Transmitter and communication apparatus

Details Transmitter and communication apparatus Transmitter and communication apparatus

2007-10-11

2010-11-23

Phu, Sanh D (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S115100, C455S114200, C455S127300, C330S135000, C330S136000, C375S297000

Reexamination Certificate

active

07840193

ABSTRACT:
A modulator23corrects an amplitude signal Rd by adding thereto an offset value α and generates, based on the corrected amplitude signal Rd, an amplitude signal Ra for amplitude-modulating a radio-frequency signal. The modulator23includes: an offset voltage measurement section109operable to measure an offset voltage V2calof the amplitude signal Ra; a correction value calculation section110operable to obtain a difference value ΔV2calbetween the offset voltage V2calmeasured by the offset voltage measurement section109and an initial value of the offset voltage V2caland operable to calculate, based on the difference value ΔV2cal, a correction value VODACfor correcting the offset voltage V2cal; and an addition section106operable to add the correction value VODACcalculated by the correction value calculation section110to a signal processed until the amplitude signal Ra is generated from the amplitude signal Rd.

REFERENCES:
patent: 6366177 (2002-04-01), McCune et al.
patent: 6701138 (2004-03-01), Epperson et al.
patent: 7116951 (2006-10-01), Nagode et al.
patent: 7499502 (2009-03-01), Morimoto et al.
“Simple polar-loop transmitter for dual-mode Bluetooth”, Takashi Oshima and Masaru Kokubo, Hitachi, Ltd., Central Research Laboratory, Circuits and Systems, 2005, ISCAS 2005. IEEE International Symposium on May 23-26, 2005, pp. 3966-3969, vol. 4.

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