Title :
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
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;
Conference_Titel :
Microwave Conference, 2008. EuMC 2008. 38th European
Conference_Location :
Amsterdam
Print_ISBN :
978-2-87487-006-4
DOI :
10.1109/EUMC.2008.4751519
