Volterra characterization and predistortion linearization of multi-carrier power ampliflers

The linearization of RF power amplifiers (PA) can benefit from the availability of the generalized Volterra coeflicients characterizing its non-linear response. In this work a large-signal network analyzer is used to acquire the amplitude and phase of the 3rd intermodulation terms Y m3- and Y m3+ of...

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Bibliographic Details
Main Authors: Suk Keun Myoung, Chaillot, D., Roblin, P., Wenhua Dai, Seok Joo Doo
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Frequency dependence
Large-signd network analyzer (LSNA)
memory effects
Multiaccess communication
Nonlinear distortion
Performance analysis
Power amplifiers
Predistortion
predistortion linearization
Radio frequency
radio frequency power amplifrer (RF PA)
Radiofrequency amplifiers
Signal analysis
Volterra series
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Summary:The linearization of RF power amplifiers (PA) can benefit from the availability of the generalized Volterra coeflicients characterizing its non-linear response. In this work a large-signal network analyzer is used to acquire the amplitude and phase of the 3rd intermodulation terms Y m3- and Y m3+ of an LDMOSFET PA. The frequency dependence and difference between Y m3- and Y m3+ reveals the memory effects of the RF amplifier. A new vectorial digital predistortion linearization with 3rd and 5th order corrections is implemented to account for the difference in memory effits in the lower and upper side bands. The two band predistortion . linearization can linearize independently each band of a 2-carrier WCDMA in a LDMOSFET RF amplifier providing up to 40 dBc ACPR. The extension from 2-carrier to multi-carrier power amplifiers could proceed by further dividing the bandwidth in additional bands.
DOI:10.1109/ARFTGF.2004.1427572