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:
Sep. 06, 2005
Filed:
Nov. 30, 2001
Feedforward amplifier, communication apparatus, feedforward amplification method, program and medium
Masayuki Miyaji, Kyoto, JP;
Kaoru Ishida, Osaka, JP;
Toshimitsu Matsuyoshi, Osaka, JP;
Hisashi Adachi, Osaka, JP;
Seiji Fujiwara, Kanagawa, JP;
Masayuki Miyaji, Kyoto, JP;
Kaoru Ishida, Osaka, JP;
Toshimitsu Matsuyoshi, Osaka, JP;
Hisashi Adachi, Osaka, JP;
Seiji Fujiwara, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The conventional feedforward amplifier is unable to suppress distortion components efficiently. The present invention provides a feedforward amplifier wherein the vector adjustor is adjusted so that (1) suppression is performed on only the distortion component generated within a predetermined frequency range out of the range of frequencies to be suppressed in which distortion components to be suppressed occur or (2) the suppression of the distortion component generated within the predetermined frequency range is greater than the suppression of the distortion component generated within the frequency range other than the predetermined frequency range out of the range of frequencies to be suppressed, and the pre-distortion circuit is adjusted so that at least the distortion component generated within the frequency range other than the predetermined frequency range is suppressed.