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:
Apr. 28, 2015
Filed:
May. 05, 2011
David Gustafsson, Göteborg, SE;
Christian Fager, Göteborg, SE;
David Gustafsson, Göteborg, SE;
Christian Fager, Göteborg, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
The present disclosure provides a power amplifier comprising a main amplifier and an auxiliary amplifier. The power amplifier is configured to deliver an output power P. A First Efficiency Peak (FEP) is defined as a first efficiency peak in the power ratio Pto P. Pis a maximum power output of the power amplifier and Pdefines a power ratio at the FEP. The main amplifier is configured to be biased by a main amplifier bias Vthat is substantially equal to an auxiliary amplifier bias Vtimes xwith xbeing a main amplifier output current in relation to the maximum current through the main amplifier when Pequals P. The impedances of a load and a main amplifier transmission line are arranged to be substantially equal. A corresponding method and a node in a wireless communication system comprising the power amplifier are also disclosed.