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http://dx.doi.org/10.5515/KJKIEES.2007.18.11.1262

A Research on a Cross Post-Distortion Balanced Linear Power Amplifier for Base-Station  

Choi, Heung-Jae (Dept. of Info. & Comm. Engineering, Chonbuk National University (IDEC WG))
Jeong, Hee-Young (Airpoint Co., Ltd.)
Jeong, Yong-Chae (Dept. of Info. & Comm. Engineering, Chonbuk National University (IDEC WG))
Kim, Chul-Dong (Sewon Teletech, Inc.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.11, 2007 , pp. 1262-1270 More about this Journal
Abstract
In this paper, we propose a new distortion cancellation mechanism for a balanced power amplifier structure using the carrier cancellation loop of a feedforward and post-distortion technique. The proposed cross post-distortion balanced linear amplifier can reduce nonlinear components as much as the conventional feedforward amplifier through the output dynamic range and broad bandwidth. Also the proposed system provides higher efficiency than the feedforward. The capacities of power amplifier and error power amplifier in the proposed system are analyzed and compared with those of feedforward amplifier. Also the operation mechanisms of the three kind loops are explained. The proposed cross post-distortion balanced linear power amplifier is implemented at the IMT-2000($f_0=2.14\;GHz$) band. With the commercial high power amplifiers of total power of 240 W peak envelope power fer base-station application, the adjacent channel leakage ratio measurement with wideband code division multiple access 4FA signal shows 18.6 dB improvement at an average output power of 40 dBm. The efficiency of fabricated amplifier Improves about 2 % than the conventional feedforward amplifier.
Keywords
Balanced Amplifier; Feedforward; Post-Distortion; Base-Station;
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