CH – Page 15 – TechConnect Briefs

Modelling and Optimization of a Vaporizer for Inhalation Drug Therapy

de Heij B., de Rooij N.F., van der Schoot B., de Heij B., de Rooij N.F., Bo H., Hess J., University of Neuchätel, CH

We present a piezo-electrically driven droplet generator with a large number of nozzles working in parallel and operating in the Drop On Demand mode. This device is build as part of a system for Inhalation [...]

Simulation of the Piezo-Tunnel Effect

Friedrich A.P., Besse P.A., Bächtold M., Popovic R.S., Swiss Federal Institute of Technology of Lausanne, CH

We present a new model of the piezo-tunnel effect in a heavily doped silicon p-n junction. Our approach is based on the coupling of a strain-dependent description of the energy exterma in the valence and [...]

Offset Analysis in CMOS Magnetotransistors by Numerical Simulation

Metz M., Baltes H., ETH Zürich, CH

Signal offset in magnetotransistors is for the first time analyzed by numerical simulation. Offset needs to be mini-mized to improve the accuracy of low cost CMOS contact-less angle detection systems. The offset is an unwanted [...]

Modelling an NMR Probe for Magnetometry

Boero G., Schlaefli D., Besse P.A., Popovic R.S., Swiss Federal Institute of Technology, CH

A model of an NMR magnetometer probe head, based on the Bloch equations, has been developed and implemented in a C-program. The program permits to simulate pulsed and continuous wave NMR experiments with a probe [...]

Modeling of Stress Induced Hysteresis in Piezo-Resistive Analysis

Lien H-P, ISE, CH

The impact of mechanical stress on electrical characterizations of microelectronic circuitry is a major design issue in development of sensors and integrated micro-electro-mechanical systems. Because the electrical properties of semiconductors are in uenced by external [...]

Optimal Time Stepping in the Thermo-mechanical Finite Element Simulation of IGBTs Modules

Tronel Y., Fichtner W., ETH Zürich, CH

In the analysis of the thermo-mechanical response of the wire bond connection found e.g in IGBTs modules, it has been found that the level of stresses are within the plastic range [1]. Therefore an incremental [...]

Acceleration of Inductance Extraction by Means of the Monte Carlo Method

Leonhardt G., Fichtner W., Swiss Federal Institute of Technology, CH

With increasing signal frequencies inductive effects of metallic interconnections in all kinds of packages become more and more important for the electrical behavior of a circuit. During the design process it is therefore of interest [...]

Analytical Study of Vertical Hall (VH)-Devices Using an Adapted Conform Mapping Technique

Besse P.A., Schott C., Popovic R.S., EPFL, CH

We adapt the conforrn mapping technique to the analytical calculation of two dimensional vertical Hall (VH)-devices with five electrical contacts. With our new method the finite size of the two output current electrodes is taken [...]

2D Nonlinearity Simulation of the Vertical Hall Sensor Using SESES

Schott C., Randjelovic Z., Waser J-M, Popovic R.S., EPFL, CH

Buried silicon vertical Hall devices have been accurately simulated in 2D under the condition of a varying magnetic field up to 2 Tesla using the numerical FEM device simulator SESESTM. A field dependent Hall scattering [...]

Modeling Semiconductor Optical Devices

Sartoris G., ETH-EPFL, CH

n this article, numerical methods for modeling photonic devices having coupled electrical and optical fields are presented. The governing equations characterizing the problem are presented as well as algorithms for computing numerical solutions. The coupling [...]