simulation – Page 14 – TechConnect Briefs

Large-scale Simulations of Adhesion in Dense Polymer Melts

Sides S.W., Grest G.S., Stevens M.J., Sandia National Laboratories, US

We study adhesion between a polymer melt and substrate due to tethered chains on the substrate surface. We have performed extensive molecular dynamics simulations to study the effect of tethered chain density (S), tethered chain [...]

Modeling and Mass-Distance Scaling of a Nanometer Starburst Polymer

Rothschild W.G., Wayne State University, US

We report numerical scaling of cumulative mass with intramolecular distance of a model of one of the four segments of the hyperbranched poly(propylene!imine)-dendr-DAB(CN)64 molecule. Assuming prevalent repulsive link!link forces gives a power law relation with [...]

Three-Dimensional Simulation of AlxGa1-xAs/GaAs Gradual Heterojunction Bipolar Transistor

García-Loureiro A.J., Pena T.F., Prat Viñas Ll., Univ. Santiago de Compostela, ES

In this work we present the results of the simulation of AlxGa1-xAs/GaAs gradual heterojunction bipolar transistor using a parallel three-dimensional semiconductor device simulator. This simulator is based on drift-diffusion transport model. In order to solve [...]

Broadband Millimeter Wave Finline Antenna Simulation and Performance

Fu J.S., Ng C.L., Kwang Y., Sia E.K., Lu C., Nanyang Technological University, SG

Analysis on fin line antenna with broadband and tolerable VSWR characteristic was done. Emphasis were placed in the formulation of the taper equations for the transmission fin line and radiation section and verification of good [...]

Substrate Current Simulations at Elevated Temperatures

Lyumkis E., Mickevicius R., Polsky B., Loechelt G., Zlotnicka A., Thoma R., Integrated Systems Engineering, Inc., US

We report results of hydrodynamic simulations and measurements of substrate currents in submicron MOSFET. Both simulations and measurements show anomalous dependence of the substrate current on lattice temperature, which is consistent with previously published experimental [...]

A Qualitative Study on Global and Local Optimization Techniques for TCAD Analysis Tasks

Binder T., Heitzinger C., Selberherr S., Technical University Wien, AT

We compare the two well-known global optimization methods, simulate annealing and genetic optimization, to a local gradient-based optimization techniques. We rate the applicability of each method in terms of the minimal achievable target value for [...]

Bonding Pad Resistance. A Combined Approach

Bouche G., Gonella R., Sabouret E., Technology Modeling STMicroelectronics, FR

Introducing new intermetal materials, with improved electrical properties but lowered mechanical resistance, requires in terms of reliability to design new structures for pads. The test structures under fabrication have been simulated to try and evaluate [...]

Finite Element Analysis in the Development of MEMS-based Compound Grating (MCG)

Yao Y., Castracane J., Xu B., Olson S., Eisden J.V., University at Albany-SUNY, US

This paper presents the development of the 1 mm ruled MEMS-based Compound Grating (MCG) in which the structural material of the rulings is SiO2 coated with Cr/Au as the top electrode. The MEMS simulation package [...]

Modeling and Simulation of a Single Crystal Silicon Microactuator for Hard Disk Drives

Jianqiang M., Shixin C., Yi L., Data Storage Institute, SG

The modeling and simulation of a single crystal silicon microactuator for high-density hard disk drives are described in this paper. The microactuator is fabricated by LISA process, which has an electrically isolated structure directly from [...]

Electromechanical and Microwave S-parameter Properties of a Wide Tuning Range MEMS Tunable Capacitor

Chen J., Zou J., Liu C., Kang S-M, University of Illinois, CN

We present the electromechanical and microwave properties of a novel micromachined parallel-plate tunable capacitor with a wide tuning range. Different from conventional two-parallel-plate tunable capacitors, this novel tunable capacitor consists of one suspended top plate [...]