Affiliation:
1. Innovation Center of Advanced Technologies, Niš
2. Faculty of Electronic Engineering, Niš
Abstract
This paper represents the linearization of the RF power amplifier performed
by a new approach that combines two different methods exploiting the modified
baseband signals. The signals for linearization in both methods are formed
and processed in digital domain. The required modified baseband signals for
linearization are products of the second order nonlinearity of a nonlinear
system fed by the useful baseband signal. In the first method, adequate part
of the modified baseband signal is adjusted in amplitude and polarity and
injected at the input and output of the amplifier transistor across the
series LC resonant circuit. In the second method, the appropriate modified
baseband signal set on the appropriate amplitude and phase modulates the
fundamental carrier second harmonic, which is then inserted at the input and
output of the amplifier transistor. The effects of the combined linearization
method are considered on a single stage power amplifier for quadrature
amplitude modulated signals characterized with frequency spacing between
spectral components up to 60 MHz for different input power levels, as well as
for WCDMA digitally modulated signal.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Cited by
6 articles.
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