The filter here proposed has been designed to work at 1.5 V of power supply and at a maximum of 0.5 /spl mu/A/OTA for the worst case...

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This paper proposes a new method for bio-impedance measurement useful to 2D processing of cell cultures. It allows to represent biological samples by using a new impedance sensing method, and exploiting the electrode-to-cell model for both electrical simulation and imaging reconstruction. Preliminary electrical simulations are reported to...

A sinusoidal voltage wave generator is proposed based on the use of micro- processor digital signals with programmable duty-cycles, with application to real-time Electrical Cell-substrate Impedance Spectroscopy (ECIS) assays in cell cultures. The working principle relies on the time convolution of the programmed microcontroller (μC) digital...

This paper reports two general methods for extraction of cell-electrode electrical model parameters in cell culture (CC) assays. The presented approaches can be applied to CC assays based on electrical cell-substrate impedance spectroscopy (ECIS) technique for real-time supervision, providing the cell number per square centimeter, i.e., the...

This paper presents a capacitive system capable of performing leg volume change monitorization in patients suffering from Heart Failure (HF) conditions. The body volume evolution serves as a prognosis marker for this kind of patients, such patients can benefit from a wearable monitorization system. The proposal is based on a contactless...

This paper proposes a cell-microelectrode model for cell biometry applications, based on the area overlap as main parameter. The model can be applied to cell size identification, cell count, and their extension to cell growth and dosimetry protocols. Experiments performed with comercial electrodes are presented, illustrating a procedure to...

The influence of the main source of errors in Switched-Current (SI) filters over the performance of Wave Analog Filters (WAE) is evaluated. Models of mismatching and clock-feedthrough (CF) are deduced for basic building blocks, and applied to study the sensitivity of a third-order filter. Monte Carlo simulations performed using a behavior...

In this paper the application of a cellmicroelectrode model to cell biometry experiments is proposed, using the cell-electrode area overlap as main parameter. The model can be applied to cell size identification, cell count, and their extension to cell growth and dosimetry protocols. Experimental results using AA8 cell line are presented,...

In this paper, an incremental Analog-to- Digital Converter (ADC) designed as part of the signalconditioning circuitry for tissue impedance measurement system is presented. Continuous-time design techniques has been used and a modified implementation of the conversion algorithm, with respect to its discrete-time counterpart, has been developed....

This paper describes a novel cell used in circuits with Floating Gate MOS transistors (FGMOS) to compensate variations in the device effective threshold voltages caused by the trapped charge at the floating gate. The performance of the circuit is illustrated with experimental results showing a residual error below 1%. This coarse compensation...

The development of new sensing technologies, biomaterials, microelectronic devices, microfluidic systems and micro-electro-mechanical systems (MEMs) etc., opens the window to new biomedical circuits and system opportunities to measure "better", and to develop "alternative" methods to find relevant information for physician and biologist teams,...

In this paper, a CMOS implementation of a low voltage micropower logarithmic biquad based on floating gate MOS transistors (FGMOS) is presented. The translinear principle applied to the floating gate MOS transistor leads to an easy implementation of the state-space equations without using the source terminal in the loop. The voltage supply can...

In this paper, the design and simulation results of an IV integrator using floating gate MOS (FGMOS) transistor techniques is presented. Combining FGMOS working in strong and in weak inversion a current-mode companding integrator is proposed implemented in a standard CMOS process is able to work with very low supply voltage. It has application...