Title :
A source-pull/load-pull measurement system including power amplifier linearization using simple instantaneous memoryless polynomial base-band predistortion
Author :
Abib, G.I. ; Bensmida, S. ; Bergeault, E. ; Huyart, B.
Author_Institution :
Departement COMELEC, Ecole Nationale Superieure des Telecommun., Paris
Abstract :
In this paper, an original measurement system for non-linear power characterization is presented. This set-up enables optimization of output power or power added efficiency (PAE) in conjunction with transistor´s linearization. The optimization of the fundamental impedances is performed using source-pull/load-pull measurements before a base-band predistortion is carried out. The linearization method for complex modulated carrier is based on the measurement of the instantaneous AM/AM characteristic and on the measurement of the AM/PM conversion. Therefore, an instantaneous memoryless polynomial base-band predistortion is obtained. Experimental results at 1.575 GHz for a commercial GaAs MESFET transistor biased in class AB show improvements equal to 15 dB and 5 dB for the C/I3 and ACPR values, respectively
Keywords :
UHF power amplifiers; UHF transistors; linearisation techniques; power measurement; 1.575 GHz; GaAs MESFET transistor; complex modulated carrier; instantaneous memoryless polynomial base-band predistortion; linearization method; nonlinear power characterization; power added efficiency; power amplifier linearization; source-pull/load-pull measurement system; Equations; Impedance; Linearization techniques; MESFETs; Polynomials; Power amplifiers; Power generation; Power measurement; Power transistors; Predistortion;
Conference_Titel :
Microwave Conference, 2006. 36th European
Conference_Location :
Manchester
Print_ISBN :
2-9600551-6-0
DOI :
10.1109/EUMC.2006.281285
