Publicaties

The supply of electrical energy to home, commercial, and industrial users has become ubiquitous, and it is hard to imagine a world without the facilities provided by electrical energy. Despite the ever increasing efficiency of nearly every electrical application, the worldwide demand for electrical power continues to increase, since the number of users and applications more than compensates for these technological improvements. In order to ...

Reported is a high-voltage DC-DC buck converter to interface energy harvesters in ultra-low-power wireless sensing applications. A measured efficiency between 61 and 91% has been obtained for input power between 10 and 1000 μW and for a large input voltage range between 5 and 60 V. To minimise the power consumption of the control circuits, an asynchronous implementation was used with a zero static power high-voltage level shifter and a widely ...

The shielding of buried three-phase high-voltage power lines can be done by placing them in conducting ferromagnetic U-shaped gutters covered with plates. In case of a perfect electrical contact between adjacent gutters and between adjacent cover plates, induced currents in the shield efficiently reduce the magnetic field generated by the cables. As however a perfect contact cannot be guaranteed, in practice, it is useful to quantify the effect ...

A fully integrated DC–DC converter that uses isolated switched-capacitor (SC) cores in a stacked way is presented. The converter can transform a wide input voltage range from 7.5 up to 42 V by the multiple available voltage conversion ratios (VCRs), which are realized through reconfiguration of the stackable cores. In addition, stacking simplifies the design to the low-voltage isolated SC core. Level shifters are included to fulfill the ...

This work provides an overview of our GaN-on-Si activity for high voltage applications. We will discuss the failure mechanisms of GaN-on-Si devices by electrical characterization and TCAD simulations. The main issues of the use of the Si as substrate are identified and addressed. A breakdown voltage as high as 1050 V and a specific on-resistance as low as 2 mOhm·cm2have been achieved. ©The Electrochemical Society.

Copyright © 2014 John Wiley & Sons, Ltd. A continuous-time (CT) ΣΔ modulator for sensing and direct analog-to-digital conversion of nA-range (subthreshold) currents is presented in this work. The presented modulator uses a subthreshold technique based on subthreshold source-coupled logic cells to efficiently convert subthreshold current to digital code without performing current-to-voltage conversion. As a benefit of this technique, the ...

In this paper we demonstrate excellent memory performances of a 90nm CMOS-friendly W\Al2O3\TiW\Cu CBRAM cell integrated in a 1T1R configuration and withstanding the back-end of line thermal budget of 400°C. The cell exhibits low-power and highly controlled set and reset operations, allowing reversible multilevel programming controlled by both the set current and the reset voltage. Low-voltage (<3V) operation is obtained down to 10ns-long ...

The internet is becoming the ubiquitous tool that is changing the lives of so many citizens across the world. Commerce, government, industry, healthcare and social interactions are all increasingly using internet applications to improve and facilitate communications. This is especially true for videoenabled applications, which currently demand much higher data rates and quality from data networks. High definition TV streaming services are ...

This paper describes a mixed-signal ECG System-on-Chip (SoC) that is capable of implementing configurable functionality with low-power consumption for portable ECG monitoring applications. A low-voltage and high performance analog front-end extracts 3-channel ECG signals and single channel electrode-tissue-impedance (ETI) measurement with high signal quality. This can be used to evaluate the quality of the ECG measurement and to filter motion ...

In this paper the use of shape memory alloy (SMA) wire actuators for high gas flow control is investigated. A theoretical model for effective gas flow control is presented and gate microvalve prototypes are fabricated. The SMA wire actuator demonstrates the robust flow control of more than 1600 sccm at a pressure drop of 200 kPa. The valve can be successfully switched at over 10Hz and at an actuation power of 90 mW. Compared to the current ...