The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2013
Filed:
Jul. 31, 2009
Akira Nagayama, Tokyo, JP;
Yasuhiko Fukuoka, Tokyo, JP;
Kouichi Maruta, Kagoshima, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
To provide a power amplification device that can amplify an input signal having an envelope variation with high power-added efficiency in a wide frequency range, and a transmission device and a communication device using the power amplification device. A first orthogonal signal (Sd) is generated by performing vector subtraction between first and second fundamental signals (Suand Su) having the same amplitude and a phase difference δθ (0 degrees<δθ<180 degrees) therebetween. First and second fundamental signals are generated based on an input signal (Sin). A second orthogonal signal (Sd) is generated by performing vector addition between the first and second fundamental signals (Suand Su). First and second constant envelope signals (Sand S) are generated by performing vector addition between the second fundamental signal (Su) and first and second constant envelope vector generation signals (e and −e) obtained based on the first fundamental signal (Su). An output signal (Sout) obtained by amplifying the input signal (Sin) is output based on the first and second constant envelope signals (Sand S).