An Efficiency Optimized Controlling Scheme for Dynamic Load Modulation of Power Amplifiers

Author

Nemati, Hossein M. ; Fager, Christian ; Gustavsson, Ulf ; Zirath, Herbert

Author_Institution

Dept. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Gothenburg

fYear

2008

fDate

27-31 Oct. 2008

Firstpage

583

Lastpage

586

Abstract

An efficiency optimized controlling scheme for dynamic load modulation (DLM) of power amplifiers (PAs) is proposed. In this scheme, both the input signal and load impedance are controlled to allow high efficiency operation of PAs for a desired output signal modulation. The proposed technique is demonstrated by two 1 GHz, LDMOS, switched mode power amplifiers (SMPAs) which are characterized by varying the input power during load-pull measurements. It is shown that the power-added efficiency (PAE) of the PAs in back-off operation can significantly be improved by the optimum controlling scheme.

Keywords

microwave power amplifiers; modulation; LDMOS; dynamic load modulation; efficiency optimized controlling scheme; frequency 1 GHz; load impedance; load-pull measurements; power amplifiers; power-added efficiency; switched mode amplifiers; Dynamic range; Impedance; Microwave amplifiers; Power amplifiers; Power generation; Transmitters; Varactors; Virtual colonoscopy; Voltage control; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2008. EuMC 2008. 38th European

Conference_Location

Amsterdam

Print_ISBN

978-2-87487-006-4

Type

conf

DOI

10.1109/EUMC.2008.4751519

Filename

4751519