S. Krishnamoorthy, C. S. Anoop, Boby George
A non-invasive method for detecting the Heart Rate (HR) and the variation in the HR that aids in providing continuous, safe and effective monitoring of drowsiness of an automotive driver or a power tool operator is presented in this paper. HR is detected using an appropriately located photoplethysmograph (PPG) sensor. A simple but reliable detection scheme is developed to accurately measure HR from the PPG signal. The scheme produces a quasi-digital signal, enabling easy interface to a digital system. This signal is independent of base-line and peak-to-peak variations that are present in...
TC4 Symposium 2013
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Konrad Jedrzejewski
The paper presents the toolbox for simulation analysis and support of the high-level design of new adaptive sub-ranging analog-to-digital (A/D) converters whose digital parts allow the iterative calculation of output codes using digital estimation algorithms. The developed appropriate methods and simulation tools enable the assessment of the converters characteristics taking into consideration many different non-idealities (e.g. offsets, noises, non-linearities, gain mismatches) of the internal components of ADCs. The simulation analysis can support the proper choice of the suitable...
TC4 Symposium 2013
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Isil Kalafat Kizilkaya, Mohammed Al-Janabi, Izzet Kale
This paper presents the design, modelling and analysis of novel multi-path time-interleaved analog and digital sigma-delta modulators that can operate at any arbitrary centre-frequency from DC to Nyquist. Dual- and quadruple-path fourth-order Butterworth, Chebyshev, inverse Chebyshev and elliptical based sigma-delta modulators are designed, which offer designers the flexibility of specifying the centre-frequency, pass-band/stop-band attenuation as well as the signal bandwidth. These topologies are compared in terms of their signal-to-noise ratios, hardware complexity, stability, tonality and...
TC4 Symposium 2013
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Larisa Mwalula, Mohammed Al-Janabi, Izzet Kale, Tim Hammersley
This paper investigates the inherent radio frequency analog challenges associated with near field communication systems. Furthermore, the paper presents a digital based sigma-delta modulator for near field communication transmitter implementations. The proposed digital transmitter architecture is designed to best support data intensive applications requiring higher data rates and complex modulation schemes. An NFC transmitter based on a single-bit sigma-delta DAC is introduced, and then the multi-bit extension with necessary simulation results are presented to confirm the suitability of the...
TC4 Symposium 2013
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Antonino Oscar Di Tommaso, Fabio Genduso, Rosario Miceli, Ciro Spataro
Fault-tolerant converters have been widely investigated for years and nowadays an extensive technical literature on this field exists. This paper presents a novel fault detection algorithm based on a simple geometrical approach. In the algorithm analysis both the case of faults in single device and the loss of an entire inverter leg have been considered. The proposed methodology is characterized by simplicity, low computational and implementation effort with a consequent fast execution and easy control integration. The suggested algorithm is verified by means of experimental tests and...
TC4 Symposium 2013
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Tomás García-Sánchez, Maria Guitart, Benjamin Sanchez, Javier Rosell-Ferrer, Anna M. Gomez-Foix, Ramon Bragós
Electroporation or electropermeabilization is a phenomenon observed when lipid bilayers, generally cell membranes, are exposed to high electric field pulses becoming transiently permeable to molecules that under regular conditions are not able to penetrate through them. This change in molecular permeability is believed to be produced by transient aqueous pores created in the lipidic structure and can be monitored by changes in the electrical conductivity of these membranes. The aim of this study is to use fast electrical impedance spectroscopy to measure the process of electroporation...
TC4 Symposium 2013
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Rihab Lahouli, Manel Ben-Romdhane, Chiheb Rebai, Dominique Dallet
This paper presents the study of a novel parallel architecture of analog-to-digital converters (ADCs) based on sigma delta (ΣΔ) modulators using frequency band decomposition (FBD). This architecture is intended for wideband applications with a fractional bandwidth equal to 40% and composed of four channels of 6 th order band-pass discrete time (DT) ΣΔ modulators with single-bit quantization. The simulation results prove that this architecture is able to provide a signal-to-noise ratio (SNR) over 50 dB. These results satisfy the wideband standard requirements. However, parallel architectures...
TC4 Symposium 2013
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Gabriella Crotti, Domenico Giordano
The features of a Power Quality measurement system which includes both voltage and current transducers and a self-developed measuring instrument are described. The system is intended for measurements in substations at medium voltage level. A Rogowski coil and a voltage divider are the used transducers, whereas the measuring system is based on a Reconfigurable I/O-FPGA system with embedded software. Attention is focused on the procedures adopted for the characterisation of the current sensor, which is carried out taking into account the expected on-site measurement conditions, allowing...
TC4 Symposium 2013
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Tamás Virosztek, István Kollár
This paper describes a freely available, open source, user-friendly data evaluation program developed for ADC testing with a sine wave. This tool performs multiple kinds of mathematical methods (nonlinear least squares and maximum likelihood) to extract the information from the recorded data. It has been created in the form of a Matlab toolbox for users who have some knowledge in ADC testing, and would like to perform the mathematical computations in an efficient way – especially those that require complex numerical methods Error! Reference source not found. . As it is equipped with a...
TC4 Symposium 2013
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Josep M. Torrents, Pablo Juan-García, Miguel Á. Sánchez-Moragues
A strategy to design a particular form of magnetic field along an axis from a coaxial inductor is described. The procedure is illustrated with the design of a constant magnetic field inside a cubic inductor. It validates the goodness of the method by comparing the results with all possible combinations of inductance within a limited set of solutions. Magnetic field, magnetic sensor, Helmholtz coils.
TC4 Symposium 2013
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