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Maher Kayal

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Publications associées (165)

Component design and testing for a miniaturised autonomous sensor based on a nanowire materials platform

Maher Kayal, François Krummenacher, Mihai Adrian Ionescu, Montserrat Fernandez-Bolanos Badia, Naser Khosro Pour, Elizabeth Buitrago Godinez

We present the design considerations of an autonomous wireless sensor and discuss the fabrication and testing of the various components including the energy harvester, the active sensing devices and the power management and sensor interface circuits. A com ...

Springer2014

A DC power flow extension

Sidi-Rachid Cherkaoui, Maher Kayal, Theodoros Kyriakidis

In this work an extension of the well-known DC power flow method is presented. A normal DC power flow of the system is executed to determine voltage angles and a novel derivation of voltage amplitudes is devised. The latter is rigorously formulated and eig ...

IEEE2013

High-Speed Power System Transient Stability Simulation Using Highly Dedicated Hardware

Sidi-Rachid Cherkaoui, Maher Kayal, François Krummenacher, Marc Pastre, Laurent Fabre, Ira Nagel

This paper presents a fully analog demonstrator based on power system emulation for high-speed power system stability analysis.Abenchmark using a fixed two-machine topology has been implemented. The characteristics of the emulated components (i.e., generat ...

IEEE Institute of Electrical and Electronics Engineers2013

Distributed real-time dynamic security assessment using intelligent techniques

Sidi-Rachid Cherkaoui, Maher Kayal, Theodoros Kyriakidis, Karthik Kumar

In real time scenario, transmission (of power) in power systems may not be always ideal i.e. they may be interrupted. As a result, the synchronization among the power generating modules may be lost. Loss of synchronization has a direct effect on the stabil ...

IEEE2013

A Fully Integrated Hall Sensor Microsystem for Contactless Current Measurement

Maher Kayal, Marc Pastre, Andrea Ajbl

Contactless current measurement based on Hall-effect sensors can be performed in either closed-or open-loop configuration. In this paper an open-loop sensor system with a current-mode output is described. The system measures the magnetic field induced arou ...

Institute of Electrical and Electronics Engineers2013

A 120 dB dynamic-range radiation-tolerant charge-to-digital converter for radiation monitoring

Maher Kayal, François Krummenacher, Bernd Dehning

We present a radiation-tolerant 120 dB dynamic-range interface circuit for ionization chambers and diamond detectors. The device consists of a multi-scale continuous-time incremental charge-to-digital converter paired with a temperature-compensated current ...

Elsevier2013

On-chip Mass Sensing at the Physical Limits of Nanoelectromechanical Systems

Maher Kayal, Marc Pastre, Christian Kauth

A tunable and self-regulating on-chip carbon nanotube based mass balance is presented for small-size and low-cost environmental and healthcare applications. Tube stretching and a phase-locked loop topology make the system widely universal and invariant to ...

Ieee2013

An Ultra-High Speed Emulator Dedicated to Power System Dynamics Computation Based on a Mixed-Signal Hardware Platform

Sidi-Rachid Cherkaoui, Maher Kayal, Laurent Fabre, Ira Nagel, Guillaume Olivier Lanz, Denis Sallin, Theodoros Kyriakidis

This paper presents an ultra-high speed hardware platform dedicated to power system dynamic (small signal) and transient (large signal) stability. It is based on an intrinsic parallel architecture which contains hybrid mixed-signal (analog and digital) cir ...

IEEE Institute of Electrical and Electronics Engineers2013

CMOS Demodulation Image Sensor for Nanosecond Optical Waveform Analysis

Maher Kayal, Lysandre-Edouard Bonjour, Nicolas Blanc

An image sensor with 256 x 256 pixels and a pitch of 6.3 mu m, suitable for resolving ultrashort optical phenomena, is developed. It is based on a standard CMOS process with pinned photodiode option. The pixel comprises three transfer gates to allow versat ...

Institute of Electrical and Electronics Engineers2013

Temperature considerations on Hall Effect sensors current-related sensitivity behaviour

Maher Kayal, Jean-Michel Sallese, Maria-Alexandra Paun

The present paper focuses on evaluating the temperature effects on Hall Effect sensors sensitivity behavior. To this purpose, an analysis of the factors affecting the sensors current-related sensitivity is performed, consisting of several pertinent conside ...

Springer US2013

An ultra-low power energy-efficient microsystem for hydrogen gas sensing applications

Maher Kayal, François Krummenacher, Naser Khosro Pour

This paper presents a fully integrated power management and sensing microsystem that harvests solar energy from a micro-power photovoltaic module for autonomous operation of a miniaturized hydrogen sensor. In order to measure H-2 concentration, conductance ...

Springer US2013

System-Level Design Considerations for Carbon Nanotube Electromechanical Resonators

Maher Kayal, Jean-Michel Sallese, Marc Pastre, Christian Kauth

Despite an evermore complete plethora of complex domain-specific semiempirical models, no succinct recipe for large-scale carbon nanotube electromechanical systems design has been formulated. To combine the benefits of these highly sensitive miniaturized m ...

Hindawi Publishing Corporation2013

A miniaturised autonomous sensor based on nanowire materials platform: the SiNAPS mote

Maher Kayal, Naser Khosro Pour

A micro-power energy harvesting system based on core(crystalline Si)-shell(amorphous Si) nanowire solar cells together with a nanowire-modified CMOS sensing platform have been developed to be used in a dust-sized autonomous chemical sensor node. The mote ( ...

Spie-Int Soc Optical Engineering2013

A Circuit Model for CMOS Hall Cells Performance Evaluation including Temperature Effects

Maher Kayal, Jean-Michel Sallese, Maria-Alexandra Paun

In order to provide the information on their Hall voltage, sensitivity, and drift with temperature, a new simpler lumped circuit model for the evaluation of various Hall cells has been developed. In this sense, the finite element model proposed by the auth ...

Hindawi Publishing Corporation2013

A 3D architecture platform dedicated to high-speed computation for power system

Sidi-Rachid Cherkaoui, Maher Kayal, Laurent Fabre, Ira Nagel, Guillaume Olivier Lanz, Denis Sallin, Theodoros Kyriakidis

This paper presents an innovative 3D hardware architecture for power system dynamic and transient stability. Based on an intrinsic parallel architecture by means of mixedsignal circuits (analog and digital) it overcomes the speed of numerical simulators fo ...

2013

Comparative Study on the Performance of Five Different Hall Effect Devices

Maher Kayal, Jean-Michel Sallese, Maria-Alexandra Paun

Five different Hall Effect sensors were modeled and their performance evaluated using a three dimensional simulator. The physical structure of the implemented sensors reproduces a certain technological fabrication process. Hall voltage, absolute, current-r ...

Mdpi Ag2013

A Transient Stability Assessment Method using Post-Fault Trajectories

Sidi-Rachid Cherkaoui, Maher Kayal, Guillaume Olivier Lanz, Theodoros Kyriakidis

Transient Stability Assessment (TSA) is the process in which the stability of a system is characterized qualitatively or quantitatively. The TSA algorithm presented in this paper is derived from the well-established Single Machine Equivalent (SIME) method ...

2013

A Self-Regulating Oscillator for Sensor Operation of Nanoelectromechanical Systems

Maher Kayal, Marc Pastre, Christian Kauth

A closed-loop oscillator topology is proposed for dynamic sensor operation of nanoelectromechanical systems, benefiting from the structure's quality factor. Automatic adaptation to diverse sensors' properties is achieved via a self-regulating phase-locked ...

Ieee2013

Offset And Drift Analysis Of The Hall Effect Sensors. The Geometrical Parameters Influence

Maher Kayal, Jean-Michel Sallese, Maria-Alexandra Paun

Several Hall sensor configurations have been integrated in CMOS 0.35 mu m technology and analyzed in terms of offset at room temperature and offset drift. We searched for the best geometry that would minimize the offset and its corresponding drift. The tar ...

Inst Materials Physics2012

Temperature Influence Investigation on Hall Effect Sensors Performance Using a Lumped Circuit Model

Maher Kayal, Jean-Michel Sallese, Maria-Alexandra Paun

In order to provide the information on their Hall voltage, sensitivity and drift with temperature, a new simpler lumped circuit model for the evaluation of various Hall Effect sensors has been developed. In this sense, the finite element model associated c ...

IEEE2012

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