Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Takanobu Fujiwara"'
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 68:4091-4102
We have proposed a vector-sum phase shifter (VSPS) with a low phase shift error using a tunable active $g_{m}{\text {-}}{C}$ polyphase filter (PPF). The proposed VSPS realizes high insertion gain and a low phase shift error because the tunable active
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ffe35fb96f0bf767e2d1cad8427eb7ef
https://doi.org/10.1109/tmtt.2020.2991738
https://doi.org/10.1109/tmtt.2020.2991738
Publikováno v:
2019 49th European Microwave Conference (EuMC).
We developed a V-band vector-sum phase shifter with frequency mixing. The developed phase shifter consists of two VGAs (Variable Gain Amplifiers) deployed in an IF path, a QMIX (Quadrature-Mixer) which combines output signals of the VGAs in a RF path
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40add288a7fa9ba5528d492cd947b4f3
https://doi.org/10.23919/eumc.2019.8910830
https://doi.org/10.23919/eumc.2019.8910830
Autor:
Mitsuhiro Shimozawa, Takanobu Fujiwara
Publikováno v:
2018 13th European Microwave Integrated Circuits Conference (EuMIC).
In recent years, for the realization of the low-cost and multi-band AP AA (Active Phased Array Antenna) system, broadband and highly accurate vector-sum phase shifter has attracted the attention. To realize such a vector-sum phase shifter, one of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c4d526149cbf5d6656551d4fc1d2751
https://doi.org/10.23919/eumic.2018.8539953
https://doi.org/10.23919/eumic.2018.8539953
Autor:
Shintaro Shinjo, Tapio Kolmonen, Sandro Lanfranco, Peter M. Asbeck, Takanobu Fujiwara, Olli Piirainen, Shuichi Sakata
Publikováno v:
2017 IEEE MTT-S International Microwave Symposium (IMS).
We report a high efficiency multi-band Envelope-Tracking Power Amplifier (ET-PA) that supports modulation bandwidth up to 80MHz using real-time digital predistortion (RT-DPD). The ET-PA consists of a broadband RF-PA and a singlephase buck-converter.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b87d849b031a7dc1372eb02d4918a6ef
https://doi.org/10.1109/mwsym.2017.8059016
https://doi.org/10.1109/mwsym.2017.8059016
Autor:
Shintaro Shinjo, Hideyuki Nakamizo, Ryota Komaru, Koji Yamanaka, Shuichi Sakata, Jun Kamioka, Takanobu Fujiwara, Keigo Nakatani
Publikováno v:
VLSI-DAT
In order to realize a massive MIMO concept, small size and low power consumption over the wide-band frequency range are challenges for RF frontends module. This paper describes a highly integrated RF frontend module for high SHF wide-band massive MIM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bd622735bf52dd5eeb91ea6db087228
https://doi.org/10.1109/vlsi-dat.2017.7939651
https://doi.org/10.1109/vlsi-dat.2017.7939651
Autor:
Jonmei J. Yan, Kenji Mukai, Hamed Gheidi, Takanobu Fujiwara, Hideyuki Nakamizo, Shintaro Shinjo, Peter M. Asbeck
Publikováno v:
2016 11th European Microwave Integrated Circuits Conference (EuMIC).
We report a multiband Envelope-Tracking (ET) Power Amplifier (PA), comprising a very broadband RF-PA stage and a Voltage-Mode class-D (VMCD) buck-converter with 200MHz switching frequency. Both buck-converter and RF-PA were fabricated using a GaN HEM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adaf12489910fd70847aadeed87c67bf
https://doi.org/10.1109/eumic.2016.7777506
https://doi.org/10.1109/eumic.2016.7777506