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. 04, 2005
Filed:
Nov. 05, 2002
Yasunori Suzuki, Yokohama, JP;
Toshio Nojima, Sapporo, JP;
Yasunori Suzuki, Yokohama, JP;
Toshio Nojima, Sapporo, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
In a feedforward amplifier with a dual loop in which a distortion injection path of a distortion elimination circuitis provided as a feedforward configuration composed of a first auxiliary amplifier distortion elimination circuitand a first auxiliary amplifier distortion elimination circuit, a second variable attenuatorand a second variable phase shifterare provided preceding the distortion detection circuita second pilot signal injected between stages of a main amplifieris detected by a directional couplerand the second variable attenuatorand the second variable phase shifterare controlled by a second controllerto minimize the level of the detected second pilot signal, thereby bringing the distortion elimination circuit and the first auxiliary distortion detection circuit into balance at the same time.