Current Issue : July - September Volume : 2020 Issue Number : 3 Articles : 5 Articles
LEDs are highly energy efficient and have substantially longer lifetimes compared to other\nexisting lighting technologies. In order to facilitate the new generation of LED devices, approaches to\nimprove power efficiency with increased integration level for lighting device should be analysed.\nThis paper proposes a fully on-chip integrated LED driver design implemented using heterogeneous\nintegration of gallium nitride (GaN) devices atop BCD circuits. The performance of the proposed\ndesign is then compared with the conventional fully on-board integration of power devices with the\nLED driver integrated circuit (IC). The experimental results confirm that the fully on-chip integrated\nLED driver achieves a consistently higher power efficiency value compared with the fully on-board\ndesign within the input voltage range of 4.5â??5.5 V. The maximal percentage improvement in the\nefficiency of the on-chip solution compared with the on-board solution is 18%....
Signal drift caused by sensors or environmental changes, which can be regarded as data\ndistribution changes over time, is related to transductive transfer learning, and the data in the target\ndomain is not labeled. We propose a method that learns a subspace with maximum independence of\nthe concentration features (MICF) according to the Hilbert-Schmidt Independence Criterion (HSIC),\nwhich reduces the inter-concentration discrepancy of distributions. Then, we use Iterative Fisher\nLinear Discriminant (IFLD) to extract the signal features by reducing the divergence within classes\nand increasing the divergence among classes, which helps to prevent inconsistent ratios of different\ntypes of samples among the domains. The effectiveness of MICF and IFLD was verified by three\nsets of experiments using sensors in real world conditions, along with experiments conducted in the\nauthorsâ?? laboratory. The proposed method achieved an accuracy of 76.17%, which was better than\nany of the existing methods that publish their data on a publicly available dataset (the Gas Sensor\nDrift Dataset). It was found that the MICF-IFLD was simple and effective, reduced interferences,\nand deftly managed tasks of transfer classification....
This paper presents the analysis and design of the harmonic rejection (HR) low-noise\namplifier (LNA) with the fully passive source degeneration notch filter....................
In this paper, we demonstrate a compact 20-W GaN internally matched power amplifier\nfor 2.5 to 6 GHz jammer systems which uses a high dielectric constant substrate, single-layer\ncapacitors, and shunt/series resistors for low-Q matching and low-frequency stabilization..................
This manuscript introduces two new chaotic oscillators based on autonomous Boolean\nnetworks (ABN), preserving asymmetrical logic functions. That means that the ABNs require\na combination of XOR-XNOR logic functions. We demonstrate analytically that the two ABNs\ndo not have fixed points, and therefore, can evolve to Boolean chaos. Using the Lyapunov\nexponentâ??s method, we also prove the chaotic behavior, generated by the proposed chaotic oscillators,\nis insensitive to incommensurate time-delays paths. As a result, they can be implemented using\ndistinct electronic circuits. More specifically, logic-gatesâ??, GALâ??, and FPGAâ??based implementations\nverify the theoretical findings. An integrated circuit using a CMOS 180nm fabrication technology is\nalso presented to get a compact chaos oscillator with relatively high-frequency. Dynamical behaviors\nof those implementations are analyzed using time-series, time-lag embedded attractors, frequency\nspectra, Poincare maps, and Lyapunov exponents....
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