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:
Sep. 02, 2008
Filed:
Sep. 20, 2005
Gunnar Persson, Spånga, SE;
Gerlach Spee, Ösmo, SE;
Gunnar Persson, Spånga, SE;
Gerlach Spee, Ösmo, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to an analog predistorter () having a tunable amplitude () and/or phase () expansion. The predistorter () includes a coupler () having an input port (), an output port (), a first () and a second () coupled port separated by 90 degrees. A first compensation circuit (A) is connected to the first coupled port () and comprises a first combination (A) of linear (A) and nonlinear (A) circuit elements and a first impedance adjusting unit (A) for adjusting the impedance seen by the nonlinear circuit element (A). A second compensation circuit (B) is connected to the second coupled port () and comprises a second combination (B) of linear (B) and nonlinear (B) circuit elements a second impedance adjusting unit (B) for adjusting the impedance seen by said nonlinear circuit element (B). By adjusting the impedances seen by the nonlinear circuit elements (IA,B) the amplitude () and/or phase () expansion of the predisorter () are tuned.