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 (1.2MB)
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 (2.2MB)
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 (1.2MB)
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 (883.2KB)
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 (829.1KB)
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 (1.2MB)