Behavioral level modeling of power amplifiers with varying antenna load

Author

Nielsen, Troels S. ; Tawfik, Shadi ; Larsen, Torben ; Lindfors, Saska

Author_Institution

Center for TelelnFraStruktur, Aalborg Univ., Denmark

Volume

2

fYear

2005

fDate

30 May-1 June 2005

Firstpage

963

Abstract

This paper presents an approach for behavioral level power amplifier modeling with varying antenna load. The derived model is based on device large signal S-parameter measurements of a commercially available W-CDMA power amplifier. A pulsed RF measurement setup, ensuring minimal device self-heating and providing variable complex load impedance, is described in detail. The use of polar and Cartesian representation of the power amplifier load impedance is discussed in terms of model complexity. The model validity is verified by comparing measured and simulate adjacent channel power ratios (ACPR). The measured and simulated ACPR show very good agreement and match at the nominal power amplifier drive level to within 2 dB over the maximum output VSWR ratings.

Keywords

antennas; code division multiple access; power amplifiers; radiofrequency amplifiers; Cartesian representation; W-CDMA power amplifier; adjacent channel power ratios; behavioral level power amplifier modeling; pulsed RF measurement; signal S-parameter measurements; varying antenna load; voltage standing wave ratios; Antenna measurements; Impedance; Load modeling; Loaded antennas; Power amplifiers; Power measurement; Pulse amplifiers; Pulse measurements; Radiofrequency amplifiers; Scattering parameters; antenna; behavioral; measurement; model; nonlinearity; power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st

ISSN

1550-2252

Print_ISBN

0-7803-8887-9

Type

conf

DOI

10.1109/VETECS.2005.1543449

Filename

1543449