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적응형 바이어스와 PBG를 이용한 Doherty 전력 증폭기 전력효율과 선형성 개선에 관한 연구
이왕열,서철헌,Lee Wang-Yeol,Seo Chul-Hun 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.8
본 논문에서는 적응형 바이어스와 PBG 구조를 이용하여 Doherty 증폭기의 효율 및 선형성을 개선하였다. PBG 구조를 출력 정합회로에 구현하였으며, 적응형 바이어스를 peaking amplifier에 적용하여 Doherty 증폭기의 효율뿐 아니라 선형성을 개선할 수 있었다. 제안된 구조를 이용한 Doherty 증폭기는 기존의 전력증폭기에 비해 PAE $12\%$, $IMD_3-7.5dBc$ 개선하였다. In this paper, adaptive bias circuit and PBG structure have been employed to suppress IMD(Inter-Modulation Distortion) and improve PAE(Power Added Efficiency) of the Doherty amplifier. Gate bias voltage has been controlled with the envelope of the input RF signal and PBG structure has been employed on the output port of Doherty amplifier. The proposed power amplifier using adaptive bias circuit and PBG has been improved the $IMD_3$ by 7.5 dBc, and the average PAR by $12\%$, respectively.
다물체 동역학해석을 이용한 자동차용 휠 베어링의 강도 해석
이승표(Seung-Pyo Lee),조영걸(Young-Geol Cho),장호섭(Ho-Seop Jang),김봉철(Bong-Chul Kim),이왕열(Wang-Yeol Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Automotive wheel bearing which transmits the power and supports the vehicle weight should satisfy the stress and strength conditions according to vehicle loadings, respectively. Among the several numerical methods, the conventional approach to check them is static analysis, which is not considered the effect of bearing rotation. In this paper, dynamic analysis is performed in order to predict the strength of automotive wheel bearing by using commercial software DAFUL. To verify the reliability of this study, the results are compared with those of conventional method which is calculated by MSC.MARC.