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.
FPGAs are very sensitive to their operating conditions which can induce runtime errors. To prevent timing errors, FPGA manufacturers propose static timing analysis tools to ensure that the application to be implemented in the FPGA will work correctly at the expected frequency. However, that static timing analysis is corner-based and is thus valid for a set of optimal or recommended operating conditions...
We utilize high power VCSEL arrays for several applications where high efficiency especially at high operating temperatures is essential. Our approach to design VCSEL devices optimized for the requirements of these applications is presented.
Within a long-lasting project, differently pre-aged, as well as brand new medium voltage (MV) paper insulated lead covered cables (PILC) have been artificially aged. Hereby, the dissipation factor and the partial discharges (PD) have been regularly monitored over the complete lifetime of the accelerated aged samples. Additionally, measurement cycles with varied temperatures and voltages have been...
For photovoltaic cells efficiency is the quality of material key ingredient. Impurities in this material create recombination centers which cut down the effective carrier charge lifetime. The method of dark current measurement, which is described in paper, can be used for dominant impurity determination.
Corona discharge in oil is one of a number of important defects that may exist in a power transformer. This paper investigates the corona in oil from a needle-plane geometry. Different aspect ratios of the geometry are investigated as well as the temperature dependence from 25 to 100°C. The corona discharges are measured both in time domain with oscilloscopes and as phase resolved patterns. By using...
In this work, we present the study on Separate Absorption, Charge and Multiplication (SACM) APDs utilising In0.52Al0.48As as the multiplication layer and In0.53Ga0.47As/GaAs0.51Sb0.49 periodic heterostructures as the absorption layer. In0.52Al0.48As lattice matched to InP has been shown to have superior excess noise characteristics and multiplication with relatively low temperature dependence compared...
Power and thermal considerations are becoming limiting factors for submicron circuits as technology scales down. In order to detect abnormal temperature changes so as to detect defects on chip, and increase reliability and service life of devices, an all CMOS temperature sensor for submicron circuits' test is proposed. A current proportion to absolute temperature is generated for achieving linear...
We have studied the temperature dependence of the forward dark current in a Si PIN photodiode. The temperature variations of the ideality factor and saturation current suggest that, depending on temperature and bias, both tunneling enhanced interface recombination and bulk recombination contribute to the conduction process. Furthermore, the capacitance measurements reveal that the doping density distribution...
The majority of integrated voltage references have, so far, been limited to a minimum supply voltage above 0.7-V often due to the voltage headroom required for the forward-biased operation of a PN-junction. This paper reviews design techniques for low voltage reference design and explores the feasibility of designing a voltage reference with a supply voltage below 0.7-V in a standard CMOS process...
Voltage-based (VMPPT) and current-based (CMPPT) maximum power point tracking are simple and practical approaches for improving the efficiency of photovoltaic systems A problem in practical implementation of these trackers is the impact of array temperature deteriorating their accuracy. This paper uses theoretical and experimental data and analysis to investigate the impact of insolation and temperature...
A new silicon controlled rectifier low voltage triggered (SCR-LVT), to be adopted as protection structure against electrostatic discharge (ESD) events, has been developed and characterized. A high holding voltage has been obtained thanks to the insertion of two parasitic bipolar transistors, achieved adding a n-buried region to a conventional SCR structure. These two parasitic transistors partially...
We report thermoelectric characterization of Bi2-xSbxTe3 (x = 0.5, 1.0, and 1.5) synthesized by a solvothermal method using DMF as solvent. For Bi2Te3, the size of the edge and thickness of the hexagonal nanoplatelets are 200-250 nm and 20-25 nm, respectively. Bi2Te3 nanosheets appear to grow epitaxially from the surface of the Te tubes, which forms in the first step and acts as the template for the...
Cooling is important to keep the temperatures of the highly integrated silicon electronic devices and power devices e.g. power MOSFET, IGBT. Yamaguchi et al. have proposed a new scheme to cool down the devices by its own current named ldquoself-cooling devicerdquo, in which the cooling process uses Peltier effect. In the proposed scheme, we should use the materials that have high thermal conductivity,...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
Optical communication systems based on dense wavelength division multiplexing (DWDM) would benefit from the ability to adjust the operating wavelength of a laser transmitter. Previous attempts, including thermal adjustment, etalon based wavelength locking, and various types of optical frequency and phase locked loops such as the Pound-Drever-Hall technique suffer from weaknesses including sensitivity...
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.