| US 7,460,843 B2 | ||
| Amplifier apparatus, polar modulation transmission apparatus and wireless communication apparatus | ||
| Taichi Ikedo, Yokohama (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Mar. 17, 2006, as Appl. No. 11/377,279. | ||
| Claims priority of application No. 2005-076898 (JP), filed on Mar. 17, 2005. | ||
| Prior Publication US 2006/0234655 A1, Oct. 19, 2006 | ||
| Int. Cl. H01Q 11/12 (2006.01); H04B 1/04 (2006.01) | ||
| U.S. Cl. 455—127.1 [455/114.2; 375/297; 330/127] | 8 Claims |
| 1. An amplifier apparatus, having a non-linear high-frequency power amplifier amplifying a first input signal and a power
supply voltage control section receiving as input an external power supply forming a power supply voltage for the high-frequency
amplifier based on a second input signal, amplifying the signal level of the first input signal using the high-frequency power
amplifier to a level corresponding to the second input signal,
the power supply voltage control section having a delta modulator configuration or a delta-sigma modulator configuration and
comprising:
a quantizer quantizing a signal according to a signal level of the second input signal;
a plurality of down-samplers down-sampling quantized outputs obtained from the quantizer at a lower speed than a sampling
rate of the quantizer and with respective phases shifted; and
a combiner combining outputs of the plurality of down-samplers.
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