Kengo Nakata

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This paper presents a 56Gb/s 16-QAM 65nm CMOS transceiver using a W-band carrier. Two wideband IF signals are up- and downconverted simultaneously with 68GHz and 102GHz carriers. The transceiver achieves 56Gb/s data-rate with TX-to-RX EVM of -16.5dB within 0.1m distance. The transceiver consumes 260mW and 300mW from a 1V supply in TX and RX modes,(More)
A fractional-N sub-sampling PLL architecture based on pipelined phase-interpolator and Digital-to-TimeConverter (DTC) is presented in this paper. The combination of pipelined phase-interpolator and DTC enables efficient design of the multi-phase generation mechanism required for the fractional operation. This technique can be used for designing a(More)
This paper presents a 27.5-29.6GHz fractional-N frequency synthesizer using reference and frequency doublers to achieve low in-band and out-of-band phase-noise for 5G mobile communications. The push-push amplifier and 28GHz balun help achieving differential signals with low out-of-band phase noise while consuming low power. A charge pump with gated offset(More)
The infectivity of a Japanese isolate of tomato powdery mildew, Oidium neolycopersici KTP-01, to tomato cultivars was examined using a resistant cultivar Grace bred in The Netherlands to O. lycopersici, which was recently proposed to be renamed O. neolycopersici. Grace was severely infected with KTP-01, and its susceptibility was similar to that on(More)
 A single conidium of tomato powdery mildew was isolated from heavily infected leaves of tomato (cv. Moneymaker) grown in the greenhouse of Kinki University, Nara Prefecture, Japan. It was successively multiplied so the morphological and taxonomic characteristics of the pathogen and its host range under high humidity conditions could be analyzed. The(More)
Leaves of tomato and barley were inoculated with conidia of Blumeria graminis f. sp. hordei race 1 (R1) or Oidium neolycopersici (KTP-01) to observe cytological responses in search of resistance to powdery mildew. Both conidia formed appressoria at similar rates on tomato or barley leaves, indicating that no resistance was expressed during the(More)
An antifungal metabolite, oosporein, was isolated from the culture of Verticillium psalliotae that produced the antagonistic effects on Phytophthora infestans. Oosporein exhibited a significant growth-inhibitory effect on P. infestans in comparison with other phytopathogenic fungi.
Phase-locked loops (PLLs) are a crucial building block in modern Systems-onChip (SoCs), which contain microprocessors, I/O interfaces, memories, power management, and communication systems. Fully synthesizable PLLs [1-2], designed using a pure digital design flow, have been proposed to reduce the design cost and allow easier integration. To achieve(More)