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Maher Kayal

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Publications associées (165)

9 MHz vibrating body FET tuning fork oscillator

Maher Kayal, Mihai Adrian Ionescu, Daniel Grogg, Fabrizio Lo Conte

A 9.4MHz micro-electromechanical oscillator based on a Vibrating Body Field Effect Transistor (VB-FET) is presented in this work. The tuning fork VB-FET used in this work provides a high quality factor of 9400 in the open-loop configuration and a low equiv ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Global 2D modeling of minority and majority substrate coupled currents

Maher Kayal, François Krummenacher, Jean-Michel Sallese, Marc Pastre, Fabrizio Lo Conte

This paper presents a modeling strategy to simulate 2D propagation of electrical perturbations induced by direct biasing of substrate junctions. Identifying parasitic substrate devices such as bipolar transistors reaches rapidly its limit when multiple cur ...

2009

Optimization of shielded PCB air-core toroids for high efficiency dc-dc converters

Maher Kayal, Stefano Michelis

The paper describes the design of optimized PCB air-core toroids for high frequency DC-DC converters with strict requirements in terms of volume and noise. The effect of several design parameters on the overall inductor volume, on DC and AC winding resista ...

2009

A fully integrated solar battery charger

Maher Kayal, François Krummenacher, Marc Pastre

This paper presents a solar charger ASIC for Nickelbased (NiCd or NiMH) batteries. The system is fully integrated and no external component is needed. The ASIC includes a voltage reference, a low-impedance switch, an oscillator, a poweron reset, and a digi ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Capacitor-less memory and abrupt switch based on hysteresis characteristics in punch-through impact ionization mos transistor (PI-MOS)

Maher Kayal, Vincent Pott, Mihai Adrian Ionescu, Kirsten Emilie Moselund

The present invention exploits the impact ionization induced by drain voltage increase and the onset of a bipolar parasitic in an Omega-gate field effect metal oxide insulator transistor (called PI-MOS), in order to obtain a memory effect and abrupt curren ...

2009

Experimental Investigation of Flow Instabilities and Rotating Stall in a High-Energy Centrifugal Pump Stage

François Avellan, Philippe Dupont, Maher Kayal, Mohamed Farhat, Laurent Fabre, Stefan Berten

In centrifugal pumps, the interaction between the rotating impeller and the stationary diffuser generates specific pressure fluctuation patterns. When the pump is operated at off design conditions, these pressure fluctuations increase. The resulting rise o ...

ASME2009

High-quality factor MEMS based oscillator: Silicon 9 MHz oscillator with low phase noise and high quality factor

Maher Kayal, Mihai Adrian Ionescu, Daniel Grogg, Fabrizio Lo Conte

In this paper, an oscillator based on a Vibrating Body Field Effect Transistor (VB-FET) working at 9.4MHz is presented. The electrical characteristics of this active MEM resonator are detailed for static and dynamic operation. The benefit of the intrinsic ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

A prototype ASIC buck converter for LHC upgrades

Maher Kayal, Stefano Michelis

2008

Microelectronic Emulation for Power System Computation

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

2008

DRAM Based on Hysteresis in Impact Ionization Single-Transistor-Latch

Didier Bouvet, Maher Kayal, Vincent Pott, Mihai Adrian Ionescu, Cédric Meinen, Kirsten Emilie Moselund

This work reports on memory applications of punch-through impact ionization single-transistor latch (PIMOS), showing abrupt current switching (3-10mV/dec.) as well as hysteresis in both ID(VDS) and ID(VGS). A capacitor-less 1PIMOS - 1 MOSFET DRAM memory is ...

2008

Optical sensor using a floating body SOI MOSFET in the Delta-sigma loop

Maher Kayal, Jean-Michel Sallese, Louis Harik

In this paper, the partially depleted SOI phototransistor has been used as a light intensity sensor. A pixel implementing the technique elaborated in [1] was designed and implemented on SOI technology. The circuit implements a first order Delta-sigma modul ...

2008

Feedback loop conception methodology for step-down continuous switching DC/DC converter

Maher Kayal, Stefano Michelis

The stability and the dimensioning of a step-down switching voltage regulator feedback loop remain a complex task. An analytical approach allows dimensioning of all the components, strongly facilitating this task. In this article, a mathematical analysis i ...

2008

Reducing the number of comparators in multi-bit ΔΣ modulators

Maher Kayal

Multi-bit feedback, being one way of lowering ΔΣ modulators power consumption, has a major obstacle: the number of components in the internal analog-to-digital converter (ADC) and digital-to-analog converter (DAC). Nevertheless, the number of comparators i ...

2008

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

Maher Kayal, Jean-Michel Sallese, Louis Harik

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

Delta-sigma loop based on charge pumping in SOI optical sensor

Maher Kayal, Jean-Michel Sallese, Louis Harik

2008

Transient charge pumping as a new technique for a higher sensitivity SOI MOSFET photodetector

Maher Kayal, Jean-Michel Sallese, Louis Harik

In this paper, we have used the partially depleted SOI MOSFET to measure the intensity of light. The charge pumping technique was used to get rid of the photogenerated carriers in the body in an attempt to keep the drain current constant. Using this techni ...

2008

Double gate movable body Micro-Electro-Mechanical FET as hysteretic switch: Application to data transmission systems

Maher Kayal, Mihai Adrian Ionescu, Cédric Meinen, Daniel Grogg, Hüseyin Cumhur Tekin, Dimitrios Tsamados

This paper reports on the fabrication, experimental characterization and data transmission application of a double-gate movable body FET. As its name suggests, the proposed movable-body Micro-Electro-Mechanical FET (MB-MEMFET) is a hybrid MEMS-semiconducto ...

2008

A frequency-tunable impedance matching network based on coupled inductors for RF power amplifiers

Maher Kayal

In this paper we present an RF PA employing an output impedance matching network of the pi-type, where an inductor is variable. In order to implement this tunable inductor, the coupled-inductor technique [1] is used. Although other techniques for inductor ...

2008

Air core inductors study for DC/DC power supply in harsh radiation environment

Maher Kayal, Stefano Michelis

In high energy physics and space applications it becomes mandatory to solve specific problems concerning the power supply. In both cases, it exists a harsh radiation environment and the presence of external electromagnetic perturbations. The former prevent ...

2008

Substrate current modeling for high-voltage smart power BCD technology

Maher Kayal, François Krummenacher, Marc Pastre, Fabrizio Lo Conte

This paper presents a compact- and a macro-model for estimating and simulating the perturbations induced in the substrate by high-voltage transistors switching inductive loads. On one hand, it allows the designer to predict the amount of switching noise ge ...

2008

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