Cartesian feedback for RF power amplifier linearization

We discuss two control problems that arise in connection with Cartesian feedback radio-frequency power amplifiers. New solutions to both problems are described, and the results of a working prototype are presented. The prototype, a integrated circuit (IC) fabricated in National Semiconductor's 0.25 /spl mu/m CMOS process, represents the first known fully integrated implementation of the Cartesian feedback concept.

[1]  T.H. Lee,et al.  Automatic phase alignment for a fully integrated CMOS Cartesian feedback power amplifier system , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[2]  Thomas H. Lee,et al.  Automatic phase alignment for high bandwidth Cartesian feedback power amplifiers , 2000, RAWCON 2000. 2000 IEEE Radio and Wireless Conference (Cat. No.00EX404).

[3]  Eisuke Fukuda,et al.  Cartesian feedback amplifier with soft landing , 1992, [1992 Proceedings] The Third IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[4]  James K. Roberge,et al.  Operational Amplifiers: Theory and Practice , 1975 .

[5]  David R. Cox.  Linear Amplification by Sampling Techniques: A New Application for Delta Coders , 1975, IEEE Trans. Commun..