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 Results 1 - 9 of 9  /   
Committee Date Time Place Paper Title / Authors Abstract Paper #
ICD, CPSY, CAS 2018-12-23
16:10		 Okinawa   Comparison between Quadrature-modulation EPWM transmitters with a 90° and 180° hybrid in physical models
Tomoaki Morita, Yohtraro Umeda (Tokyo Univ. of Science) CAS2018-115 ICD2018-99 CPSY2018-81		 Quadrature-modulation envelope-pulse-width-modulation (EPWM) transmitter with a 180° (180HYB system) or 90° hybrid (90HY... [more] CAS2018-115 ICD2018-99 CPSY2018-81
pp.153-158
MW 2018-12-13
15:45		 Kanagawa Kanagawa Univ. Implementation of quadrature-modulation Transmitter for Generating Bi-level EPWM Signal
Mizuki Kinoshita, Umeda Yohtaro (Tokyo Univ. of Science) MW2018-124		 We report a class D power amplifier designed for use at 500 MHz. The power amplifier is fabricated as an integrated circ... [more] MW2018-124
pp.61-65
MW, EMCJ, EST, IEE-EMC [detail] 2017-10-19
09:40		 Akita Yupopo Comparison of Power Combining Methods in Power-amplifier-inserted Transversal Filter for EPWM Transmitters
Yuto Tanaka, Yohtaro Umeda (TUS), Yusuke Kozawa (Ibaraki Univ.) EMCJ2017-32 MW2017-84 EST2017-47		 This paper compares power-amplifier-inserted transversal filter (PAITF) with 180º hybrids and T-junctions for envelope p... [more] EMCJ2017-32 MW2017-84 EST2017-47
pp.11-15
MW, EMCJ, EST, IEE-EMC [detail] 2017-10-20
10:25		 Akita Yupopo A Quadrature-modulation EPWM Transmitter That Uses Co-phase Sine Wave Carriers for I/Q Channel and a 90° Hybrid as a Signal Combiner
Tomoaki Morita, Ryo Sakai, Yohtaro Umeda (Tokyo Univ. of Science), Yusuke Kozawa (Ibaraki Univ.) EMCJ2017-45 MW2017-97 EST2017-60		 Quadrature-modulation (QM) envelope-pulse-width modulation (EPWM) transmitter with a 180° hybrid as a power combiner has... [more] EMCJ2017-45 MW2017-97 EST2017-60
pp.105-110
MW, ICD 2017-03-03
09:25		 Okayama Okayama Prefectural Univ. Quadrature-modulation Envelope-pulse-width-modulation Transmission System Using Quadrature Polarized Waves
Ryo Sakai, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Science) MW2016-204 ICD2016-134		 This paper presents quantitative evaluation of power efficiency decrese by not satisfying the zero current switching (ZC... [more] MW2016-204 ICD2016-134
pp.89-94
MW, ICD 2017-03-03
10:50		 Okayama Okayama Prefectural Univ. Speeding up using Parallel-Serial conversion in FPGA implementation of quadrature modulation Envelope Pulse Width Modulation Transmitter
Kouhei Nagasawa, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Science) MW2016-207 ICD2016-137		 This paper presents a new configuration using a serializer on quadrature-modulation (QM) envelope-pulse-width-modulation... [more] MW2016-207 ICD2016-137
pp.107-112
MW 2014-11-21
10:55		 Nagasaki Nagasaki Univ. Quadrature-modulation Transmitter with Tri-level Delta-sigma Modulation for Generating Bi-level EPWM Signal
Takashi Noda, Wataru Someya, Yoshiharu Iikura, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Science) MW2014-139		 This paper presents a quadrature-modulation (QM) envelope-pulse-width-modulation (EPWM) transmitter with delta-sigma tri... [more] MW2014-139
pp.83-88
MW 2014-11-21
11:20		 Nagasaki Nagasaki Univ. A Polar-modulation EPWM Transmitter with a Class-D Amplifier for OFDM Transmission
Yoshiharu Iikura, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Sience) MW2014-140		 Power amplifiers for wireless communication systems demand high power efficiency and linearity. Of the available types o... [more] MW2014-140
pp.89-94
MW 2014-03-05
15:25		 Ehime Ehime University Modulation Accuracy of a Polar-modulation EPWM Transmitter with a NMOS-type Class-D Power Amplifier
Yoshiharu Iikura, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Science) MW2013-221		 Switching-mode power amplifiers for wireless communication systems demand high power efficiency and linearity. Of the av... [more] MW2013-221
pp.139-144
 Results 1 - 9 of 9  /   
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