| US 7,499,502 B2 | ||
| Amplifier, information communication apparatus and amplification method | ||
| Shigeru Morimoto, Osaka (Japan); Hisashi Adachi, Osaka (Japan); and Toru Matsuura, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Mar. 21, 2006, as Appl. No. 11/385,479. | ||
| Application 11/385479 is a continuation of application No. PCT/JP2005/008073, filed on Apr. 27, 2005. | ||
| Claims priority of application No. 2004-132006 (JP), filed on Apr. 27, 2004. | ||
| Prior Publication US 2006/0159198 A1, Jul. 20, 2006 | ||
| Int. Cl. H04K 1/02 (2006.01); H04L 25/03 (2006.01); H04L 25/49 (2006.01) | ||
| U.S. Cl. 375—297 [330/133; 330/134; 330/135; 330/136] | 8 Claims |
| 1. An amplifier of carrying out polar modulation by inputting amplitude data and phase data generated respectively by coding
data or signals, comprising:
a phase modulator of generating a phase modulation signal from the phase data;
a gain adjusting instrument of determining the output level of the phase modulation signal on the basis of a level control
signal indicating the level of an amplitude modulation signal, and adjusting the level of the phase modulation signal so that
the phase modulation signal has the output level;
a voltage adjusting instrument of determining a DC offset value on the basis of the amplitude data and the level control signal
which is used for adjustment of the level of the phase modulation signal, and generating the amplitude modulation signal to
which the DC offset value is added; and
an amplification device having an input terminal to which the phase modulation signal is input and a power supply terminal
to which the amplitude modulation signal is input, and generating a modulation signal subjected to polar modulation using
the phase modulation signal input and the amplitude modulation signal input, wherein
the DC offset value is determined so that in the amplification device the relationship between the modulation signal generated
and the amplitude modulation signal becomes a linear relationship at least in a part of a region of a characteristic of the
amplification device.
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