Title :
Switched mode power amplifier linearization using digital predistortion
Author :
Rahman, Muhammed Tahsin ; Albasha, Lutfi ; Mir, Hasan
Author_Institution :
Dept. of Electr. Eng., American Univ. of Sharjah, Sharjah, United Arab Emirates
Abstract :
This paper proposes the realization of a three box parallel nonlinear model for predistorting a switched mode power amplifier (PA). Such amplifiers are highly efficient but exhibit very strong nonlinear effects, and this constraint has considerably limited their use. Through the implementation of accurate models as the predistorter, the nonlinearity inherent in the switched mode power amplifier can be compensated for. Driven by a wideband signal, simulations show that the model used achieves an improvement of 1.224dB in the adjacent channel power ratio (ACPR). Overall, the PA maintains 71.3% power added efficiency (PAE), a significant increase over other classes.
Keywords :
linearisation techniques; nonlinear network analysis; power amplifiers; ACPR; adjacent channel power ratio; digital predistortion; efficiency 71.3 percent; nonlinear effect; power added efficiency; switched mode power amplifier linearization; three box parallel nonlinear model; wideband signal; Adaptation models; Computational modeling; Mathematical model; Nonlinear distortion; Polynomials; Predistortion; Class E; digital predistorter; linearity; memory effect; nonlinearity; power amplifier; predistortion; switched mode;
Conference_Titel :
Microwave Symposium (MMS), 2014 14th Mediterranean
Print_ISBN :
978-1-4799-7390-3
DOI :
10.1109/MMS.2014.7088914
