Physics-based closed-form inductance expression for compactmodeling of integrated spiral inductors

A closed-form inductance expression for compact modeling of integrated inductors is presented. The expression is more accurate than previously published closed formulas. Moreover, due to its physics-based nature, it is scalable. That is demonstrated by comparison with the measured inductance for a complete set of inductors with different layout parameters     

Investigation of PECVD dielectrics for nondispersivemetal-insulator-metal capacitors

Metal-insulator-metal (MIM) capacitors with PECVD nitride exhibit trap-induced dispersive behavior, which leads to degradation in capacitor linearity at low frequencies, limiting the accuracy in precision analog circuits. While LPCVD oxide results in nondispersive behavior, the high deposition temperature excludes the use of LPCVD dielectrics for MIM capacitors using the standard back-end metal layers as capacitor bottom plates. The latter is preferred in view of the low substrate coupling needed for RF applications. In this work, alternative PECVD dielectrics have been investigated with respect to frequency dependence of voltage linearity, hysteresis, matching, and leakage characteristics. It will be shown that ONO stacks offer a combination of good voltage linearity, absence of dispersive behavior and hysteresis, excellent matching, and low leakage     

Design and Expected Performance of GISMO-2, a Two Color Millimeter Camera for the IRAM 30 m Telescope

We present the main design features for the GISMO-2 bolometer camera, which we build for background-limited operation at the IRAM 30 m telescope on Pico Veleta, Spain. GISMO-2 will operate simultaneously in the 1 and 2 mm atmospherical windows. The 1 mm channel uses a \(32 \times 40\) TES-based backshort under grid (BUG) bolometer array, the 2 mm channel operates with a \(16 \times 16\) BUG array. The camera utilizes almost the entire full field of view provided by the telescope. The optical design of GISMO-2 was strongly influenced by our experience with the GISMO 2 mm bolometer camera, which is successfully operating at the 30 m telescope. GISMO is accessible to the astronomical community through the regular IRAM call for proposals.     

Reconfiguring flexible machine modules of a PCB assembly line

Assembly of electronic components to Printed Circuit Boards (PCB) is a complicated manufacturing process and therefore its control is usually divided into several subtasks which are handled separately. We consider the combined task of determining a machine configuration and line balancing for a single assembly line of interconnected, reconfigurable machine modules and one PCB type in production. The modules can be tailored to the needs of each PCB type by suitable assignments for placement heads, nozzles and feeders. Out of these, the component-to-machine assignment appears to be most difficult and we propose five different solution methods for it; brute force, random, greedy, local search and genetic algorithm. The genetic algorithm outperformed the other methods in practical test.     

Determination the efficiency of open mixing screws

Our goal is the determination of the material flow processes around the mixing screws and introducing a new mixing index which can characterize the perform     

Poly(N-methylaniline) coatings on stainless steel by electropolymerization

Poly(N-methylaniline) (PNMA) coatings have been electropolymerized on 304 stainless steel alloy by potentiodynamic, galvanostatic and potentiostatic synthesis techniques from aqueous solutions of 0.1 M N-methylaniline (NMA) and 0.3 M oxalic acid. Characterization of PNMA coatings was carried out by cyclic voltammetry, UV-Vis and FTIR spectroscopy techniques. Corrosion behavior of PNMA coated stainless steel electrodes was investigated using linear anodic potentiodynamic polarization, Tafel test, chronoamperometry and electrochemical impedance spectroscopy (EIS) techniques in 0.5 M aqueous HCl solutions. Corrosion test results showed that PNMA coatings possessed protection to uncoated stainless steel against corrosion.