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. 08, 2008
Filed:
Sep. 19, 2003
Hiromichi Hayase, Tokyo, JP;
Hiromichi Hayase, Tokyo, JP;
Hitachi Kokusai Electric Inc., Tokyo, JP;
Abstract
An amplifier apparatus in which a signal is amplified by an amplifier and distortion produced by the amplifier is compensated for, that can continue to operate even in cases where the amplitude of a distortion component contained in the amplified signal after distortion compensation has become large. Distortion component amplitude detection meansanddetect the amplitude of distortion components produced by the amplifierthat are contained in signals amplified by the amplifierafter distortion compensation, and when the amplitude of a detected distortion component exceeds a predetermined threshold value, amplified signal level reduction control meansandperform control to reduce the level of the signal amplified by the amplifier. In the distortion compensation, the predistortion circuitgenerates distortion in respect of a signal that has not yet been amplified by the amplifier, and based on the detected amplitude of the distortion component, predistortion control meanscontrols the distortion produced by the predistortion circuit