Tres Cantos, Spain
Tres Cantos, Spain

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Godignon P.,Autonomous University of Barcelona | Jorda X.,Autonomous University of Barcelona | Vellvehi M.,Autonomous University of Barcelona | Perpina X.,Autonomous University of Barcelona | And 7 more authors.
IEEE Transactions on Industrial Electronics | Year: 2011

This paper reports on the fabrication technology and packaging strategy for 300-V 5-A silicon carbide Schottky diodes with a wide temperature operation range capability (between -170°C and 300°aC). These diodes have been designed for harsh environment space applications such as inner Solar System exploration probes. Different endurance tests have been performed to evaluate the diode behavior when working at a high temperature and under severe thermal cycling conditions (ranged from -170 °C to 270 C). The radiation hardness capability has been also tested. It has been found that the hermeticity of the package in a neutral atmosphere is a key aspect to avoid an electrical parameter drift. Moreover, the use of gold metallization and gold wire bonds on the anode allows reducing the diode surface and bonding degradation when compared to Al-containing technology. On the back-side cathode contact, the Ti/Ni/Au metallization and AuGe combination have shown a very good behavior. As a result, the manufactured diodes demonstrated high stability for a continuous operation at 285 C. © 2006 IEEE.


Esquivias I.,Technical University of Madrid | Tijero J.-M.G.,Technical University of Madrid | Barbero J.,Alter Technology Group Spain | Lopez D.,Alter Technology Group Spain | And 3 more authors.
Proceedings of the European Conference on Radiation and its Effects on Components and Systems, RADECS | Year: 2011

We present an evaluation of the effects of proton and gamma irradiation on the performance of GaSb-based 2.1 μm laser diodes lasers for space applications. The study is focused on the effects of radiation on the Power-Current, Current-Voltage and Wavelength-Current-Temperature characteristics of the lasers. No significant radiation damage has been found. © 2011 IEEE.


Oton E.,Technical University of Madrid | Perez-Fernandez J.,Alter Technology Group Spain | Lopez-Molina D.,Alter Technology Group Spain | Quintana X.,Technical University of Madrid | And 2 more authors.
IEEE Photonics Journal | Year: 2015

Passive liquid crystal (LC) devices are becoming an interesting alternative for the manufacturing of photonic devices in spatial applications. These devices feature a number of advantages in this environment, the lack of movable parts, and of exposed electronics being among the most outstanding ones. Nevertheless, the LC material itself must demonstrate its endurance under the harsh conditions of space missions, including launch and, perhaps, landing. In this paper, we present the environmental testing of an LC device for space applications. A number of LC based beam steering devices were manufactured, characterized, and tested in a series of destructive and nondestructive tests defined by the European Space Agency (ESA). The purpose was to evaluate the behavior and possible degradation of the LC response in simulated space environments. Device fabrication and testing was done within an ESA-funded project, whose purpose was the design, manufacturing, and characterization of adaptive optical elements, as well as the execution of qualification tests on the devices in space-simulated conditions. © 2015 IEEE.

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