Title :
Performance of adaptive predistortion temperature in RF power amplifier linearization
Author :
He, Holly Q. ; Faulkner, Mike
Author_Institution :
Sch. of Commun. & Inf., Victoria Univ. of Technol., Melbourne, Vic., Australia
Abstract :
The input-output AM/AM and AM/PM characteristics of an RF power amplifier varies with junction temperature. A thermal model of a power amplifier (PA) is built by using thermal impedance curves of a power transistor. Based on this model, the dynamic performance of a PA is simulated under different input signal conditions, with and without predistortion. It is shown that variations in junction temperature due to input signal modulation have an insignificant effect on the performance of predistortion linearization, but variations due to longer term average power dissipation degrade the performance and must be tracked
Keywords :
amplitude modulation; circuit simulation; electric distortion; linearisation techniques; phase modulation; power amplifiers; power transistors; radiofrequency amplifiers; temperature; thermal analysis; RF power amplifier; RF power amplifier linearization; adaptive predistortion temperature; average power dissipation; dynamic performance; input signal conditions; input signal modulation; input-output AM/AM characteristics; input-output AM/PM characteristics; junction temperature; power transistor; predistortion linearization; simulation; thermal impedance curves; thermal model; Australia; Impedance; Power amplifiers; Power dissipation; Predistortion; Radio frequency; Radiofrequency amplifiers; Signal processing; Temperature; Thermal resistance;
Conference_Titel :
Signal Processing and Its Applications, 1999. ISSPA '99. Proceedings of the Fifth International Symposium on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
1-86435-451-8
DOI :
10.1109/ISSPA.1999.815772
