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:
Oct. 25, 2005
Filed:
Aug. 28, 2002
Naoki Hongo, Tokyo, JP;
Yoichi Okubo, Tokyo, JP;
Masaki Suto, Tokyo, JP;
Tetsuhiko Miyatani, Tokyo, JP;
Naoki Hongo, Tokyo, JP;
Yoichi Okubo, Tokyo, JP;
Masaki Suto, Tokyo, JP;
Tetsuhiko Miyatani, Tokyo, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
To provide an amplifying device which is reduced in size, weight and cost and which can improve the distortion compensation performance. In the amplifying device, input signals are each subjected to digital orthogonal modulation using an IF and further to offset rotation processing in digital orthogonal modulators, then bifurcated into a main signal system and a control system, and detection of a power value is performed at an IF band in a power detecting section of the control system. Therefore, offset rotation processing of the input signals in the power detection is not required, so that a structure for matching phases of a multi-carrier signal and a power value signal is not required, resulting in improving the distortion compensation performance without using an analog delay line.