Title :
Envelope tracking power amplifier with static predistortion linearization
Author :
Harju, Henri ; Rautio, Timo ; Hietakangas, Simo ; Rahkonen, Timo
Author_Institution :
Dept. of Electr. & Inf. Eng., Univ. of Oulu, Oulu
Abstract :
An efficiency enhanced power amplifier is presented. The amplifier uses envelope tracking (ET) technique and static predistortion to achieve high linearity. The effects of drain voltage modulation to experimental amplifier´s gain, phase as well as bandwidth are measured using simple single-tone tests and discussed. Then the amplifier´s ET performance is evaluated. The complete envelope tracking system uses 16 QAM modulated 1 MHz bandwidth signals. The amplifier´s single-tone power added efficiency (PAE) was measured to be 38% with 20 dBm output power and average PAE for 16 QAM was 39% with average output power of 20 dBm. The amplifier achieved roughly 25 dBc ACPR, which improved to roughly 50 dBc after adding predistortion.
Keywords :
distortion; power amplifiers; quadrature amplitude modulation; bandwidth 1 MHz; drain voltage modulation; envelope tracking power amplifier; quadrature amplitude modulation; static predistortion linearization; Bandwidth; Gain measurement; Linearity; Phase measurement; Phase modulation; Power amplifiers; Power generation; Predistortion; Quadrature amplitude modulation; Voltage; Envelope tracking (ET); power amplifier; predistortion;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529614
