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http://dx.doi.org/10.5515/KJKIEES.2010.21.9.987

A Study on Efficiency Improvement of X-Band Power Amplifier Using Harmonic Control Circuit  

Kim, Hyoung-Jong (Department of Wireless Communications Engineering, Kwangwoon University)
Choi, Jin-Joo (Department of Wireless Communications Engineering, Kwangwoon University)
Kim, Dong-Yoon (LIGNex1 Co., Ltd.)
Na, Hyung-Gi (LIGNex1 Co., Ltd.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.9, 2010 , pp. 987-994 More about this Journal
Abstract
In this paper, a simple and effective active load-pull method is proposed, and the method to improve the efficiency of X-band power amplifier using harmonic control circuit is presented. The proposed active load-pull system mainly consists of directional coupler, phase shifter, short circuit, and power amplifier, and allows a user to access reflection coefficients near the edge of the Smith chart($\Gamma$=1) easily. The device used in this paper is Mitsubishi's GaAs FET MGF1801, and the operating frequency of the power amplifier is 9 GHz, The amplifier had output power of 21.65 dBm and drain efficiency of 24.9 % at class-A, and had output power of 21.46 dBm and drain efficiency of 53.3 % at class-AB. Harmonic control circuit is designed only second and third harmonic components because of the bandwidth limitation of the microwave components. The drain efficiency is improved as much as 6.4 % compared with class-AB power amplifier.
Keywords
Active Load-Pull; Harmonic Load-Pull; High Efficiency; Switching-Mode Amplifier;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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