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Maher Kayal

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Publications associées (165)

Fully integrated ultra-low power management system for micro-power solar energy harvesting applications

Maher Kayal, François Krummenacher, Naser Khosro Pour

A fully integrated, area-efficient and ultra-low power management system for micro-power solar energy harvesting applications is proposed. This system harvests energy from miniaturised solar cells connected in series to charge a rechargeable microbattery. ...

Institution of Engineering and Technology2012

A Hall sensor microsystem with integrated voltage and current references for continuous sensitivity calibration

Maher Kayal, Marc Pastre, Andrea Ajbl

This paper presents a Hall sensor microsystem output and sensitivity calibration targeting low drift (

IEEE2012

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

Experimental Analysis of Lag Sources in Pinned Photodiodes

Maher Kayal, Lysandre-Edouard Bonjour, Nicolas Blanc

A measurement method is reported to distinguish the different mechanisms that lead to image lag in image sensors based on pinned photodiodes (PPDs). This new method can differentiate between the lag caused by a potential barrier or pocket and gate traps in ...

Institute of Electrical and Electronics Engineers2012

Tunable floating active inductor with internal offset reduction

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

Presented is a transistor-level implementation of a floating and tunable CMOS active inductor. It is based on the classical gyrator-C topology and is enhanced by adding an internal offset reduction mechanism to guarantee functionality also for unbalanced D ...

2012

A Miniaturized Autonomous Microsystem for Hydrogen Gas Sensing Applications

Maher Kayal, François Krummenacher, Naser Khosro Pour

This paper presents a fully integrated, ultra-low power microsystem that is used for hydrogen gas sensing in an autonomous wireless sensor node. The proposed circuit harvests solar energy from a micro-power photovoltaic module to measure temperature and hy ...

Ieee2012

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 ...

Ieee2012

Geometrical parameters influence on the Hall effect sensors offset and drift

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

Several Hall sensor configurations have been integrated in CMOS technology and analyzed in terms of offset at room temperature and offset drift. We looked for the best geometry that would minimize the offset and its drift. The targeted specification was 30 ...

IEEE2011

Inversion factor based design methodology using the EKV MOS model

Maher Kayal, Marc Pastre, Andrea Ajbl

This paper presents a hierarchical design methodology based on the inversion factor (IF) as a key design parameter and the equations of the EKV MOS Model. A structured design approach is used to allow high flexibility. The efficiency of the methodology is ...

2011

Reconfigurable fully integrated inductance for high-speed transient stability emulation

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

2011

A fully integrated Hall sensor microsystem with current-mode output

Maher Kayal, Marc Pastre, Andrea Ajbl

This paper presents a fully integrated Hall sensor microsystem with a current-mode output. The system operates in open-loop and includes a Hall sensor with internal biasing, a fully differential front-end, a preamplifier chain and a voltage-to-current conv ...

2011

A mixed-signal platform dedicated to power system dynamic computation

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

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

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

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

Meshing strategy of equivalent substrate schematic in SMART power IC

Maher Kayal, Jean-Michel Sallese, Fabrizio Lo Conte

In this paper, a modeling methodology able to create an equivalent schematic of an High-Voltage integrated circuit is developed. The equivalent schematic is based on enhanced model of diodes and resistances, accounting for minority and majority carrier pro ...

IEEE2011

Towards circuit design using VeSFETs

Maher Kayal, François Krummenacher, Jean-Michel Sallese, Marc Pastre, Lucian Barbut

This paper explores the potential of VeFETs for mixed-signal circuits. A new physics-based compact DC model of the VeSFET operated in subthreshold region is presented and used to derive 1st-order sensitivities of the device threshold voltage to process var ...

2011

Optimization of DC-DC Converters for Improved Electromagnetic Compatibility With High Energy Physics Front-End Electronics

Maher Kayal, Stefano Michelis

The upgrade of the Large Hadron Collider (LHC) experiments at CERN sets new challenges for the powering of the detectors. One of the powering schemes under study is based on DC-DC buck converters mounted on the front-end modules. The hard environmental con ...

Institute of Electrical and Electronics Engineers2011

CAD tools for fast analysis of parasitic coupling and mismatch effects in switched-capacitor circuits

Maher Kayal, François Krummenacher, Sylvain Maréchal

This paper presents a switched-capacitor simulator, optimized for fast computations. Two CAD tools are implemented in order to perform Monte-Carlo simulations, to identify sensitive parasitic coupling prior to layout and to rapidly verify parasitic couplin ...

IEEE2011

A 20-bit dynamic range CMOS A/D converter for ionization chambers

Maher Kayal, François Krummenacher, Bernd Dehning

We present the design of a wide dynamic-range CMOS A/D interface circuit for ionization chambers, able to digitize input charge of both polarities over six decades, to operate in a radioactive environment, and foreseen working without calibration. The circ ...

IEEE2011

Hall effect sensors performance investigation using three-dimensional simulations

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

Several Hall effect sensors were modeled and evaluated regarding the Hall voltage and sensitivity using 3D physical simulations. For accurate results the numerical offset and its temperature drift were analyzed. The versatility of the simulation allows var ...

2011

Optimal filtering of an incremental second-order MASH11 sigma-delta modulator

Maher Kayal, François Krummenacher, Sylvain Maréchal

This paper describes an optimal filter design procedure for a cascaded sigma-delta modulator, starting with a block schematic of a second-order topology and deriving step by step the optimal decoder. The presented filter enhances the resolution of the MASH ...

IEEE2011

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