Title :
A highly efficient chireix amplifier using adaptive power combining
Author :
Qureshi, J. ; Liu, R. ; de Graauw, A.J.M. ; van der Heijden, M.P. ; Gajadharsing, J. ; de Vreede, L.C.N.
Author_Institution :
DIMES, Delft University of Technology, Feldmannweg 17, 2628 CT, The Netherlands
Abstract :
A novel, highly efficient out-phasing amplifier with adaptive power combiner is presented. Saturated class-F operation is used for the amplifier cells. Varactor tuning is applied to make the output power combining network adaptive. Use of optimum input drive conditions and output varactor tuning, to eliminate imaginary loading introduced by the out-phasing principle, yields an amplifier efficiency of more than 50% over a 9 dB power back-off range.
Keywords :
circuit tuning; power amplifiers; varactors; adaptive power combining; highly efficient chireix amplifier; out-phasing amplifier; output varactor tuning; power amplifiers; varactor tuning; Amplitude modulation; Circuits; High power amplifiers; Operational amplifiers; Power amplifiers; Power combiners; Power generation; Transmitters; Varactors; Voltage; Chireix; LINC; Power amplifier; adaptive matching; high efficiency; out-phasing; varactor;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4632943
