Ryoji HAYASHI

Parallel Dual Modulus Prescaler with a Step Size of 0.5
Hideyuki NAKAMIZO Kenichi TAJIMA Ryoji HAYASHI Kenji KAWAKAMI Toshiya UOZUMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/07/01
Vol. E95-C  No. 7  pp. 1189-1194
Type of Manuscript:  Special Section PAPER (Special Section on Recent Trends of Microwave Systems and Their Fundamental Technologies)
Category: 
Keyword: 
phase locked loops, divider, phase noise, fractional-N frequency synthesizer, dual modulus prescaler, 
 Summary | Full Text:PDF
A Novel Spur Suppression Technique Using Three-Phase Holding Pulse for High-Frequency-Output Direct Digital Synthesizer
Kenichi TAJIMA Ryoji HAYASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/07/01
Vol. E93-C  No. 7  pp. 1014-1021
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
direct digital synthesizer, holding pulse, digital analog converter, 
 Summary | Full Text:PDF
A Wideband Digital Predistorter for a Doherty Power Amplifier Using a Direct Learning Memory Effect Filter
Kenichi HORIGUCHI Naoko MATSUNAGA Kazuhisa YAMAUCHI Ryoji HAYASHI Moriyasu MIYAZAKI Toshio NOJIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/07/01
Vol. E93-C  No. 7  pp. 975-982
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
predistortion, adaptive filter, memory effect, power amplifier, Doherty amplifier, 
 Summary | Full Text:PDF
Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique
Kenichi HORIGUCHI Satoru ISHIZAKA Masatoshi NAKAYAMA Ryoji HAYASHI Yoji ISOTA Tadashi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/09/01
Vol. E90-C  No. 9  pp. 1670-1677
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Active Devices/Circuits
Keyword: 
power amplifier, microwave Doherty amplifier, efficiency, orthogonal frequency division multiplexing (OFDM), predistortion, 
 Summary | Full Text:PDF
Novel Phase-Continuous Frequency Hopping Control for a Direct Frequency Synthesizer Using a Quadrature Mixer Driven by Two DDSs
Kenichi TAJIMA Ryoji HAYASHI Kenji ITOH Yoji ISOTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/12/01
Vol. E89-C  No. 12  pp. 1829-1835
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Microwave Techniques)
Category: Active Circuits/Devices/Monolithic Microwave Integrated Circuits
Keyword: 
frequency synthesizer, direct digital synthesizer, quadrature mixer, phase accumulator, overflow, phase, 
 Summary | Full Text:PDF
A Single-Chip 2.4-GHz RF Transceiver LSI with a Wide-Input-Range Frequency Discriminator
Hiroshi KOMURASAKI Hisayasu SATO Masayoshi ONO Ryoji HAYASHI Takeo EBANA Harunobu TAKEDA Kohji TAKAHASHI Yutaka HAYASHI Tetsuya IGA Kohichi HASEGAWA Takahiro MIKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/07/01
Vol. E85-C  No. 7  pp. 1419-1427
Type of Manuscript:  Special Section PAPER (Special Issue on Silicon RF Device & Integrated Circuit Technologies)
Category: 
Keyword: 
BiCMOS, RF, S band, frequency discriminator, transceiver, 
 Summary | Full Text:PDF