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Maher Kayal

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Publications associées (162)

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Characterization of a 9-Decade Femtoampere ASIC Front-End for Radiation Monitoring

Maher Kayal, François Krummenacher, Evgenia Voulgari

An ultra-low current sensing digitizer circuit was designed for radiation monitoring for personnel and environmental safety at CERN. The Ultralow Picoammeter 2 (Utopia 2) ASIC includes some key functionalities like on-chip active leakage current compensati ...

2018

A Novel Technique for Online Partial Discharge Pattern Recognition in Large Electrical Motors

Maher Kayal

In this paper, a fully automated system for source detection of the partial discharges (PD) as an online diagnosis test in rotating machineries is proposed. This technique uses a modified version of the Expectation Maximization-based (EM) clustering techni ...

Ieee2014

Republication de : Evaluation of bone-conducted oVEMPs using frontal medial and mastoid stimulations

Maher Kayal

Aims: To determine the optimal stimulation intensity for frontal stimulation with a modified slit lamp holder and to compare the reliability and symmetry of bone-conducted ocular vestibular evoked myogenic potentials (oVEMPs) using two stimulation sites: f ...

2025

Ultra High-Speed Hardware Emulator for Real-Time Fault Location in Multi-Conductor Power Systems

Maher Kayal, François Krummenacher, François Pierre Gaugaz

This research presents a transmission line model aimed for the fault location in power systems using a method based on the Electromagnetic Time-Reversal (EMTR). The discrete-time model simulates the waves travelling in the line by means of many unit delays ...

IEEE2018

Methodology for the Digital Calibration of Analog Circuits and Systems Using Sub-binary Radix DACs

Maher Kayal, Marc Pastre

This paper presents a methodology for digitally calibrating analog circuits and systems. Based on the detection of an imperfection by a simple comparator, a successive approximations algorithm tunes a compensation current. The latter is generated by a sub- ...

2010

Mixed-signal power system emulator extension to solve unbalanced fault transient stability analysis

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

This paper presents the extension of a platform originally devoted to symmetrical transient stability analysis, into the domain of unbalanced faults. The aim of this solver is to increase the speed of dynamic stability assessment for power systems. It is b ...

IEEE2014

Evaluation of characteristic parameters for high performance hall cells

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

The current work focuses on presenting specific Hall cells with high performance, and their corresponding parameters. The design, integration, measurements and model development for their performance assessment are necessary stages considered in the genera ...

Elsevier Sci Ltd2014

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 high sensitivity low-power capacitive front-end for insulin injection pens

Maher Kayal, François Krummenacher, Jean-Baptiste Robert Orhan, François Pierre Gaugaz

A low-power 14-bits first order incremental Analog-to-Digital Converter (ADC) is presented. Based on the charge balancing principle, this switched-capacitor (SC) circuit integrates the input signal multiple times to reach the targeted resolution, linearity ...

ELSEVIER SCI LTD2019

Transient charge pumping as an efficient technique to measure low light intensity with PD SOI MOSFET

Maher Kayal, Jean-Michel Sallese

In this paper, we present a new method to measure light intensity in a floating body partially depleted SOI MOSFET. The photo-generated charge density in the MOSFET is converted into a charge pumping frequency needed to maintain the drain current at a cons ...

2008

Circuit Level Modeling Methodology of Parasitic Substrate Current Injection from a High-Voltage H-bridge at High Temperature

Maher Kayal, Jean-Michel Sallese, Fabrizio Lo Conte

In this paper, a modeling methodology is validated based on an enhanced model of the diode, that we have developed to simulate substrate current coupling mechanisms on a typical H -bridge structure. An equivalent schematic based on an enhanced model of the ...

2011

Distributed real-time dynamic security assessment using intelligent techniques

Maher Kayal, Sidi-Rachid Cherkaoui, Theodoros Kyriakidis

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

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

Maher Kayal, Sidi-Rachid Cherkaoui, 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

A mixed-signal platform dedicated to power system dynamic computation

Maher Kayal, Sidi-Rachid Cherkaoui, Laurent Fabre, Ira Nagel, Cédric Meinen

has already been proven that analog emulation overcomes the speed limits of numerical simulators by means of a simple fixed-topology prototype. In order to enhance the modularity and the size of the emulated power system a dedicated platform based on a fie ...

IEEE2011

A Hall sensor microsystem with continuous gain calibration using fully integrated references

Maher Kayal, Marc Pastre, Andrea Ajbl

This paper presents an integrated Hall sensor microsystem with continuous gain calibration and a current-mode back-end. The integrated system includes a Hall sensor with internal biasing, a fully differential front-end, a preamplifier chain, a voltage-to-c ...

IEEE2012

Towards the next generation of intelligent building: An assessment study of current automation and future IoT based systems with a proposal for transitional design

Maher Kayal, Georgios Lilis, Gilbert Didier Francis Conus, Nastaran Asadi Zanjani

The intelligent building, a major smart city research and development domain, has grown beyond the scope of automation, currently focusing on the occupant centered approaches and the ancillary services offered to the power grid. The Internet of Things (IoT ...

Elsevier Science Bv2017

High-Speed Power System Stability Simulation Using Analog Computation

Maher Kayal, Sidi-Rachid Cherkaoui, Laurent Fabre, Ira Nagel

This paper presents a microelectronic emulation approach for high-speed power system computation. First, the problems of existing power system simulators are detailed. This shows that microelectronic emulation is a possible solution for solving the speed p ...

2010

An ultra high-speed, mixed-signal emulator for solving power system dynamic equations

Maher Kayal, Sidi-Rachid Cherkaoui, Laurent Fabre, Ira Nagel, Fabrizio Lo Conte, Guillaume Olivier Lanz

This paper focuses on a new pipelined processing unit architecture dedicated to mixed-signal power system emulation. Prior research in this field has proven that analog emulation overcomes the speed limits of numerical simulators with reliable accuracy. Th ...

IEEE2011

FD SOI Hall sensor electronics interfaces for energy measurement

Maher Kayal

This paper presents a SOI Hall sensor based microsystem for energy measurement. The mixed-mode signal circuitry has been entirely designed and integrated in the experimental 0.5 mu m fully depleted SOI 3 V technology. It consists of an integrated Hall elem ...

2006

RF power amplifier employing a frequency-tunable impedance matching network based on coupled inductors

Maher Kayal

Coupled inductors can be used as tunable inductances. Employing coupled inductors in the output impedance matching network of an RF power amplifier leads to superior performance when operating in more than one frequency band. As proof of this concept, the ...

2008