An Active Cuber Circuit for Power Amplifier Analog Predistortion

Author

Roselli, L. ; Borgioni, V. ; Palazzari, V. ; Alimenti, F.

Author_Institution

Dept. of Electronic and Information Engineering, University of Perugia. via G. Duranti 93, 06125 Perugia, Italy. Tel: +39-75-585.3633, Fax: +39-75-585.3654, e-mail: roselli@diei.unipg.it

fYear

2003

fDate

Oct. 2003

Firstpage

1219

Lastpage

1222

Abstract

This work deals with an active balanced cuber-circuit that can be used as IM3 generator in analog predistortion systems for mean power amplifiers. Such a circuit exploits the odd non-linear characteristic of a B-class push-pull amplifier and, compared with conventional diode designs, shows an improved third-order generation. A laboratory prototype of the cuber has been realized and inserted in a predistortion system and, as a next step, a pre-industrialized predistorter prototype has been realized using the active-cuber block: the whole system seems to be flexible enough to be used for the IM3 linearization of PAs. From experimental results obtained from a target 6W power amplifier we found that more than 8 dB of correction can be achieved in a fractional bandwidth of about 10%.

Keywords

Character generation; Circuits; Linearity; Nonlinear distortion; Phase distortion; Power amplifiers; Predistortion; Prototypes; Schottky diodes; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2003 33rd European

Conference_Location

Munich, Germany

Print_ISBN

1-58053-834-7

Type

conf

DOI

10.1109/EUMA.2003.340799

Filename

4143243