Title :
Improvement of power amplifier efficiency by reactive Chireix combining, power back-off and differential phase adjustment
Author :
Gerhard, W. ; Knoechel, R.
Author_Institution :
Microwave Lab., Christian-Albrechts Univ. of Kiel
Abstract :
An interesting effect of output power back-off (OPBO) efficiency improvement is presented which is present if 2 power amplifiers (PA) utilizing a reactive output Chireix coupling are combined with input power back-off and differential phase adjustment for maximum efficiency peaking. The capability of significant efficiency improvement at power backoff is demonstrated and validated by means of simulations and measurements. The new design method delivers a power added efficiency (PAE) of 48% at 6dB OPBO and 35% at 10dB OPBO for a 25.7W Si-LDMOS PA at 2.14 GHz for a WCDMA basestation application
Keywords :
code division multiple access; microwave power amplifiers; 2.14 GHz; 25.7 W; Chireix coupling; LDMOS; LINC; RF power amplifier; WCDMA; basestation application; differential phase adjustment; power amplifier efficiency; power amplifiers; power back-off; reactive Chireix; Bandwidth; Differential amplifiers; Impedance; Laboratories; Microwave amplifiers; Multiaccess communication; Phase modulation; Power amplifiers; Power generation; Power measurement; Chireix; LDMOS; LINC; WCDMA; basestation; efficiency; outphasing; rf power amplifier;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249783
