In this study, the authors propose the use of distributed elements interconnected with switches to construct a reconfigurable matching network (RMN). Several RMNs are constructed using tunable lumped elements. However...
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In this study, the authors propose the use of distributed elements interconnected with switches to construct a reconfigurable matching network (RMN). Several RMNs are constructed using tunable lumped elements. However, this technique increases the system complexity because of the use of digital-to-analogue converters and synthesis algorithms. In this study, the proposed RMN employs a non-uniform transmission line with adjustable characteristic impedances, which are controlled by opening or closing the switches. While previous studies on non-uniform transmission lines have aimed to investigate the fixed configurations, this topology is designed to be an RMN that satisfies the design challenges. The maximum dimension is 0.2 times the guided wavelength of the low operational frequency, and five switches are used;however, the matchable impedances cover an extensive range of the Smith chart, and the RMN successfully tunes inherently unmatched antennas to operate at a target frequency band that depicts a fractional bandwidth of 60%. Additionally, the evaluated results depict that the fabricated RMN illustrates low insertion loss and high transducer gain and that it achieves both antenna-mismatch compensation and antenna-bandwidth extension.
Network on Chip (NoC) architectures have emerged in recent years as scalable communication fabrics to enable high bandwidth data transfers in chip multiprocessors (CMPs). These interconnection architectures still need...
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Network on Chip (NoC) architectures have emerged in recent years as scalable communication fabrics to enable high bandwidth data transfers in chip multiprocessors (CMPs). These interconnection architectures still need to conquer many challenges, e.g., significant power consumption and high data transfer latencies. Hybrid electro-photonic NoCs have been recently proposed as a solution to mitigate some of these challenges. However, with increasing application complexity, hardware dependencies, and performance variability, optimization of hybrid photonic NoCs requires traversing a massive design space. To date, prior work on software tools for rapid automated NoC synthesis have mainly focused on electrical NoCs. In this article, we propose a novel suite of software tools for effectively synthesizing hybrid photonic NoCs. We formulate and solve the synthesis problem using four search-based optimization heuristics: (1) Ant Colony Optimization (ACO);(2) Particle Swarm Optimization (PSO);(3) Genetic Algorithm (GA);and (4) Simulated Annealing (SA). Our experimental results show significant promise for the ACO and PSO based heuristics. Our novel implementation of PSO achieves an average of 64% energy-delay product improvements over GA and 53% improvement over SA;while our novel ACO implementation achieves 107% energy-delay product improvements over GA and 62% improvement over SA.
The area of Field Programmable Gate array (FPGA) design is evolving at a rapid pace. Advancements in the complexity of the FPGA's architecture mean that now it can be used in far more applications than before. Thi...
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ISBN:
(纸本)9780780394292
The area of Field Programmable Gate array (FPGA) design is evolving at a rapid pace. Advancements in the complexity of the FPGA's architecture mean that now it can be used in far more applications than before. This paper presents synthesis process, synthesis algorithm requirements and various other design improvements which in a true sense enhance the digital system performance with respect to area and delay trade offs. It. also covers a number of timing issues that are important in basic digital system design. The issues are normally observed while working with Xilinx FPGAs. Some established techniques are reviewed relative to these criteria to understand their applicability, and the potential for further research in these specialized areas.
The notion of program sensitivity (aka Lipschitz continuity) specifies that changes in the program input result in proportional changes to the program output. For probabilistic programs the notion is naturally extende...
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