Title :
High efficiency envelope tracking power amplifier with very low quiescent power for 20 MHz LTE
Author :
Hassan, Muhammad ; Kwak, Myoungbo ; Leung, Vincent W. ; Hsia, Chin ; Yan, Jonmei J. ; Kimball, Donald F. ; Larson, Lawrence E. ; Asbeck, Peter M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA
Abstract :
A high efficiency wideband envelope tracking power amplifier with low quiescent power is presented. The CMOS envelope amplifier has a combined linear amplifier and switching amplifier to achieve high efficiency and wider bandwidth. Quiescent power of the envelope amplifier is reduced using a source cross-coupled linear amplifier with inherently low DC power dissipation. Measurements show a power added efficiency of 45% for the envelope tracking power amplifier for 20 MHz LTE signal with 6.0 dB PAPR at 2.5 GHz at 1 W output power.
Keywords :
CMOS integrated circuits; Long Term Evolution; low-power electronics; power amplifiers; CMOS envelope amplifier; LTE; efficiency 45 percent; frequency 2.5 GHz; frequency 20 MHz; high efficiency wideband envelope tracking power amplifier; power 1 W; source cross-coupled linear amplifier; switching amplifier; very low quiescent power; Distortion measurement; Peak to average power ratio; Power amplifiers; Radio frequency; Switches; Wideband; Envelope tracking (ET); long term evolution (LTE); power amplifier (PA); supply modulator;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2011 IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-8293-1
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2011.5940618
