The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a survivability and reliability investigation for integrated actuator and brushless motor drive electronics packaging and components under an extreme low temperature and high thermal cycle environment. A universal brushless motor drive electronics assembly has been designed, built, and thermal cycle tested for use in Mars, Moon, and asteroid type cold environments without the need...
NASA's The New Millennium Program (NMP) approach to space flight validation of advanced technologies is to alternate between subsystem and system flight validations, candidates for each NMP project (subsystem or system) are competed through a NASA Research Announcement process, and proposal selection is determined by NASA Headquarters. Space Technology 8 (ST8) is the second NMP subsystem project....
Chip-on-board (COB) technology is a viable approach for miniaturization in space electronics. Although COB technology has been widely used in many commercial products, comprehensive and systematic studies are needed for space application. Temperature extremes (-125degC to +85degC) that the Mars Science Laboratory (MSL) electronics will be exposed to pose challenges in spacecraft electronics design...
Electronics, without requiring heater power or enclosure in a centralized "warm electronics box," will need to survive mean surface temperatures of -120degC to +20degC for an extended (>2 years) Martian mission and an operational temperature up to 85degC. These surface temperatures range over one Martian day or typical cycle. Since the electronics will need to survive extended thermal...
The normally off silicon carbide power vertical JFET (VJFET) can perform the role of switch, rectifier, or switch with anti-parallel rectifier. This innovative feature eliminates the need to qualify a separate diode that can withstand the rugged environment of, for example, the surface of Venus on-board a surface planetary probe, or that can be derated to exhibit high-reliability in merely harsh terrestrial...
We highlight how the vertical cavity surface emitting laser, or VCSEL, empowers interprocessor communication for grids of spaceborn computers. To put a face on how VCSELs benefit spaceflight multi-processors, we quantify the scalability of point-to-point optical channels, implemented to achieve fault tolerance and connectivity tuned from sparse to dense. VCSELs can free designers from the tyranny...
Is there a business case, for on-board wire integrity sensors for aero-spacecraft? Wire integrity management using on-board sensors seems a natural fit for future Integrated System Health Management (ISHM). Government and private enterprises are presently developing in-situ wire integrity sensors. Is there a value proposition for wire integrity management in manned aero-spacecraft? How would risk...
Model-based design (MBD) tools to predict the performance and useful life of commercial-off-the-shelf (COTS) components and COTS-based systems outside of their rated temperature range are described. The modeling tools will differ from all known technologies in that they facilitate the capture of experimental data on COTS devices that in turn is automatically transformed through novel modeling methods...
Silicon-carbide (SiC) semiconductor devices have numerous potential advantages over their conventional silicon counterparts (i.e., higher switching frequencies, lower switching losses, higher temperature of operation, higher blocking voltages, higher thermal conductivity, radiation hardness, etc.). These advantages have sparked the birth of a new generation of power converters, distinguishing themselves...
In this paper, we present a design for reliability approach on analog to digital (A/D) converters for low temperature applications. Parametric degradation, including drain saturation and linear currents, threshold voltage, transconductance and drain conductance, have been characterized to translate the hot carrier aging impact on A/D circuits under low temperatures. Both substrate current profile...
Commercially off the shelf (COTS) available reconfigurable architectures are becoming popular for applications where high dependability, performance and low costs are mandatory constraints such as space applications. We present a unique SEE (single event effect) mitigation technique based upon temporal data sampling and weighted voting for synchronous circuits and configuration bit storage for reconfigurable...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.