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A study on the high power amplifier Distortion analysis and Improving  

Ha, Sung-Jae (삼성탈레스)
Hong, Ui-Seok (광운대학교 전파공학과 초고주파연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.10A, 2007 , pp. 1072-1077 More about this Journal
Abstract
In this paper, a power amplifier intermodulation distortion has been analyzed to improve linearity and the analysis results are used to minimize the distortion for linear power amplifier design. The proposed design technique is which the intermodulation distortions of the final amplifier are removed by driver intermodulation distortions. This proposed technique is based on AM to AM distortion analysis using power series, and AM to PM distortion analysis results using Bessel function. To verify this technique implement a cellular HPA(High Power Amplifier) 30W. From the results of the implementation and measurement for the linear power amplifier, the spurious characteristic is shown as 50 dBc at 1.98 MHz with 30 W with 20FA. These results show that distortion characteristics are improved as much as 10 dB in spurious characteristic compared with conventional design method.
Keywords
HPA; Linearlty; AM to AM; AM to PM;
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