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

fYear

2006

fDate

11-16 June 2006

Firstpage

1887

Lastpage

1890

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2006. IEEE MTT-S International

Conference_Location

San Francisco, CA

ISSN

0149-645X

Print_ISBN

0-7803-9541-7

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2006.249783

Filename

4015325