A current-mode back-end for a sensor microsystem

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

The absence of an intrinsic body diode in gallium nitride (GaN) high-electron-mobility transistors (HEMTs) leads to significant reverse conduction losses and reduced efficiency in power applications. An anti-paralleled GaN Schottky barrier diode (SBD) can be integrated to offer a low reverse turn-on voltage (VON); however, existing integration schemes often suffer from high OFF-state leakage and degraded maximum conduction current. To address this, we propose an integrated tri-gate double-channel device by

Two-stage AC/DC converters are typically realized with an Active Front End (AFE) unit followed by an isolated DC/DC unit. In single-phase systems, the AFE unit introduces a second-order harmonic ripple to the system, which can undesirably propagate to the output voltage. If the DC/DC is realized with a Series-Resonant Converter (SRC), the propagation of the second-order harmonic ripple can be neutralized by controlling its switching frequency. The operating principle and steady-state performances of this ac

The Divertor Tokamak Test (DTT) facility will be equipped with one of the largest ECRH systems envisaged for fusion research. The system is organized in 4 clusters, each one composed of 8 gyrotrons fed in pairs by four main high voltage power supplies (MHVPS), with gyrotrons and MHVPS arranged on two separate floors of a new dedicated building. Since gyrotron specifications are similar to those of ITER, a joint procurement procedure was made between Fusion for Energy and DTT. The first DTT pre-series gyrotr

The current losses due to parasitic absorption in the indium tin oxide (ITO) and amorphous silicon (a-Si:H) layers at the front of silicon heterojunction solar cells are isolated and quantified. Quantum efficiency spectra of cells in which select layers are omitted reveal that the collection efficiency of carriers generated in the ITO and doped a-Si:H layers is zero, and only 30% of light absorbed in the intrinsic a-Si:H layer contributes to the shortcircuit current. Using the optical constants of each laye

Optimized transparent conductive oxide front electrodes are vital to further increase the efficiency of thin-film silicon solar devices. We report details on the fabrication of multiscale textured zinc oxide substrates and their implementation in amorphous silicon/microcrystalline silicon tandem (micromorph) devices. Such substrates allow separate optimization of light trapping in the top and bottom cells, and efficient decoupling of transparency and conduction.We show in particular the need for sharp, nano

Several geometries have recently been proposed for spin-transfer oscillators, with the purpose of optimizing the output power and the frequency dependence on the applied current, as well as minimizing the external magnetic field required to stabilize magnetization dynamics. The two structures most compatible with applications involve hybrid multilayers, including magnetic films magnetized in the plane, as well as perpendicular to the plane of the layers - alternatively acting as polarizing layer for the cur

Glaciers influence the runoff regime of the catchments they are located in due to accumulation on to the ice surface in winter and ablation in summer. In this study we estimate the contribution of seasonally delayed glacier melt water to total runoff for current and future climate conditions. We find that the influence of glaciers on total runoff in the highly glaciated catchment of the Rhone river in Valais, Switzerland is high under current climate condi- tions and that a considerable decrease can be expe

We construct a non-equilibrium steady state and calculate the corresponding current for a mesoscopic Fermi system in the partition-free setting. To this end we study a small sample coupled to a finite number of semi-infinite leads. Initially, the whole system of quasi-free fermions is in a grand canonical equilibrium state. At t = 0 we turn on a potential bias on the leads and let the system evolve. We study how the charge current behaves in time and how it stabilizes itself around a steady state value, whi

This work reports on the physical definition and extraction of threshold voltage in Tunnel FETs based on numerical simulation data. It is shown that the Tunnel FET has the outstanding property of having two threshold voltages: one in terms of gate voltage, V-TG, and one in terms of drain voltage, V-TD. These threshold voltages can be physically defined based on the saturation of the barrier width narrowing with respect to V-G or V-D. The extractions of V-TG and V-TD are performed based on the transconductan

Growing demand for the solid state meters for power and energy measurement leads to the fully integrated Hall sensor based microsystem solutions. In this paper we describe fully integrated SOI Hall sensor based microsystem for power and energy measurements with dynamic offset cancellation. Since Hall sensor behaves like a natural four quadrant multiplier it is used to multiply the line voltage and current giving the output voltage proportional to the instantaneous power. Furthermore, voltage at the Hall out

This paper deals with cascade multilevel inverters. It focuses on asymmetrical topologies where the cell input voltages are of different values. These hybrid topologies might be used in several applications. Nevertheless, the need of DC-DC converters to supply the cells of reversible multilevel converters increases the cost and losses of such inverters. It limits their application field. Furthermore, the simultaneous-commutation problem, which increases the switching losses for some operating points, reduce

A configurable converter topology is presented as front-end converter for a locomotive that can be operated as well on a high voltage ac-system as on a medium voltage dc-system. The configurable converter is realized on the base of a multilevel chain, where all modules are fed through reversible and isolated dc-dc stages. The medium frequency transformers used in the isolation stages of the dc-dc converters allow a significant weight reduction of the locomotive, in comparison with the classical low-frequenc

There is currently both considerable interest in the physics of ELM transport in the scrape-off layer (SOL) and concern over the impact of the ELM power and particle loads on the divertor targets of future fusion reactors. This paper describes some experimental observations of the reaction of target floating potentials and currents during ELMS in TCV, relying principally on fast measurements of these parameters using tile embedded Langmuir probe arrays. Clear evidence is presented for rapid modifications in

The low aspect ratio of the mega amp spherical tokamak (MAST) allows differentiation between different forms of the H-mode threshold scaling. With optimized fuelling using inboard puffing, and a connected double null divertor (DND) magnetic configuration, the H-mode power threshold data lie about 1.7 times higher than recent scaling laws. Slight magnetic configuration changes, of the order of the ion Larmor radius, around a connected DND significantly influence H-mode access. H-mode confinement in discharge

Surface nitriding of tetragonal zirconia (t-ZrO2) has been performed with the aim of combining the optical properties of zirconium nitride (ZrN) with the hardness and toughening properties of tetragonal zirconia. A high current d.c. arc plasma source has been used to create a reactive environment of atomic hydrogen and NH radicals. Plasma analysis showed that a highly reductive atmosphere is necessary to transform the tetragonal zirconia. X-ray diffraction and transmission electron microscopy analysis show

Three 30 kV/10 mA solid state pulsed modulators have been delivered to the CRPP in Lausanne, by the company JEMA. Each modulator supplies the anode grid of a triode type gyrotron, used for heating purpose at the third harmonic in the TCV Tokamak. The main parameters of the final design are: the use of solid state technology, a floating output referred to the - 80 kV of the gyrotron cathode potential, an output voltage range of - 5 to 30 kV, I kHz square and sinusoidal modulation, fast switching off to - 5 k

The aim of this letter is to present a universal power quality conditioning system (UPQS) named after unified power quality conditioner (UPQC), which is extended by adding a shunt active filter at the load side. Its main purpose is to compensate for supply voltage and load current imperfections, such as sags, swells, interruptions, imbalance, flicker, harmonics, reactive currents, and current unbalance. Converter and control analysis is presented together with results showing the UPQS modes of operation.

A steady-state, fully noninductive plasma current has been sustained for the first time in a tokamak using electron cyclotron current drive only. In this discharge, 123 kA of current have been sustained for the entire gyrotron pulse duration of 2 s. Careful distribution across the plasma miner radius of the power deposited from three 0.5-MW gyrotrons was essential for reaching steady-state conditions. With central current drive, up to 153 kA of current have been fully replaced transiently for 100 ms. The no

The differential difference amplifier (DDA) is considered as a versatile building block for the analogue processing of floating voltages. An automatic offset compensation scheme is proposed for the DDA structure. A digital successive approximation algorithm is implemented to reduce the offset input voltages. The proposed circuit has been fabricated and tested in a 0.8 mu m CMOS technology.

PFC rectifiers are more and more used as front end circuits for low and mid sized apparatus. Especially for the high current applications, the size and weight of passive components are an important factor, also for the economic aspect. The number and size of the active switches of classical PFC scheme, together with the design of heatsinks must be carefully investigated. A new possibility has been investigated using the current sharing on a higher amount of silicon devices, together with the effect of cance

A current-mode back-end for a sensor microsystem

Chat with Graph Search

Vertically stacked double-channel tri-gate GaN HEMT and SBD with enhanced reverse conduction performance

Dynamic Analysis and Control Design of Second-Order Harmonic Active Filters based on Series-Resonant Converters

First RF operations of the gyrotron for the DTT ECRH System

Current Losses at the Front of Silicon Heterojunction Solar Cells

Nanometer- and Micrometer-Scale Texturing for High-Efficiency Micromorph Thin-Film Silicon Solar Cells

Different geometries for spin-transfer oscillators

Contribution potential of glaciers to water availability under climate change conditions in Valais, Switzerland

A partition-free approach to transient and steady-state charge currents

Threshold voltage in Tunnel FETs: physical definition, extraction, scaling and impact on IC design

SOI Hall sensor based solid state meter for power and energy measurements

New configurations for the tree-phase asymmetrical multilevel inverter

Configurable Front-End Converters for Multicurrent Locomotives Operated on 16 2/3 Hz AC and 3 kV DC Systems

ELM driven divertor target currents on TCV

Overview of recent experimental results on MAST

Nitriding of tetragonal zirconia in a high current d.c. plasma source

30 kV/10 mA solid state anode modulator for gyrotron plasma heating: design issues and results

Power quality compensation using universal power quality conditioning system

Steady-state fully noninductive current driven by electron cyclotron waves in a magnetically confined plasma

Auto-zero differential difference amplifier

A three channels, low ripple PFC rectifier using a standard power module