| US 7,541,864 B2 | ||
| Power amplifier and pulse-width modulated amplifier | ||
| Carsten Rasmussen, Frederiksberg (Denmark) | ||
| Assigned to Silicon Power Devices APS, Lyngby (Denmark) | ||
| Appl. No. 11/569,965 PCT Filed Jun. 06, 2005, PCT No. PCT/DK2005/000370 § 371(c)(1), (2), (4) Date Feb. 19, 2007, PCT Pub. No. WO2005/119904, PCT Pub. Date Dec. 15, 2005. |
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| Prior Publication US 2008/0001660 A1, Jan. 03, 2008 | ||
| Int. Cl. H03G 3/30 (2006.01); H03G 5/16 (2006.01) | ||
| U.S. Cl. 330—10 [330/136; 330/297; 330/127; 455/114.3; 455/127.2; 375/296; 375/308; 375/315] | 18 Claims |
| 1. A power amplifier for generating a power amplified output signal from an input signal, said power amplifier comprising:
a phase amplification path, and
a phase amplification stage within said phase amplification path, wherein the phase amplification stage receives a magnitude component of the power amplified output signal, and the phase amplification
stage is responsive to a phase component of the input signal, a magnitude component of the input signal, and the received
magnitude component of the power amplified output signal for generating said power amplified output signal, andwherein the phase amplification stage comprises
a difference detector for generating an output depending on the difference between the received magnitude component of the
input signal and the received magnitude component of the power amplified output signal,
an amplitude to phase converter for converting the output of the difference detector to a phase difference signal, and
a phase shifter with a first phase shifter for shifting the phase of a first phase signal, which first phase signal is a function
of the phase component of the input signal, with the phase difference generated by the amplitude to phase converter, and a
second phase shifter for shifting the phase of the first phase signal with the inverse of the phase difference generated by
the amplitude to phase converter.
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