Title :
A highly efficient SiGe differential power amplifier using an envelope-tracking technique for 3GPP LTE applications
Author :
Li, Yan ; Lopez, Jerry ; Lie, Donald Y C ; Chen, Kevin ; Wu, Stanley ; Yang, Tzu-Yin
Author_Institution :
Electr. & Comput. Eng. Dept., Texas Tech Univ., Lubbock, TX, USA
Abstract :
This paper presents a highly-efficient polar transmitter (TX) system that adopts the envelope-tacking (ET) technique with a differential SiGe power amplifier (PA) for 3GPP Long Term Evolution (LTE) applications. The differential PA was designed using a cascode topology, reaching power-added efficiency (PAE) of 50% at output power of 22dBm in continuous wave (CW) mode. The experimental data also shows that the proposed ET-based polar TX system with the cascode PA delivers 21dBm average output power with 33.6% PAE at 1.42 GHz, while also meeting the LTE 16QAM linearity specs for both error vector magnitude (EVM) and TX emission mask without the need of PA predistortion.
Keywords :
3G mobile communication; Long Term Evolution; differential amplifiers; power amplifiers; 3GPP LTE application; 3GPP long term evolution; cascode topology; continuous wave mode; differential PA; differential SiGe power amplifier; envelope tracking technique; envelope-tacking technique; highly efficient SiGe differential power amplifier; highly-efficient polar transmitter system; power-added efficiency; Gain; Linearity; Modulation; Power amplifiers; Power generation; Silicon germanium; Transmitters; Differential Cascode Power Amplifier (PA); SiGe PA; envelope amplifier; envelope-tracking (ET); linearity; power-added efficiency (PAE);
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), 2010 IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-8578-9
DOI :
10.1109/BIPOL.2010.5667924
