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An error-function analytical expression describing compositional grading in a 850 nm AlGaAs/GaAs top-emitting oxide confined vertical cavity surface emitting laser has been derived. Results are presented showing that the optical properties of the considered device utilizing the proposed error-function compositional scheme are superior over other grading schemes found in the literature. The advantages...
Epileptic seizures reflect runaway excitation that severely hinders normal brain functions. With EEG recordings reflecting real-time brain activity, it is essential to both predict seizures and improve the classification of seizures in EEG signs. Towards this aim, nonlinear tools are strongly recommended to select the seizure-sensitive features prior to classification. However, the choice of the feature...
An almost rail-to-rail full clock fully differential rectifier and sample-and-hold amplifier is presented. It is based on a class AB fully differential two stage amplifier. It uses the miller compensation capacitor to hold the output and a duplicate of the output stage to ensure offset cancellation and proper common mode control. Simulation results, in 0.35 μm CMOS technology, show power consumption...
Most question and answer systems??Q&A?? are based on three research themes: question classification and analysis, document retrieval and answer extraction. The performance in every stage affects the final result. The classification of questions appears as an important task because it deduces the type of expected answers. A method of improving the performance of question classification is presented,...
This paper proposes a new, effective, robust and reliable solar battery charging algorithm for the widely used batteries; NiCd, NiMH, Lead-Acid and Lithium-Ion. The algorithm has the ability to charge the battery in the outdoor conditions, when the power is variable, and terminate charging when the battery is fully charged. The algorithm has two modes of operation; current mode and voltage mode. It...
This paper presents the holographic fabrication of three-dimensional photonic crystal templates by forming a five beam interference pattern using a top-cut prism. The interconnecting of the multi-layer structures was controlled by phase-tuning one interfering beam.
In this paper, we report a new design and fabrication of an integrated two-layer phase mask for five-beam holographic fabrication of three-dimensional photonic crystal templates.
A low-power low-voltage rectification and sample-and-hold circuit is presented. The circuit is based on transistors operating on weak inversion using a procedure developed in this paper. The proposed circuit can be programmed to function as sample-and-hold only or rectification and sample-and-hold. The design has been simulated with the CMOS 0.35 ??m, 3.3 V technology. For a power supply voltage of...
A 10 MHz, low-power, high-accuracy fully- differential always-valid sample-and-hold (AVSH) circuit is described. The circuit is based on the high dc gain Miller compensation operational amplifier. Its low- power make it suitable for biomedical application such that implantable smart medical devices (SMDs). The proposed circuit has been designed with CMOS 0.13 mum technology. The simulation shows that...
In this paper, we describe the simulation and measurement results of a fully integrated low-voltage CMOS rectification and bin-integration (RBI) module based on switched-capacitor and dedicated to nerve signal (Electroneurogram) acquisition and processing. RBI is the most common signal processing function applied to the nerve signals and since the frequency of these signals is relatively low, switched-capacitor...
Rapid thermal nitridation and reoxidation of thin films of SiO2 can significantly reduce the generation of electron traps during high field injection and enhance the charge to breakdown. This improvement is particularly relevant for the fabrication of EEPROMs with a high endurance. Our study is an attempt to explain these observations by correlating the influence of technological parameters on charge...
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