Concept

Dissipation factor

Publications associées (80)

Effective permittivity of porous media: a critical analysis of the complex refractive index model

The availability of reliable constitutive models linking he bulk electric properties of porous media to their inner structure is a key requirement for useful quantitative applications of noninvasive methods. This study focuses on the use of dielectric meas ...

2008

Ultralow-dissipation optomechanical resonators on a chip

Tobias Kippenberg, Albert Schliesser

Cavity-enhanced radiation-pressure coupling of optical and mechanical degrees of freedom gives rise to a range of optomechanical phenomena, in particular providing a route to the quantum regime of mesoscopic mechanical oscillators. A prime challenge in cav ...

2008

Power and Area Efficient Circular-Memory Switched-Capacitor FIR Baseband Filter for WCDMA/GSM

Rafal Tomasz Dlugosz

This paper presents a new two-sections architecture of a low power switched capacitor (SC) finite impulse response (FIR) filter suitable for base-band signal processing in WCDMA and in GSM standards. The low power operation is possible due to several optim ...

2008

Flexible Architecture of Ultra-Low-Power Current-Mode Interleaved Successive Approximation Analog-to-Digital Converter forWireless Sensor Networks

Rafal Tomasz Dlugosz

A novel 8-bit current mode interleaved successive approximation (SAR) analog-digital converter (ADC) has been proposed. The proposed converter architecture is very flexible. Using two control DC voltages and one reference current, the converter can be tune ...

2007

0.35 μm 22μW Multiphase Programmable Clock Generator for Circular Memory SC FIR Filter For Wireless Sensor Applications

Rafal Tomasz Dlugosz

The paper presents the programmable multiphase clock generator for switched-capacitor finite impulse response (SC FIR) circular memory filters. The proposed programmable clock circuit enables easy division of such kind of filters into different orders smal ...

2006

Evidence of high dissipation in magnetization reversal processes of five Co/Cu bilayers

Jean-Philippe Ansermet, Santiago Serrano Guisan

Heat and charge transport perpendicular to the plan in five Co/Cu stacks are studied using AC temperature gradients in the presence of a DC current. Large peaks in AC voltage response versus applied field are observed. This effect, measured only in reversi ...

Elsevier2006

Ferroelectric-dielectric tunable composites

Nava Setter, Alexander Tagantsev

The dielectric response of ferroelectric-dielectric composites is theoretically addressed. Dielectric permittivity, tunability (relative change of the permittivity driven by dc electric field), and loss tangent are evaluated for various composite models. T ...

2006

Synthesis and dielectric characterization of potassium niobate tantalate ceramics

Nava Setter

The preparation and dielectric properties of potassium niobate tantalate (KTN) have been investigated with the aim of exploring the material's potential for ferroelectric tunable applications. The samples were prepared both by conventional sintering in air ...

2005

3D Finite Element Simulations of strip lines of a YBCO/Au Fault Current Limiter

Francesco Grilli, Joseph Duron, Bertrand Dutoit

Geometrical aspects of the design of fault current limiters (FCL) have a great impact on their performance. Recently, the University of Geneva have presented optimized geometries obtained by splitting the FCL into many small dissipative lengths in order to ...

2005

Piezoelectric micromachined ultrasonic transducers based on PZT thin films

Nava Setter, Paul Muralt, Nicolas Ledermann

This paper describes fabrication and characterization results of piezoelectric micromachined ultrasonic transducers (pMUTs) based on 2-mu m-thick Pb(Zr0.53Ti0.47O3) (PZT) thin films. The applied structures are circular plates held at four bridges, thus par ...

2005

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