Title :
Cross Cancellation TechniqueEmploying an Error Amplifier
Author :
Choi, Heungjae ; Jeong, Yongchae ; Kenney, J. Stevenson ; Kim, Chul Dong
Author_Institution :
Dept. of Inf. & Commun. Eng. & IDEC WG, Chonbuk Nat. Univ., Jeonju
fDate :
7/1/2008 12:00:00 AM
Abstract :
In this letter, we propose a new distortion cancellation mechanism for a balanced power amplifier (PA) structure using the cross cancellation technique employing an error amplifier. The proposed cross cancellation balanced linear PA is implemented in the IMT-2000 ( 2.14GHz) band. With commercial PAs with a peak power of 240 W for base-station application, the proposed system shows 18.6 dB improvement at an average output power of 40 dBm for adjacent channel leakage ratio measurement with wideband code division multiple access 4FA signal. The efficiency of the proposed structure is about 2% higher than the conventional feedforward amplifier for modulated carrier.
Keywords :
3G mobile communication; UHF power amplifiers; code division multiple access; distortion; IMT-2000; balanced power amplifier; cross cancellation; distortion cancellation; error amplifier; feedforward amplifier; frequency 2.14 GHz; linear power amplifier; wideband code division multiple access; Balanced power amplifier (BPA); cross cancellation; feedforward technique (FFW); linearization;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.925098
