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http://dx.doi.org/10.5515/KJKIEES.2007.18.7.839

Dual-Band Feedforward Linear Power Amplifier Using Equal Group Delay Signal Canceller  

Choi, Heung-Jae (Dept. of Information and Communication Engineering, Chonbuk National University)
Jeong, Yong-Chae (Dept. of Information and Communication Engineering, Chonbuk National University)
Kim, Hong-Gi (Sewon Teletech, Inc.)
Kim, Chul-Dong (Sewon Teletech, Inc.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.7, 2007 , pp. 839-846 More about this Journal
Abstract
In this paper, the first attempt to design a novel structure of dual-band feedforward linear power amplifier(FFW LPA) was presented. Up to now, primary technical difficulty has been the extension of the conventional signal canceller to the dual-band operation. Therefore, we propose the design technique of the dual-band equal group delayed carrier canceller, the dual-band equal group delayed intermodulation distortion(IMD) canceller and the dual-band FFW LPA. The operation frequency bands of the implemented dual-band FFW LPA are digital cellular($f_0=880$ MHz) and IMT-2000($f_0=2.14$ GHz) band, which are separated about 1.26 GHz. With the high power amplifier of 120 W PEP for commercial base-station application, IMD cancellation loop shows 20.45 dB and 25.04 dB loop suppression at each band of operation for 100 MHz. From the adjacent channel leakage ratio(ACLR) measurement with CDMA IS-95A 4FA and WCDMA 4FA signal, we obtained 16.52 dB improvement at the average output power of 41.5 dBm for digital cellular band, and 18.59 dB improvement at the average output power of 40 dBm for IMT-2000 band simultaneously.
Keywords
Dual-band; Feedforward; Power Amplifier;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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