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. 01, 2008
Filed:
Dec. 22, 2003
Kazumi Shiikuma, Minato-ku, JP;
Kazumi Shiikuma, Minato-ku, JP;
NEC Corporation, Tokyo, JP;
Abstract
Pre-distortion compensation circuits () are disposed at stages previous to carrier amplifierand peak amplifier, respectively. Pre-distortion compensation circuit () has such characteristics that compensate carrier amplifier () for a distortion characteristically produced on the operation thereof, particularly, an amplitude-phase (AM-PM) distortion, while pre-distortion compensation circuit () has such characteristics that compensate peak amplifier () for a distortion characteristically produced on the operation thereof, particularly, an AM-PM distortion. Thus, the Doherty amplifier is also compensated for its own AM-PM distortion characteristic to accomplish a low distortion characteristic and implement an ideal power combining operation thereof.