Abstract
PAGE 711 Researchers from China provide an experimental study of recovery time in a bulk gallium arsenide (GaAs) avalanche semiconductor switch. The switch, operating in a low energy-triggered mode, was found to have a recovery time reduction when its biased voltage was reduced. PAGE 705 Phillips Photonics researchers from both Germany and the Netherlands have produced a compact optically pumped vertical external-cavity surface-emitting laser (OP-VECSEL) which, consisting of an optically pumped semiconductor switch and surrounded by VCSEL chips mounted on a single heat sink, allows it to reach 10 Watts of power. External view of bulk avalanche semiconductor. PAGE 688 Conventional mobile devices have thermal management problems primarily managed with software-based techniques due to the need for compact size inhibited hardware solutions. Since software-based solutions inevitably inhibit device performance a team from Korea has developed a control algorithm which adaptively controls threshold performance based on CPU power efficiency in real time. Drawing scheme of VECSEL with compact design. PAGE 701 A pair of researchers from China present a multi-order bandpass filter based on unit cells. The fabricated filter features an ultra-wide stopband and impressive stopband rejection performance as confirmed by experimental results. The easily-tunable BPF topology is suitable for a variety of applications in microwave communication systems. Power consumption measurements. PAGE 707 An active clamping circuit for voltage-sharing among series-connected insulated gate bipolar translators during the turning-on process has been presented by a team of researchers in China. The design includes a time detection circuit to detect the pulse signal indicating the working time of the active clamping circuit for driving signal regulation. Bandpass filter unit cell. Proposed active clamping circuit for turning-on process.
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