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. 20, 2004
Filed:
Jun. 07, 2002
Arne Rydin, Fjärdhundra, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
An amplifier system ( ) for radio frequency signals comprises a phase and gain adjuster ( ) which receives an input signal and a control vector (C) for producing a distortion-adjusted input signal. The distortion-adjusted input signal is applied to a main amplifier ( ) which generates an amplified output signal. A control loop generates a control vector (P) indicative of distortion of the main amplifier. A modified pre-distortion vector generator ( ) generates a modified pre-distortion vector (P′) which is combined with the control vector to produce a composite control vector (Comp). The composite control vector is applied to the phase and gain adjuster, thereby enabling the phase and gain adjuster to produce the distortion-adjusted input signal. In essence, the modified pre-distortion vector generator performs a vector multiplication (coordinate rotation) of a pre-distortion vector so that the resultant modified pre-distortion vector has a proper direction relative to the control vector.