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2Xnm cross point cell array of 1S1R has been investigated using advanced process technologies which include 1) a spacer to protect a selector material, 2) a selector to reduce sneak current, and 3) a resistor to have proper amount of oxygen vacancies (Vo). With such technologies optimization, the excellent bipolar 1S1R switching characteristics with low sneak current (300nA), low power operation (30μA),...
In this paper, 5Xnm cross point cell array for the low power ReRAM operation was developed with 1S1R cell structure. Through the optimization of both TiOx/TaOx based-1R and NbO2 based-1S stacks with TiN based-electrode, the world's first and best bipolar switching characteristics with the lowest operation current (20∼50uA) and sneak current (∼1uA) level were acquired.
We designed and fabricated planar InGaAs Schottky barrier diode (SBD) array for terahertz (THz) imaging applications. We also characterized the performances of SBD array and successfully obtained THz images.
The parametric acoustic array can generate highly directional sound beam by taking advantage of the nonlinear effect in air. The directivity of the sound beam can be controlled by applying phased array techniques, which have been proven to be adequate both in theory and experiment. However, significant mismatches are observed between the theoretical beampatterns and the measured directivities due...
In order to realize the high density array device and suppress the disturbance between the cells, ReRAM also seem to need a selective device same as a diode in PCRAM. Still, while appropriate bipolar selective device doesn't show up, the tunnel barrier oxide embedded in ReRAM stack is one of the promising candidates for selective device of bipolar resistive switching memory. Additionally, using a...
For the first time, very fast (10ns at even Reset) and high reliable (150°C 100h) ReRAM memory was demonstrated at 54 nm 256k bits array. Reset current successfully decreased up to 20uA using Al2O3 which acts as a tunnel barrier and filament source in TiO2/Al2O3 stack. From statistical analysis, the possibility of increasing array size and the key factor of resistance distribution were investigated.
The output power from renewable energy sources fluctuates because of weather variations. This paper proposes an effective power quality control strategy of renewable energy sources connected to power system using photovoltaic (PV) array and supercapacitor. A supercapacitor is connected to the DC bus of PV power generation system for power quality control of the grid-connected renewable energy sources...
An effective POS (photovoltaic output sensorless) MPPT (maximum power point tracking) control method for PV (Photovoltaic) power generation system is proposed in this paper. A fuzzy logic based algorithm, which has a simple feedback structure and fewer measured parameters, is proposed and applied to the control strategy of a DC/DC converter for effective realization of MPPT (maximum power point tracking)...
The DORT (decomposition de lpsilaoperateur de retournement temporel) method is an efficient technique to focus signal on the target. The DORT method requires the measurement of the inter-element impulse responses of the propagating medium for all pairs of elements in the array. The time reversal operator (TRO) is deduced and diagonalized from these responses. But DORT method has worse results in non-ideally...
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