Kentaro Honda

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Energy harvesting is an enabling technology for realizing an ambient power supply for wireless sensor nodes and mobile devices. By using flexible photovolta-ic cells and piezoelectric films, we can readily harvest ambient energy if flexible energy harvesters can be realized. Conventional silicon circuits, however, are not best suited to realizing flexible(More)
—This paper presents a 95 mV startup-voltage step-up DC-DC converter for energy harvesting applications. The capac-itor pass-on scheme enables operation of the system from an input voltage of 95 mV without using additional off-chip components. To compensate for the die-to-die process variation, post-fabrication threshold voltage trimming is applied to(More)
—A 100-V ac energy meter based on the system-on-a-film (SoF) concept, in which various devices are integrated on a flexible film, is presented. The system consists of 20-V organic CMOS digital and analog circuits with a floating gate (FG) for process variation compensation, 100-V organic pMOS rectifiers for generating a 50-Hz clock and 20-V dc power, and an(More)
—A shoe insole pedometer, which consists of a piezo-electric energy harvester and a 2 V organic pedometer circuit, has been developed as a first step toward the application of flexible large-area energy harvesting. A pseudo-CMOS 14 bit step counter records the number of steps up to 16383 steps using the harvested power. To increase the noise margin of the(More)
— In order to reduce minimum operating voltage (V DDmin) of CMOS logic circuits, a new method reducing the within-die random threshold (V TH) variation of transistors by a post-fabrication automatically selective charge injection using substrate hot electrons (SHE) is proposed along with novel circuitry to utilize this. In the new circuit, switches are(More)