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Communication technologies are very important for disaster management. Satellite network's advantage of large coverage and Mobile Ad hoc Network's (MANET) advantage of high flexibility could be ideal for disaster management. In this paper, the authors propose a novel scheme for providing reliable wireless communications in disaster sites with a hybrid network of terrestrial MANET and satellite network...
This paper presents a fully integrated class-E power amplifier IC with body effect to achieve high efficiency and high gain at low supply voltage for 2.5-GHz band short range wireless communication systems. The class-E amplifier IC is designed, fabricated and fully evaluated in 180-nm CMOS. The proposed power amplifier IC exhibits a small-signal gain of 10.8 dB and a saturated output power of 10.8...
Insulated Gate Bipolar Transistors (IGBTs) have become increasingly important in modern high power systems. Due to limits in silicon properties and processing technologies, the blocking voltage of a single power device is usually limited compared to the typical grid systems operating voltage. To support a higher DC link voltage, power devices such as IGBTs can be connected in series. However, because...
A fully integrated class-E power amplifier IC in 180-nm CMOS is presented for 2.5-GHz band short range wireless communication systems. To realize high efficiency with low operation voltage, a class-E amplifier with back gate effect has been designed, fabricated and fully evaluated. The proposed amplifier IC can operate at a supply voltage from 0.5 V to 1.5 V. The amplifier IC exhibits a P1dB of 6...
This paper presents an ultra-wideband and ultra-low-voltage compact power detector IC for microwave and millimeter-wave applications. The power detector circuit includes an nMOSFET differential pair with resistive feedback and a pMOSFET buffer. The power detector IC was designed, fabricated and fully evaluated using Fujitsu 65-nm CMOS technology. The detector IC exhibits an operation frequency from...
Active Voltage Control (AVC) is an implementation of classic Proportional-Derivative (PD) control and multi-loop feedback control to force an IGBT to follow a pre-set switching trajectory. Previously, AVC was mainly used for controlling series-connected IGBTs in order to enable voltage balance between IGBTs. In this paper, the nonlinear IGBT turn-off transient is further discussed and the turnoff...
High-performance power switching devices (IGBT/MOSFET) realise high-performance power converters. Unfortunately, with a high switching speed of the IGBT or MOSFET — freewheel diode chopper cell, the circuit has intrinsic sources of high-level EMI. Therefore, costly EMI filters or shielding are normally demanded on the load and supply side. Although an "S-shaped" voltage transient with a...
IGBTs realise high-performance power converters. Unfortunately, with fast switching of the IGBT-free wheel diode chopper cell, such circuits are intrinsic sources of high-level EMI. Therefore, costly EMI filters or shielding are normally needed on the load and supply side. In order to design these EMI suppression components, designers need to predict the EMI level with reasonable accuracy for a given...
This paper presents a low operation voltage ultrawideband power detector IC for microwave and millimeter-wave applications. The power detector circuit includes an nMOS transistor differential pair with a resistive feedback. The power detector IC was designed and fabricated using TSMC 130 nm CMOS technology. The detector IC exhibits an operation frequency from 100 MHz to 40 GHz at an operation voltage...
The NAC (network access control) technology which enforces the endpoint access decision based on the collected endpoint security status information and platform measurement information has been developed by various companies and has been widely deployed in intranets. Besides intranet, mobile telecommunication networks also find NAC is required. This paper introduces the main NAC solutions in industry...
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