Power Amplifier Efficiency Enhancement Using Adaptive Load Transformation

Author

Lehmann, Thomas ; Knoechel, Reinhard

Author_Institution

Inst. of Electr. & Inf. Eng., Univ. of Kiel, Kiel

fYear

2009

fDate

16-18 March 2009

Firstpage

1

Lastpage

4

Abstract

An adaptive load transformation technique utilizing switched coupled lines as impedance transformers is proposed to improve the back-off efficiency of power amplifiers. This transformer technique is capable of presenting nearly any desired real impedance value at the input while simultaneously handling high powers. The load impedance can be switched between a defined minimum and maximum value by switched coupled lines. Therefore application in high power amplifiers is possible. The transformer is explained in detail and measurement results for impedance transformation and insertion loss are presented. Finally measurement results for application in a PA are also given.

Keywords

impedance convertors; power amplifiers; adaptive load transformation; back-off efficiency; impedance transformers; power amplifier efficiency enhancement; switched coupled lines; Base stations; High power amplifiers; Impedance; Microwave amplifiers; Microwave antenna arrays; Phase transformers; Phased arrays; Power amplifiers; Radio frequency; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009 German

Conference_Location

Munich

Print_ISBN

978-3-9812668-0-1

Electronic_ISBN

978-3-8007-3150-3

Type

conf

DOI

10.1109/GEMIC.2009.4815871

Filename

4815871