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This paper presents the in-flight charge-coupled device (CCD) dark characterization of the Suomi National Polar-orbiting Partnership (S-NPP) Ozone Mapping Profiler Suite (OMPS). Data from OMPS's three different CCD detector arrays have been collected to characterize in-flight detector behaviors. It is of our primary interest in the evolution and trend of the dark current as well as the signal distribution...
Spin Transfer Torque Magnetic Random Access Memory (MRAM) possesses a unique combination of high speed, high endurance, non-volatility, and small cell size. Among the emerging new memory technologies, including phase change memory, resistive random access memory, and conductive bridging random access memory, Spin Transfer Torque MRAM is the only candidate with the potential for unlimited endurance,...
As generally acknowledged, the main drawback of a fully-digitalized power-factor-correction (PFC) rectifier is that too many analog-to-digital converters (ADCs) are used, and hence the corresponding cost is high. Hence, in this paper, the information on the required signal is obtained via two paired sawtoothed waves compared with the sensed signal, without any ADC used. For the PFC rectifier operating...
In this paper, we present a practical comparison on a range of circuit topologies suitable for passive LED drivers. These circuits consist of passive components and do not require any semiconductor controlled switches, auxiliary power supply and control integrated circuits. The power loss components, the energy efficiency and the output current ripple are examined. These passive LED drivers are particularly...
This paper describes a patent-pending passive offline LED driver that has no semiconductor switches, electrolytic capacitors, auxiliary power supply and control board. It can provide a fairly smooth current from the ac mains to drive LED strings. The new circuit has the advantages of high input power factor, high energy efficiency and luminous efficacy, long lifetime, stable luminous output and high...
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