Title :
Signal pre-distortion and bandwidth requirements for Sequential Power Amplifiers
Author :
Lehmann, Thomas ; Knöchel, Reinhard
Author_Institution :
Microwave Res. Lab., Univ. of Kiel, Kiel, Germany
Abstract :
This paper presents a linearization approach for Sequential Power Amplifiers (SPAs) through pre-distortion. The signal characteristics and pre-distortion waveforms for the main and peaking amplifiers are derived mathematically. The pre-distortion approach is validated experimentally by measurement of the reconstructed signals. It is found that the signal characteristics results in an at least three fold bandwidth of the signal. Rules for bandwidth restriction in the individual PA channels are given and the effect of a reduced bandwidth on the average efficiency of SPAs is shown.
Keywords :
distortion; power amplifiers; signal representation; waveform analysis; PA channel; bandwidth requirement; bandwidth restriction; linearization approach; sequential power amplifier; signal bandwidth; signal characteristics; signal predistortion waveform; signal reconstruction; Bandwidth; Directional couplers; Field programmable gate arrays; Linearity; Microwave amplifiers; Nonlinear distortion; Power amplifiers; Power generation; Radiofrequency amplifiers; Statistics; Efficiency; rf power amplifiers; transmitters;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5515564
