Title :
Highly Efficient Dual-Switch Hybrid Switching Supply Modulator for Envelope Tracking Power Amplifier
Author :
Kim, Dongsu ; Kang, Daehyun ; Kim, Jooseung ; Cho, Yunsung ; Kim, Bumman
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol. (POSTECH), Pohang, South Korea
fDate :
6/1/2012 12:00:00 AM
Abstract :
This letter describes a highly efficient dual-switch hybrid switching supply modulator for an envelope tracking power amplifier (PA). The supply modulator has a combined structure of a linear amplifier and a switching amplifier. For an improved efficiency, the switching amplifier employs two buck converters and realizes an adaptive slew rate control of the switching amplifier´s current. An implemented envelope tracking PA delivers an efficiency of 39.1% at an output power of 27 dBm for long term evolution signal with 10 MHz channel bandwidth.
Keywords :
adaptive control; power amplifiers; power convertors; adaptive slew rate control; buck converters; envelope tracking power amplifier; frequency 10 MHz; high efficient dual-switch hybrid switching supply modulator; implemented envelope tracking PA; linear amplifier; long term evolution signal; Modulation; Peak to average power ratio; Power generation; Solid state circuits; Switches; Switching frequency; Buck converter; envelope tracking; long term evolution (LTE); power amplifier (PA); supply modulator;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2012.2197382
