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http://dx.doi.org/10.6109/jkiice.2014.18.8.1847

High Efficiency Power Amplifier Based on Digital Pre-Distortion  

Kwon, Ki-Dae (R&D Center., FRTEK)
Yoon, Wonsik (Department of Electrical and Computer Eng., Ajou University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.18, no.8, 2014 , pp. 1847-1853 More about this Journal
Abstract
The PAPR of the input signal is increased due to OFDMA signal in a mobile communication system. High efficiency of a power amplifier, which accounts for power consumption, is a very important key technology. Digital Pre-Distortion techniques were used to improve the linearity of the power amplifier. The Asymmetric Doherty scheme was used to improve the efficiency of the power amplifier. In this paper, we propose a new structure of Asymmetric Doherty. Drive power amplifier part is separated as main path and peak path, and phase shifter is employed to improve power combine characteristics of the Doherty Amplifier. Also, envelope tracking technology for drive gate bais in drive peak amplifier is used to improve efficiency.
Keywords
Asymmetric Doherty; Digital Pre-Distortion; Power Amplifier; Envelope Tracking; Efficiency;
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