| US 7,593,480 B2 | ||
| Transmission device and radio communication device | ||
| Masaharu Udagawa, Tokyo (Japan); Mamoru Arayashiki, Kanagawa (Japan); and Yoshihiro Hara, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/598,695 PCT Filed Mar. 09, 2005, PCT No. PCT/JP2005/004127 § 371(c)(1), (2), (4) Date Sep. 08, 2006, PCT Pub. No. WO2005/088842, PCT Pub. Date Sep. 22, 2005. |
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| Claims priority of application No. 2004-068003 (JP), filed on Mar. 10, 2004. | ||
| Prior Publication US 2007/0183530 A1, Aug. 09, 2007 | ||
| Int. Cl. H04K 1/02 (2006.01); H04L 25/03 (2006.01); H04L 25/49 (2006.01) | ||
| U.S. Cl. 375—297 [375/259] | 4 Claims |
| 1. A transmission apparatus using a polar modulation scheme, comprising:
an amplitude phase separator that separates baseband modulation data into a baseband amplitude modulation signal and a baseband
phase modulation signal;
a phase modulator that modulates a high frequency carrier signal based on the baseband phase modulation signal and forms a
high frequency phase modulation signal;
a variable gain amplifier that is provided in a later stage of said phase modulator and amplifies the high frequency phase
modulation signal; and
a high frequency power amplifier that is provided in a later stage of said variable gain amplifier and amplifies power of
the high frequency phase modulation signal amplified by said variable gain amplifier,
wherein said variable gain amplifier comprises:
a linear-log converter that linear-log converts the baseband amplitude modulation signal; and
an amplifier that amplifies the high frequency phase modulation signal based on the linear-log converted baseband amplitude
modulation signal and a gain control signal.
|