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91 results on '"Yamaguchi, Yo"'

4. A 24–30-GHz 256-Element Dual-Polarized 5G Phased Array Using Fast On-Chip Beam Calculators and Magnetoelectric Dipole Antennas

Author

Sadhu, Bodhisatwa, primary, Paidimarri, Arun, additional, Liu, Duixian, additional, Yeck, Mark, additional, Ozdag, Caglar, additional, Tojo, Yujiro, additional, Lee, Wooram, additional, Gu, Kevin Xiaoxiong, additional, Plouchart, Jean-Olivier, additional, Baks, Christian W., additional, Uemichi, Yusuke, additional, Chakraborty, Sudipto, additional, Yamaguchi, Yo, additional, Guan, Ning, additional, and Valdes-Garcia, Alberto, additional

Published
2022
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8. A 24-to-30GHz 256-Element Dual-Polarized 5G Phased Array with Fast Beam-Switching Support for >30,000 Beams

Author

Sadhu, Bodhisatwa, primary, Paidimarri, Arun, additional, Lee, Wooram, additional, Yeck, Mark, additional, Ozdag, Caglar, additional, Tojo, Yujiro, additional, Plouchart, Jean-Olivier, additional, Gu, Xiaoxiong, additional, Uemichi, Yusuke, additional, Chakraborty, Sudipto, additional, Yamaguchi, Yo, additional, Guan, Ning, additional, and Valdes-Garcia, Alberto, additional

Published
2022
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10. Changes in the Hepatic Expression of Three Vitellogenin Subtype Genes During Ovarian Development in Female White-Edged Rockfish (Sebastes taczanowskii)

Author

Nagata, Jun, primary, Wada, Satoru, additional, Nishimiya, Osamu, additional, Wu, Meiqin, additional, Mushirobira, Yuji, additional, Yamaguchi, Yo, additional, Yokono, Takanori, additional, Kawasaki, Takuma, additional, Matsubara, Takahiro, additional, Todo, Takashi, additional, Hara, Akihiko, additional, and Hiramatsu, Naoshi, additional

Published
2021
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13. A non-binary direct digital synthesizer with an extended phase accumulator

Author

Nosaka, Hideyuki, Yamaguchi, Yo, and Muraguchi, Masahiro

Subjects
Frequency synthesizers -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Research describing a direct digital synthesizer with flexibly controlled output tuning is presented. By incorporating an extended phase accumulator the problem of signal jitter can be overcome.

Published
2001

14. Wide-band SSB subharmonically pumped mixer MMIC

Author

Okazaki, Hiroshi and Yamaguchi, Yo

Subjects
Microwave integrated circuits -- Research, Mixers (Electronics) -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

To achieve low conversion-loss and high image-rejection performance in the wide band for up and down conversion, an SSB subharmonically pumped mixer using an inphase RF divider/combiner is proposed. The SSB mixer monolithic microwave integrated circuit (MMIC) is integrated in a small area of 1.8 x 1.3 [mm.sup.2] and shows good performance at 21.6 to 30.8 GHz. Index Terms - Image-rejection mixer, monolithic microwave integrated circuit (MMIC), quasi-lumped stub, subharmonically pumped mixer, wide-band mixer.

Published
1997

15. An L-band ultra-low-power-consumption monolithic low-noise amplifier

Author

Nakatsugawa, Masashi, Yamaguchi, Yo, and Muraguchi, Masahiro

Subjects
Microwave amplifiers -- Design and construction, Microwave integrated circuits -- Usage, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A low-power-consumption variable-gain low-noise amplifier (LNA) is demonstrated. To achieve low noise, low distortion, and low power consumption simultaneously, a cas-code connection between an enhancement-mode GaAs MES-FET (EFET) and a depletion-mode GaAs MESFET (DFET) is employed. The EFET is superior to the DEFT in its gain and noise figure performance while the DFET offers good intermodulation distortion performance. The advantages of both types of FET's are combined in the developed LNA. It shows excellent performance with an NF of 2.0 dB, a gain of 12.2 dB, and an I[P.sub.3] of 5.1 dBm at 1.9 GHz. The demonstrated performance satisfies the specifications of the Japanese Personal Handy phone System even at the ultra-low power consumption of 2.0 mW.

Published
1995

37. Improved technique for reflection performances in broadband variable gain low noise amplifiers

Author

Kawashima, Munenari, Nakagawa, Tadao, Yamaguchi, Yo, and Araki, Katsuhiko

Subjects
ING-INF/01 Elettronica
Abstract

We propose an improved technique for reflection performances in broadband variable gain low noise amplifiers that does not require preamplifiers and buffer amplifiers. This technique controls the feedback circuit and main amplifier simultaneously to obtain constant input and output impedance values. When the amplifier’s gain changed, the reflection performance remained good. Amplifiers ranging from 750 MHz to 6 GHz fabricated using this technique showed an |S22| of less than -10 dB, a |S11| of less than -8 dB, and a variable gain range of more than 33 dB @ 2 GHz. Compared with conventional techniques, the |S22| showed a 6 dB improvement, the |S11|showed a 3 dB improvement, and the variable gain range showed an 8 dB improvement.

Published
2005
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