Title :
Maximizing efficiency and linearitry
Author_Institution :
PolyGrames Res. Center, Ecole Polytech. de Montreal, Montreal, QC, Canada
fDate :
8/1/2009 12:00:00 AM
Abstract :
In, this paper, a detailed analysis of the optimum performance of various Doherty amplifier configurations in terms of output power, efficiency, and output power backoff ensuring a near-peak efficiency was presented. Closed-form design equations for the determination of the load RL and impedance Zc were derived for each configuration. An experimental realization at 1.9 GHz of a Doherty amplifier was presented. An efficiency of 43% was measured at 4 dB backoff from P1dB of 27 dBm.
Keywords :
UHF power amplifiers; Doherty amplifier configurations; closed-form design equations; efficiency; frequency 1.9 GHz; impedance; output power; output power backoff; Circuit faults; Digital modulation; Impedance; Linearity; Power amplifiers; Power generation; Power supplies; Radiofrequency amplifiers; Region 2; Satellite communication;
Journal_Title :
Microwave Magazine, IEEE
DOI :
10.1109/MMM.2009.932837
