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. 18, 2011
Filed:
Dec. 17, 2008
Kenichi Horiguchi, Tokyo, JP;
Naoko Matsunaga, Tokyo, JP;
Ryoji Hayashi, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Provided is a predistorter which compensates for a memory effect occurring in an amplifier used in a communication device, especially an electric memory effect as well. The predistorter includes: a distortion compensation circuit () for compensating for a nonlinear distortion caused by an amplifier (), in which the distortion compensation circuit outputs a predistortion signal to be input to the amplifier. The predistorter includes: first filter section () which is connected between the distortion compensation circuit and the amplifier, for compensating for a frequency characteristic appearing in a signal component occurring in an entire analog circuit including the amplifier; and second filter section () which is connected between the distortion compensation circuit and the first filter section or between the first filter section and the amplifier, for compensating for a frequency characteristic appearing in a distortion component occurring in the amplifier.