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The visible light communications that communicates by modulating the light of illumination, which is the existing infrastructure, attracts attention. So as to improve the speed, to increase the bandwidth, and to miniaturize hardware of this communication system, improvement in the transmission speed by a single LED for lighting is important. The transmission speed of an LED is greatly restricted by...
Design of an energy efficient wavelength division multiplexing (WDM) transponder is proposed and demonstrated. The WDM transponder interworking with the link-aggregation (LAG) technique possessed by a layer 2 switch (L2SW) can achieve power saving depending on traffic variations by utilizing an adaptive interface control.
Recent operating systems are capable of using dynamic loadable module functions to update the device driver programs without shutting down the entire system. However, even if a system continues to operate, some services provided by the device driver will be temporarily unavailable during the run-time update. To reduce the period during which the services are unavailable, we propose a new method for...
Sampling periods in digital control systems have been shortened thanks to the development of both hardware and software technologies. In recent years, FPGA (Field Programmable Gate Array) has been applied to robot systems to achieve hard real-time system with short sampling periods. Due to the short sampling periods, the effect of the time quantization has been reduced. Some other hardware restrictions,...
The authors present two developments for DRAM voltage limiters: a precise internal-voltage generator composed of a PMOS threshold-voltage-difference generator and a tunable voltage-up converter with fuse trimming; and a stabilized driver composed of a feedback amplifier with compensation for a time-dependent load. These circuits provide a voltage not susceptible to the supply-voltage and substrate-voltage...
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