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Paper Abstract and Keywords
Presentation 2017-10-20 10:25
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.)
Abstract (in Japanese) (See Japanese page) 
(in English) Quadrature-modulation (QM) envelope-pulse-width modulation (EPWM) transmitter with a 180° hybrid as a power combiner has been proposed to suppress the switching loss due to the breaking of zero-current switching (ZCS) condition and, therefore, to increase the power efficiency. However, we found that the ZCS condition breaking still remains in I-channel of this transmitter. As a result, the power efficiency for I-ch decreases. To solve this problem we propose a QM-EPWM transmitter that uses sine-wave carriers for both I- and Q-channel with a 90° hybrid in this paper. The proposed transmitter eliminates the remaining switching loss due to the phase shift of the carrier in I-channel and increase the power efficiency. The increase in power efficiency of the proposed transmitter from the previous one is evaluated by computer simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) transmitter / power amplifier / class-D / envelope pulse-width modulation / quadrature modulation / power-added efficiency / zero current switching / 90° hybrid  
Reference Info. IEICE Tech. Rep., vol. 117, no. 244, MW2017-97, pp. 105-110, Oct. 2017.
Paper # MW2017-97 
Date of Issue 2017-10-12 (EMCJ, MW, EST) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee MW EMCJ EST  
Conference Date 2017-10-19 - 2017-10-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Yupopo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Electromagnetic simulation ,EMC, Microwave technologies 
Paper Information
Registration To MW 
Conference Code 2017-10-MW-EMCJ-EST-EMC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Quadrature-modulation EPWM Transmitter That Uses Co-phase Sine Wave Carriers for I/Q Channel and a 90° Hybrid as a Signal Combiner 
Sub Title (in English)  
Keyword(1) transmitter  
Keyword(2) power amplifier  
Keyword(3) class-D  
Keyword(4) envelope pulse-width modulation  
Keyword(5) quadrature modulation  
Keyword(6) power-added efficiency  
Keyword(7) zero current switching  
Keyword(8) 90° hybrid  
1st Author's Name Tomoaki Morita  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Ryo Sakai  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Yohtaro Umeda  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
4th Author's Name Yusuke Kozawa  
4th Author's Affiliation Ibaraki University (Ibaraki Univ.)
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Date Time 2017-10-20 10:25:00 
Presentation Time 20 
Registration for MW 
Paper # IEICE-EMCJ2017-45,IEICE-MW2017-97,IEICE-EST2017-60 
Volume (vol) IEICE-117 
Number (no) no.243(EMCJ), no.244(MW), no.245(EST) 
Page pp.105-110 
#Pages IEICE-6 
Date of Issue IEICE-EMCJ-2017-10-12,IEICE-MW-2017-10-12,IEICE-EST-2017-10-12 

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