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A CMOS receiver for optical wireless communication is presented. A stable feedback transimpedance amplifier (TIA) is designed adopting a current-mode amplifier as its feedforward gain element. A band-pass limiting amplifier is employed to boost the outputs of the receiver front-end. Implemented in a 0.35 um CMOS, the optical wireless receiver achieves a maximum transimpedance gain of 95.9 dBΩ. The...
We give an overview of recent results on slow and fast light in active semiconductor waveguides. The cases of coherent population oscillations as well as electromagnetically induced transparency are covered, emphasizing the physics and fundamental limitations.
To recognize and understand a person's emotion has been known as one of the most important issue in human-computer interaction. In this paper, we present a multimodal system that supports emotion recognition from both visual and acoustic feature analysis. Our main achievement is that with this bimodal method, we can effectively extend the recognized emotion categories compared to when only visual...
Routing in mobile ad hoc networks remains as a challenging problem given the limited wireless bandwidth, users' mobility and potentially large scale. Recently, there has been a thrust of research to address these problems, including on-demand routing, geographical routing, virtual coordinates, etc. In this paper, we focus on geographical routing, which was shown to achieve good scalability without...
Previous attempts at fabricating a symmetrical six-port microstrip coupler yielded a bandwidth of only 25%. Measurement tests on a new prototype have confirmed that the design improvements proposed in the present paper are able to increase the coupler's bandwidth to 41%
As power electronic applications continue to switch higher levels of voltage and current in smaller-sized component packages, the resulting increase in power density requires efficient thermal management. This paper compares the thermal performance for operating a MOSFET on a water-cooled pole-arrayed heat sink versus a novel water-cooled microchannel heat sink
Zinc oxide (ZnO) and its ternary alloy magnesium zinc oxide (Mg xZn1-xO) are piezoelectric materials for high quality factor bulk acoustic wave (BAW) resonators operating at GHz frequencies. MgxZn1-xO thin film BAW devices built on Si substrates are particularly attractive for integrating piezoelectric MgxZn1-xO with the main stream semiconductor devices and circuits. In this paper, we report single-mode...
In this paper, we experimentally explored high energy and high peak power pulse generation in very large core multimode fiber amplifiers, achieving the highest ever reported energies of up to 82-mJ for 500-ns pulses, of up to 27-mJ for 50-ns pulses, and of up to 2.4-MW peak power for 4-ns long pulses at 1064 nm5. Fiber core sizes used in these studies ranged from 50-mum up to 200-mum, just above the...
Service-oriented computing (SOC) and Web services (WS) provide a flexible computing platform for electronic business and commerce. Introducing policy-based computing to service-oriented business systems adds another dimension of flexibility and security. While service composition and re-composition in service-oriented business systems allow major system reconstruction, policy-based computing can better...
In this paper, the failure modes of power module IGBTs have been experimentally studied by focusing on the short-circuit behaviour of the devices, with reference to the hard switching fault (HSF) and fault under load (FUL) types of fault. In particular, the current ringing phenomenon, having an important influence on the short circuit behaviour of the IGBTs, has been investigated by taking in account...
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