The continuing trend toward greater electrification and control of functions in consumer, commercial, industrial, transportation, and even medical applications promises a dynamic and increasingly important role for po...
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The continuing trend toward greater electrification and control of functions in consumer, commercial, industrial, transportation, and even medical applications promises a dynamic and increasingly important role for power electronics. The growing penetration of power electronics in energy systems is driven by new materials such as SiC and GaN, as well as new packaging technologies which allow the physical integration of electronics with powered and controlled devices such as motors. Advances in very high-frequency conversion led by the application of SiC and GaN devices promises to make converter-on-a-chip technology possible, but concurrent advances in passive component technology are necessary. The principal challenge to application penetration remains cost reduction.
Over the next decade, significant progress must be made in research on computer architectures that enable unprecedented improvements in the efficiency of large-scale computing systems, particularly to support applicat...
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Over the next decade, significant progress must be made in research on computer architectures that enable unprecedented improvements in the efficiency of large-scale computing systems, particularly to support applications that require exascale algorithmic performance. Here, we review the performance requirements for both high-performance computing systems and data centers, and show that it will be critical to exploit photonic devices for interconnect applications to meet these expectations. In the long term, CMOS-compatible fabrication technologies promise a "Moore's Law for photonics" that could completely change the economics of integrated optics and high-performance computing for defense, security, scientific, and consumer applications.
The ieee International Solid-State circuits Conference (ISSCC) is the foremost global forum for presenting advances in solid-state circuits and systems-on-a-chip. Every year since its first issue, the ieeejournal OF ...
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The ieee International Solid-State circuits Conference (ISSCC) is the foremost global forum for presenting advances in solid-state circuits and systems-on-a-chip. Every year since its first issue, the ieeejournal OF SOLID-STATE circuits has highlighted some well-received papers from the most recent ISSCC in special issues. This special issue covers the ISSCC conference held in San Francisco, CA, February 19-23, 2012. Session chairs and co-chairs initially recommended papers for publication, with final decision for inclusion based on peer review. This January issue includes the topics from the low power and high performance digital, memory, technology directions as well as imagers, medical and sensors. Five innovative papers were selected from the Energy Efficient Digital sessions of the ISSCC 2012 for this special issue. Two of the papers describe ultra-low-power processors. There are also two energy efficient special function SoC papers: an object recognition processor and a 60 GHz transceiver. The last paper describes an enhancement of the razor technique.
Microcontrollers play a vital role in embodying intelligence into battery-powered everyday objects to realize the internet of things (IoT). The desirable attributes of such a microcontroller and the like include high ...
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Microcontrollers play a vital role in embodying intelligence into battery-powered everyday objects to realize the internet of things (IoT). The desirable attributes of such a microcontroller and the like include high energy and area efficiency, and robust error-free operation under dynamic voltage scaling (DVS), workload, process, voltage, and temperature (PVT) variation effects. In this work, a synchronous-logic and a quasi-delay-insensitive asynchronous-logic 8051 microcontroller core are designed and fabricated for full-range DVS from nominal to deep sub-threshold. The performance of the and are largely comparable at nominal conditions and the entire DVS range, but differs when PVT and workload are varied. At nominal, both the microcontroller cores feature comparable energy and speed, with the electromagnetic interference of the lower and the area larger than the. When DVS is applied, both the microcontroller cores feature comparable energy and speed;the requires simultaneous adjustment of clock frequency with. At wide PVT variations, up to delay margins are required for the, whereas the operates at actual speed. When the workload of both microcontrollers is varied, the features lower energy dissipation per workload due to the exploitation of its asynchronous-logic protocols. For IoT applications that incur wide PVT and workload variations, is more suitable due to its self-timed nature, whereas when PVT and workload variations are less severe, is more suitable due to a smaller IC area.
Space-time spectral white spaces in a cognitive radio environment are defined based on multidimensional spatio-temporal spectral properties of radio waves received by a planar array of antennas. Spectral occupancy of ...
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Space-time spectral white spaces in a cognitive radio environment are defined based on multidimensional spatio-temporal spectral properties of radio waves received by a planar array of antennas. Spectral occupancy of a given carrier frequency pertaining to a particular direction in space is expressed by the volume of a semi-cone shaped geometrical region in the 3-D spatio-temporal frequency space omega. A combined approach employing low complexity array processing and conventional time-frequency spectrum sensing is proposed towards the detection of space-time white spaces in omega. The detection scheme employs four subsystems;antenna array, front-end processing, 3-D spatio-temporal array processing, and 1-D spectrum sensing. Key components in the antenna array and front-end processing subsystems are described including an example of a broadband Vivaldi antenna simulated in the frequency range 1.25-2 GHz. The array processing subsystem employs 3-D infinite impulse response digital beam filters, as a low complexity alternative to conventional phased arrays. One potential realization of the 1-D spectrum sensing subsystem is described by using a tunable bandpass filter followed by an energy detector. Simulation examples are provided by considering different directions of arrival, effect of multi-path replicas, signal to noise ratio changes and both narrow band and wideband signals in the normalized temporal frequency range (0, pi).
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