Concept

Variable capacitor

Publications associées (78)

Inkjet printed capacitive transducers on flexible plastic substrates with increase stability

Nico de Rooij, Danick Briand, Francisco Molina Lopez

Inkjet printed interdigitated transducers have been produced on flexible substrates and optimized for gas sensing applications by improving the sintering conditions and employing additional passivation procedures, like electroplating with Ni or whole trans ...

2012

Single Phase Resonant LC Circuit Using a Bank of Self-Switched Capacitors

Alfred Rufer, Daniel Siemaszko, Christian Rod

This paper presents a preliminary work on the feeding of an AC dipole using a resonant circuit with a varying resonant frequency. A single phase LC oscillator containing a variable capacitor is fed by a wide band amplifier or a voltage source inverter. For ...

Institute of Electrical and Electronics Engineers2011

Polarization Reversal in BiFeO3 Capacitors: Complex Behavior Revealed by PFM

Nava Setter, Paul Muralt, Alexander Tagantsev, Igor Stolichnov, Enrico Colla, Monika Iwanowska

Polarization reversal in BiFeO3 (BFO) thin films in a parallel-plate capacitor configuration has been explored using piezo-force microscopy (PFM). Through-electrode mapping of the local piezoresponse allows for direct observation of the domain growth, whic ...

2011

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

Maher Kayal, Sylvain Maréchal, François Krummenacher

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 fully integrated IQ-receiver for NMR microscopy

Giovanni Boero, Jens Anders, Paul Sangiorgio

We present a fully integrated CMOS receiver for micro-magnetic resonance imaging together with a custom-made micro-gradient system. The receiver is designed for an operating frequency of 300 MHz. The chip consists of an on-chip detection coil and tuning ca ...

2011

Inkjet printing on paper for the realization of humidity and temperature sensors

Nico de Rooij, Danick Briand, Jérôme Courbat

We report on inkjet printing of silver nanoparticles on paper for the design of resistive temperature and capacitive humidity sensors. Temperature and humidity have shown to have an influence on the electrical and mechanical properties of the Ag printed st ...

2011

Development of hybrid organic-inorganic materials for efficient charging/discharging in electrochemical and photoelectrochemical capacitors

Nikolaos Vlachopoulos, Ulf Anders Hagfeldt

A composite system of poly (3,4-ethylenedioxythiophene)/multi-walled carbon nanotubes has been investigated and characterized as a potential charge storage material for coupled dye-sensitized solar cell/electrochem. capacitor systems. The selected material ...

2011

Inkjet Printing of Silver on Flexible Substrates for Sensing Applications

Nico de Rooij, Danick Briand, Jérôme Courbat, Francisco Molina Lopez

We report on the fabrication of a low cost sensing platform which includes printed / electroplated resistive thermometers and capacitive-based humidity sensors working at ultra low power consumption. Both types of devices were integrated on the same polyme ...

2011

RF MEMS Switches for Wide-band (5 - 40 GHz), Tuneable Filters and DMTL Phase Shifters

Montserrat Fernandez-Bolanos Badia

In wireless communications, radio frequency micro-electro-mechanical systems (RF MEMS) technology is attracting tremendous interest across the world as the needs of frequencies gets higher, data bandwidth gets larger and multiple broadband signals have to ...

EPFL2010

Broadband MEMS-Tunable High-Index-Contrast Subwavelength Grating Long-Wavelength VCSEL

Elyahou Kapon, Alexandru Mereuta, Vladimir Iakovlev, Alexei Sirbu, Andrei Caliman, Jesper Mork

A widely-tunable single-mode 1.3 mu m vertical-cavity surface-emitting laser structure incorporating a microelectromechanical system-tunable high-index-contrast subwavelength grating (HCG) mirror is suggested and numerically investigated. A linear tuning r ...

Institute of Electrical and Electronics Engineers2010

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