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

fYear

2007

Firstpage

388

Lastpage

391

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ECCTD.2007.4529614

Filename

4529614