A 20-W Chireix Outphasing Transmitter for WCDMA Base Stations

Author

Huttunen, Anu ; Kaunisto, Risto

Author_Institution

Nokia Res. Center, Helsinki

Volume

55

Issue

12

fYear

2007

Firstpage

2709

Lastpage

2718

Abstract

A Chireix outphasing transmitter for Band I wideband code-division multiple-access base stations was implemented using a nonisolating power combiner and two high-efficiency saturated class-B power amplifiers for 20-W single-carrier power levels. Novel adaptive background calibration algorithms were developed and demonstrated for the mismatch calibration and phase predistortion of the two transmitter chains. The complete demonstrator was able to achieve an average efficiency of 30% for a 3GPP TestModel64 signal, measured at a channel output power of 20 W and an adjacent channel power ratio of -45 dB.

Keywords

calibration; code division multiple access; power amplifiers; power combiners; radio transmitters; 3GPP TestModel 64 signal; Chireix outphasing transmitter; WCDMA base stations; adaptive background calibration; class-B power amplifiers; nonisolating power combiner; phase predistortion; power 20 W; wideband code-division multiple-access base stations; Base stations; Broadband amplifiers; Calibration; High power amplifiers; Multiaccess communication; Power combiners; Power measurement; Predistortion; Testing; Transmitters; Chireix outphasing; RF power amplifiers (PAs); linear amplification with nonlinear components (LINC); linear transmitters; predistortion;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2007.907140

Filename

4383078