Tatsuhiro Shimura

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This paper proposes a new architecture for envelope-tracking power supplies for base stations. The proposed multiphase DC-DC converter circuit uses multiple switching circuits (as well as a voltage follower circuit), each optimized for a different envelope frequency, to realize both high efficiency and wide bandwidth. The operation of the circuit, and(More)
An ultra-small, low-power sensor-net module called ZN1 is developed. ZN1 integrates MCU, ZigBee RF into an ultra-small 15times15-mm module with an ultra-low standby current less than 1 muA. The and highly reliable operation for more than 15 years of the ZN1 enable low-cost practical application-specific sensor nodes for HVAC, structure monitoring, office(More)
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