Title :
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
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;
Conference_Titel :
Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004
Print_ISBN :
0-7803-8495-4
DOI :
10.1109/CICC.2004.1358755
