Publications by Pavel Kejik | EPFL Graph Search

Related publications (32)

True 2D CMOS integrated Hall sensor

We have designed and realized a new integrated Hall structure that converts the magnetic field vector in the chip plane, into an ac signal, whose amplitude and phase correspond to the magnitude and direction of the field, respectively. It is the first Hall ...

2007

CMOS magnetic sensors with integrated ferromagnetic parts

Radivoje Popovic, Pavel Kejik, Predrag Drljaca

The paper deals with Hall and flux-gate magnetic field sensors consisting of integrated combination of CMOS ASICs and planar ferromagnetic components. Ferromagnetic parts are made of a soft amorphous alloy, integrated at the CMOS wafer in a post-processing ...

Elsevier2006

Magnetic field sensor for measuring direction of a magnetic field in a plane

Radivoje Popovic, Pavel Kejik

A magnetic field sensor for measuring a direction of a magnetic field in a plane comprises a sensing structure (4) comprising a ring-shaped well (10), a plurality of contacts (11) of equal size placed at equal distance from each other along the ring-shaped ...

2008

Offset compensation based on distributed Hall system architecture

Radivoje Popovic, Pavel Kejik

Integrated Hall devices have the great advantage, over other magnetic sensors, that they can be fully fabricated by a standard CMOS process. However they are known to have a relatively large offset (i.e. residual voltage at zero magnetic field). Techniques ...

2010

The High-Resolution Magnetic Camera: A Novel Sensor for Eddy Current Testing

Hannes Bleuler, Marco Picasso, Pavel Kejik, Roland Moser, David Florian Hippert

Eddy current techniques are often used to detect and, in some advanced applications, to characterize fatigue surface-breaking cracks appearing in mechanical parts. One of the major difficulties in this approach is to reliably separate the crack contributio ...

Ios Press2014

Three-axis teslameter with integrated hall probe free from the planar hall effect

Radivoje Popovic, Pavel Kejik, Enrico Schurig

The first commercially available teslameter with a fully integrated 3-axis Hall probe is described. The Hall probe chip contains horizontal and vertical Hall elements, analogue electronics, and a synchronisation circuit. A horizontal Hall element measures ...

2006

Integrated Hall Microsystem with Current Re-Use

Radivoje Popovic, Pavel Kejik, Predrag Drljaca

A new architecture of a Hall microsystem for low-power applications is presented. The innovation in this paper lies in the re-use of the electric current for biasing of several parts in the microsystem permitting substantial reduction of the current consum ...

American Scientific Publishers2007

Three-Axis Teslameter with Integrated Hall Probe

Radivoje Popovic, Pavel Kejik, Enrico Schurig

The first commercially available teslameter with a fully integrated three-axis Hall probe is described. The Hall probe chip contains horizontal and vertical Hall elements, analog electronics, and a synchronization circuit. A horizontal Hall element measure ...

Institute of Electrical and Electronics Engineers2007

First Fully CMOS-Integrated 3D Hall Probe

Radivoje Popovic, Pavel Kejik, Enrico Schurig

We present the first fully CMOS-integrated 3D Hall probe. The microsystem is developed for precise magnetic field measurements in the range from mT up to tens of tesla in the frequency range from DC to 30 kHz and with a spatial resolution of about 150 μm. ...

2005

Hall sensor and method of operating a Hall sensor

Giovanni Boero, Radivoje Popovic, Pavel Kejik, Predrag Drljaca

A Hall sensor comprises a Hall element (1; 30; 31; 60) and an amplifier (2; 32; 33). The Hall element is placed inside the amplifier so that the current flowing through the Hall element also flows through the transistors of an amplifier stage of the amplif ...

2006

Characterization of Surface Cracks Through The Local Magnetic Field Induced by Eddy Currents

Hannes Bleuler, Marco Picasso, Pavel Kejik, Roland Moser, David Florian Hippert

It is important to reliably characterize cracks in metallic mechanical parts in order to assess the serenity of damage due to fatigue. The most important parameter for this is the crack depth. This is notoriously difficult with standard Eddy current techni ...

Ios Press2014

Micro Fluxgate Sensor with Cascaded Planar Ring Cores

Pavel Kejik, Ozge Zorlu

In this paper, we present a new microfabricated fluxgate sensor structure having cascaded planar rings as the ferromagnetic core. A circular magnetic excitation is provided with a rod passing through the FeNi rings as a sewing thread. Planar coils placed u ...

2009

Submicrometer Hall devices fabricated by focused electron-beam-induced deposition

Jürgen Brugger, Niels Quack, Giovanni Boero, Patrik Willi Hoffmann, Radivoje Popovic, Pavel Kejik, Schahrazede-Lila Mouaziz, Tristan Bret

Hall devices having an active area of about (500 nm)(2) are fabricated by focused electron-beam-induced deposition. The deposited material consists of cobalt nanoparticles in a carbonaceous matrix. The realized devices have, at room temperature, a current ...

American Institute of Physics2005

Low-power 2-D fully integrated CMOS fluxgate magnetometer

Radivoje Popovic, Pavel Kejik, Franck Vincent, Predrag Drljaca

In this paper, we present a low-power, two-axis fluxgate magnetometer. The planar sensor is integrated in a standard CMOS process, which provides metal layers for the coils and electronics for the signal extraction and processing. The ferromagnetic core is ...

Institute of Electrical and Electronics Engineers2005

Layout and Architecture Issues in Hall based CMOS microsystems

Pierre-André Farine, Pavel Kejik

The Hall cells intended for industrial applications are mainly produced in silicon integrated circuit technology. Recently, the increased use of other technologies, such as GaAs, InAs and InSb, have been reported. However, a single chip solution comprising ...

Czech Technical University in Prague, Faculty of Electrical Engineering2012

An Integrated Probe for Electromagnetic NDT Inspection

Pavel Kejik

Electromagnetic techniques present definite advantages for Non Destructive Testing such as no need for surface couplant, potential for miniaturization, and fast scanning rates. They suffer, however, from a lack of reliability when crack sizing capabilities ...

2010

Purely CMOS Angular Position Sensor Based on a New Hall Microchip

Radivoje Popovic, Pavel Kejik

This paper presents a new technique to sense the direction of the magnetic field, enabling a new generation of contactless 360 degrees absolute angle encoders. The sensor consists of a microchip that contains a special ring-shaped Hall element. It is the f ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2008

Submicrometer Hall devices fabricated by focused electron-beam-induced deposition

Jürgen Brugger, Niels Quack, Giovanni Boero, Patrik Willi Hoffmann, Radivoje Popovic, Pavel Kejik, Schahrazede-Lila Mouaziz, Tristan Bret

Hall devices having an active area of about (500 nm)2 are fabricated by focused electron-beam-induced deposition. The deposited material consists of cobalt nanoparticles in a carbonaceous matrix. The realized devices have, at room temperature, a current se ...

2005

An Orthogonal Fluxgate-Type Magnetic Microsensor

Radivoje Popovic, Pavel Kejik, Franck Vincent, Ozge Zorlu

In this paper, we present a new microfabricated orthogonal fluxgate sensor structure. The sensor consists of an electroplated copper excitation rod surrounded by an electroplated permalloy layer and has planar pick-up coils for signal detection. The use of ...

2006

An orthogonal fluxgate-type magnetic microsensor with electroplated Permalloy core

Radivoje Popovic, Pavel Kejik, Ozge Zorlu

In this paper, we present a new microfabricated orthogonal fluxgate sensor tructure. The sensor consists of an electroplated copper excitation rod surrounded by an electroplated Permalloy layer and has planar pick-up coils for signal detection. The use of ...

Elsevier2007