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Gallium Nitride (GaN) high electron mobility transistor (HEMT) is one of the promising candidates to replace existing switches in high-frequency high power converter applications. Reliability of GaN HEMT is an important issue for its commercial deployment. Online prognosis of this transistor ensures robust reliability for mission critical applications. Online prognosis requires identification of fault...
A GaN-on-Si power device is a strong candidate to replace power components based on silicon in high-end market for low-voltage applications, thanks to its electrical characteristics. To maximize opportunities of the GaN device in field applications, a package technology plays an important role in a discrete GaN power device. A few specialized package technologies having very lower stray inductance...
In this paper, the degradation at the gate oxide layer of a SiC MOSFET has been studied. The online condition monitoring was achieved by Spread Spectrum Time Domain Reflectometry (SSTDR) for the first time in SiC based devices. An accelerated aging station was built to age the power semiconductor devices in a standardized way, and power cycling test was performed to induce degradation. Finally, the...
An analysis of the degradation occurred in RF life-tests of n-type MOSFETs operated from pulsed bench for a radar application in S-band is introduced. The analysis comes accompanied with experimental results, which are used to facilitate optimization of the robustness of Power RF MOSFETs. The recorded S-parameters before and after degradation allows the observation of the corresponding changes in...
3D sequential integration requires top FETs processing with a low thermal budget (500°C). The analysis of the origin of the performance difference between Low Temperature (LT) MOSFET and high temperature standard process must take into account a potential EOT modification for short gate lengths. In this work, the difficulty of precise EOT extraction for scaled devices is observed by CV measurements...
The correlation between degradation-induced changes in two important indicators of mechanical properties, namely elongation at break (EAB) and indenter modulus (IM), is examined for flame-retardant ethylene propylene rubber (FR-EPR), silicone rubber (SiR), flame-retardant crosslinked polyethylene (FR-XLPE), and XLPE. The samples were degraded by heat or concurrently by heat and radiation. In the case...
Machines in electric vehicles are driven by switching power electronic devices and undergo variable load cycling. In transient conditions high currents and temperatures develop, forcing the electric motor and particularly the insulation materials to undergo severe multi-stress. Insulation degradation will progressively lead to short-circuits which are harmful for the traction motor, vehicle safety...
We present a multiscale modeling platform that exploits ab-initio calculation results and a material-related description of the most relevant defect-related phenomena in dielectrics (charge trapping and transport, degradation and atomic species motion) to interpret the reliability and electrical characteristics of logic and memory devices. The model is used to identify and characterize the dielectric...
The performance and low power requirement are becoming more and more challenging to fulfill for consumer product. On the opposite, a low failure rate at SoC level must be guaranteed to the end-customer. In that context, the insertion of in-situ slack monitor is known to be promising and efficient solution to manage the wear-out and more generally to minimize all margins related to manufacturing variations...
The energy efficiency of a data center largely depends on the performance of its cooling system, which consumes 30% to 40% of the total electricity. Very often, the cooling efficiency degrades over time and the degradation depends on various external factors and internal system states. This study is motivated by the need to estimate the degradation of system internal states from measured system operating...
The effect of post irradiation annealing on the following radiation degradation rate of bipolar integrated circuit parameters was estimated. The degradation rate increases significantly during the irradiation in comparison with the irradiation before the annealing.
Vehicle maintenance is a very important subject in using vehicles and proper maintenance directly affects to its longevity. This research was done to identify the real condition of a vehicle to service that vehicle on time with a service date prediction system. Engine oil ageing has been selected as the most affecting parameter to the service requirement. The viscosity of engine oil has been selected...
In this paper, a method to implement a platform of failure diagnosis and prognosis, and health monitoring based on data using Input Output Hidden Markov Models (IOHMM) is proposed. Several sensors on a diesel generator system give information such as on-line operating conditions. The goal of this work is to use on-line collected data in order to determine degradation state of the diesel generator...
In this work, a CMOS transistor array is presented, which allows performing process variability, Random Telegraph Noise and BTI/CHC aging characterization in a single chip. The array, called ENDURANCE, integrates 3136 MOS transistors, for single and massive electrical testing. This chip, together with a dedicated measurement set-up, allows programming any of these electrical tests, considerably reducing...
Chemometrics is the science of applying multivariate mathematical and statistical analysis methods to the extraction of maximum information from complex data sets and the determination of inter-relationships between variables controlling outcomes and properties.
This paper describes the role of sulphur on corrosion phenomena at the interface between the Cu ball and Al bondpad. Sulphur is usually linked to the adhesion promotor which is used to improve package robustness and second bond reliability, but can have other detrimental effects. A variety of techniques such as (in-situ) HTSL, chemical analysis of sulphur and performing a DOE with compound variants...
The contact resistance (RC) of Au wires bonded to AlCuW bond pads (98.5% Al, 0.5% Cu, 1.0% W) and pure Al bond pads was measured continuously using the high-resolution resistometric method during multiple high-temperature storage (HTS) tests. Oven storage temperatures from 200°C to 250°C were utilized to accelerate the intermetallic formation and resistance degradation at the bond interface. This...
Durability and reliability of cable lines is related to the quality of insulation materials, proper installation and maintenance during operation, as well as its mode of operation and not least by the action of degradation factors during operation. Neglecting any of these factors can significantly shorten the designed life or cause damage during operation. Producers in technical terms normally guarantee...
Degradation of olive oil under light and heat are analysed using an optical fibre based low-cost portable smartphone spectrofluorimeter. Visible fluorescence bands associated with phenolic acids, vitamins and chlorophyll centred at λ ∼ 452, 525 and 670 nm respectively are generated using near-UV excitation (LED λex ∼ 370 nm), of extra virgin olive oil are degraded more likely than refined olive oil...
Performance enhancement is critical for offering competitive CMOS solutions for advanced technology nodes. To fully leverage performance enhancement elements the device reliability impact needs to be comprehended on the CMOS circuits like SRAM and ring-oscillators. We reaffirm that time-zero and BTI induced stochastic variation are most critical for SRAM circuits while for logic circuits such as ring-oscillators...
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