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:
Aug. 07, 2007
Filed:
Dec. 12, 2001
Satoshi Maruyama, Kawasaki, JP;
Osamu Mita, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Norio Tozawa, Kawasaki, JP;
Fumihiko Kobayashi, Kawasaki, JP;
Satoshi Maruyama, Kawasaki, JP;
Osamu Mita, Kawasaki, JP;
Yasuyuki Oishi, Kawasaki, JP;
Tokuro Kubo, Kawasaki, JP;
Norio Tozawa, Kawasaki, JP;
Fumihiko Kobayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A parallel operation system of transmission amplifiers enable the parallel running by the two distortion compensation amplifiers using the digital pre-distorter system and to provide a parallel operation system of the transmission amplifiers that makes it possible to switch to respective single running easily. The parallel operation system includes first and second transmission amplifiers which receive common input signals for outputting amplified signals from respective ones; and a coupling unit which combines outputs of the first and second transmission amplifiers, to provide as its output; the first and second transmission amplifiers each having a main amplifier; and a modulation unit disposed on the input side of the main amplifier; wherein the output of one of the modulation units included in the first and second transmission amplifiers is fed in common to the main amplifiers included in the first and second transmission amplifiers.