Analysis of envelope signal injection for improvement of RF amplifier intermodulation distortion

Author

Leung, Vincent W. ; Deng, Junxiong ; Gudem, Prasad S. ; Larson, Lawrence E.

Author_Institution

Center for Wireless Commun., Univ. of California San Diego, La Jolla, CA, USA

fYear

2004

fDate

3-6 Oct. 2004

Firstpage

133

Lastpage

136

Abstract

Adaptive bias techniques based on envelope signal power detection have been proposed for linearity enhancement and DC current reduction in RF amplifiers. Experimental results show an improvement in amplifier linearity, although asymmetric intermodulation distortion (IMD) was observed. This paper studies the effects of the magnitude and phase of the envelope signal injection on amplifier linearity, and illustrates a technique in which the IMD can be optimally cancelled.

Keywords

Volterra series; feedback amplifiers; intermodulation distortion; linearisation techniques; radiofrequency amplifiers; DC current reduction; IMD cancellation; Volterra series analysis; adaptive bias techniques; amplifier linearity; asymmetric intermodulation distortion reduction; envelope detector; envelope signal injection; envelope signal power detection; feedback network; high-efficiency RF amplifiers; high-linearity RF amplifiers; linearity enhancement; Circuits; Envelope detectors; Intermodulation distortion; Linearity; Power amplifiers; RF signals; Radio frequency; Radiofrequency amplifiers; Signal analysis; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004

Print_ISBN

0-7803-8495-4

Type

conf

DOI

10.1109/CICC.2004.1358755

Filename

1358755