Title :
High efficiency and wideband envelope tracking power amplifier with sweet spot tracking
Author :
Kim, Dongsu ; Choi, Jinsung ; Kang, Daehyun ; Kim, Bumman
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea
Abstract :
This paper describes the implementation of a high efficiency and wideband envelope tracking power amplifier with sweet spot tracking. By modulating supply voltage of power amplifier (PA), efficiency can be increased significantly. And linearity is improved by envelope shaping and sweet spot tracking. The supply modulator has a combined structure of a switching amplifier and a linear amplifier to achieve high efficiency as well as wide bandwidth. The measurement results show efficiencies of 36.4/34.1% for 10/20 MHz long term evolution (LTE) signals with peak to average power ratio (PAPR) of 7.5/7.42 dB.
Keywords :
CMOS integrated circuits; power amplifiers; envelope shaping; high efficiency power amplifier; long term evolution signals; peak to average power ratio; supply voltage modulation; sweet spot tracking; wideband envelope tracking power amplifier; Bandwidth; Broadband amplifiers; High power amplifiers; Linearity; Long Term Evolution; Peak to average power ratio; Power amplifiers; Power measurement; Power supplies; Voltage; Boost converter; envelope tracking; linear amplifier; long term evolution (LTE); power amplifier (PA); sweet spot; switching amplifier;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2010 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6240-7
DOI :
10.1109/RFIC.2010.5477260
