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An interesting about MAV and a research for flapping wing aero vehicle has been increased. It is required that take-off and landing abilities to lift up a vehicle by flapping motion to achieve a special purpose for flapping wing aero vehicle. An airfoil has to generate lift force more than a weight of the body to work take-off from the ground without additional force. MAV can generate enough lift...
A compact and low-power digital-domain noise coupling technique is proposed for higher-order CT DSM implementation, exploiting the architectural advantage of a SAR ADC and a simple digital filter. With an 8b SAR ADC and a second-order digital noise coupling filter, a prototype fourth-order DSM achieves 74.4dB SNDR for 10MHz BW with an OSR of 16 in a 28nm CMOS, showing an FoMs_dr of 174.5dB.
Exciton-polaritons are bosonic quasi-particles originating in the strong coupling regime. They can undergo a condensation process leading to coherent emission. We show a realisation of electrically driven polariton condensates using a p-i-n doped microcavity.
The era of Smart Work emerges as a means for enabling us to overcome spatial and temporal constraints. Smart Work means the work that individuals perform from a physical distances for their organizations in a flexible and innovative manner using mobile devices such as smartphones. Thanks to the Smart Work affordances with seamless access enabled by using mobile computing devices, organizations can...
Magnetic resonance wireless power link including a non-coaxially aligned repeater resonator has been analyzed and designed for efficient mid-range wireless powering. Parametric study on the power transfer efficiency (PTE) for several meter distance range indoor powering has been made and optimization condition for maximum PTE have been obtained. The results are expected to be utilized for mid-range...
A simple and easy magnetic coupling equalizer for a series-connected lithium-ion battery string is presented. The equalizer applies identical duty cycle to all active power switches without using the voltage sensing circuits and the secondary side components of multi-winding transformer. During the turn-on switching interval, the equalizer automatically transfers energy from the high-voltage battery...
The paper presents a high efficient charge equalizing circuit for series connected battery cells using the inductor voltage second balance and the transformer coupling principle. The proposed circuit is motivated from a general buck-boost converter with a multi-winding transformer coupling, and operates under zero voltage switching (ZVS) and zero current switching (ZCS) condition, which is achieved...
A 16-element phased array receiver with built-in-self test (BIST) is demonstrated at 76–84 GHz. The BIST technique employs a miniature capacitive coupler located at the input port of each phased-array channel, and uses the receiver I/Q down-converter to measure the amplitude and phase of each channel. This allows for measuring the response of individual channels if one channel is turned on at a time,...
This paper presents a QFN packaged phased-array RFIC for X-band applications. The transmit X-band phased array is differential except for baluns at the input and output ports. Electromagnetic simulation is done to result in low channel-to-channel coupling. Measurements show a wideband impedance match and a worst-case channel-to-channel coupling of < −29 dB at 8–10 GHz. The results show that...
For an efficient wireless charging to multiple devices, transmitter (TX) system should be able to control the transmitting power-level by monitoring number of receiver (RX) devices via their identification information and charging status and capacity of each receivers. This work proposes a one-way in-band communication scheme, corresponding system structure, and charging algorithm for efficient one-to-N...
An optical tapered microfiber is used to collect photoluminescence of semiconductor quantum dots in photonic crystals at cryogenic temperature (∼8K). Curved-microfiber coupled system dramatically enhances collection efficiency by several times.
System level ESD protection methodology for mobile display driver IC is discussed at the viewpoint of hard and soft failure caused by injected ESD charge into I/O pins from LCD panel. The key design factor was analyzed through device simulation, successfully implemented to IC and verified at system level ESD evaluation.
The increased fluidity and agility of organizations demand the smooth mediation of information technology (IT) between user and task. As rigid hierarchies are giving way to open, loosely-coupled, mobile ways for collaborative business, mobility enabled by IT tools has been proposed as potential capability that can provide new dimensions in such mediation. But, few studies have provided an integrative...
A K-band quadrature voltage-controlled oscillator (QVCO) based on asymmetric coupled transmission lines is presented. Asymmetric coupled transmission lines are used to couple two identical LC tank oscillators for generation of a quadarature signal with comparable phase noise with reported QVCOs at the frequencies. The fabricated QVCO using InGaP/GaAs HBT technology shows the oscillation frequencies...
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