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:
Jul. 13, 2010
Filed:
Apr. 10, 2006
Mats Klingberg, Enskede, SE;
Tony Fonden, Kista, SE;
Mats Klingberg, Enskede, SE;
Tony Fonden, Kista, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to a predistorter for reducing memory effects in RF power amplifiers. The invention also relates to a method for reducing memory effects in RF power amplifiers and to a base station including such a predistorter. A predistorter according to the invention includes first means () for generating a first signal component, which is an estimate of a drain current of said amplifier, which means () for generating said first signal component comprises a linear filter, second means () for generating a second signal component as a function of said first signal component and at least one first gain function; third means () for generating a third signal component as a function of a conjugate of said first signal component and at least one second gain function, and fourth means () for combining at least said second signal component and said third signal component to form an output signal. The output signal from the predistorter is further used as input to the power amplifier, which when amplified reduces the memory effects of the amplifier.