Modulators – Phase modulator – Including amplitude modulator
Reexamination Certificate
2008-04-15
2008-04-15
Chang, Joseph (Department: 2817)
Modulators
Phase modulator
Including amplitude modulator
C332S150000, C332S151000, C455S127100
Reexamination Certificate
active
07358829
ABSTRACT:
Transmission apparatus capable of reducing distortion of the vector modulation wave that is the transmission output to a sufficiently small level is provided. An amplifying section (105) generates a vector modulation wave based on an amplitude component modulation signal and a phase modulation wave. A synchronous demodulating section (107) detects the vector modulation wave, generates a synchronous demodulation signal, and sends this to a band filtering section (108). The band filtering section (108) extracts a signal of the frequency component of the distortion from a synchronous demodulation signal outputted by the synchronous demodulating section (107). A controlling section (109) then refers to the distortion component signal extracted by the band filtering section (108), controls a delay time adjusting section (103) in such a manner that the signal level of the distortion component becomes small, adjusts a delay time difference between the amplitude component modulation signal and the phase component modulation signal, and reduces distortion of the modulation wave.
REFERENCES:
patent: 6366177 (2002-04-01), McCune et al.
patent: 2005/0079835 (2005-04-01), Takabayashi et al.
patent: 2006/0202774 (2006-09-01), Hirano
patent: 2004 128933 (2004-04-01), None
patent: 2004 356835 (2004-12-01), None
International Search Report dated May 30, 2006 with English translation.
P. Kenington, “High-Linearity RF Amplifier Design,” Artech House Inc., www.artechhouse.com, ISBN 1-58053-143-1, Table of Contents and pp. 426-443, 2000.
Chang Joseph
Dickinson Wright PLLC
Matsushita Electric - Industrial Co., Ltd.
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