Polynomial 2.1 GHz RF predistorter IC with envelope injection output

Authors:
Olli Kursu;Marko Riikola;Janne Aikio;Timo Rahkonen
Affiliations:
Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, Oulu, Finland FIN-90014;Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, Oulu, Finland FIN-90014;Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, Oulu, Finland FIN-90014;Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, Oulu, Finland FIN-90014
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2007

Citing 2
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MWSCAS '98 Proceedings of the 1998 Midwest Symposium on Systems and Circuits

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Abstract

This paper presents the structure, test setup and measured results of a polynomial RF predistorter IC fabricated in a 0.35 驴m SiGe BiCMOS process. The predistorter is designed for the base station WCDMA band at 2.1 GHz. The predistortion signal is generated by a 5th-degree complex polynomial. Also a squared envelope is generated that can be used as a baseband injection signal to cancel 2nd-order distortion that typically causes memory effects. The performance of the predistorter was measured by driving a three-stage discrete power amplifier chain by a 2-tone test and a 3.84 MHz wide 3GPP WCDMA modulated signal. The 2-tone test showed more than 20 dB IM3 cancellation and the WCDMA signal's ACPR was improved by 8 dB.