Differentially coupled outphasing WCDMA transmitter with inverse class F power amplifiers

Author

Gerhard, Walter ; Knoechel, R.

Author_Institution

Microwave Lab., Kiel Univ., Germany

fYear

2006

Firstpage

355

Lastpage

358

Abstract

This paper presents design and practical implementation of an outphasing WCDMA transmitter with highly efficient inverse class F packaged LDMOS power amplifiers (PA´s). Both PA´s are modeled as phase-modulated voltage sources connected in series, being differentially coupled at the output. The implementation of differential coupling with voltage sources is an alternative to the conventional design. The circuit operates as theoretically predicted. A peak power of 24 W with a peak drain efficiency of 61% and for a 5 dB PAR (peak to average ratio) QPSK signal a drain efficiency of 32 % is reported. The performance of the transmitter and measurement results are presented.

Keywords

broadband networks; code division multiple access; power amplifiers; quadrature phase shift keying; transmitters; 24 W; 32 percent; 5 dB; 61 percent; QPSK signal; differential coupling; inverse class F power amplifiers; outphasing WCDMA transmitter; peak to average ratio; phase-modulated voltage sources; Coupling circuits; Differential amplifiers; High power amplifiers; Multiaccess communication; Packaging; Peak to average power ratio; Power amplifiers; Quadrature phase shift keying; Transmitters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium, 2006 IEEE

Print_ISBN

0-7803-9412-7

Type

conf

DOI

10.1109/RWS.2006.1615168

Filename

1615168