A Study on Improvement of Linearity and Efficiency Compensation in a Doherty Power Amplifier

Doherty 전력증폭기의 선형성 개선과 효율 보상 방안에 관한 연구

  • 장정석 (광운대학교 전파 공학과) ;
  • 도지훈 (광운대학교 전파 공학과) ;
  • 윤호석 (광운대학교 전파 공학과) ;
  • 김대희 (광운대학교 전파 공학과)
  • Published : 2009.04.30

Abstract

This paper proposes a method which increases the linearity using an improvement mechanism of Doherty power amplifier and compensates the decrement of efficiency due to improvement of linearity. To verify the method, a 20W power amplifier is designed and implemented. Compared with 2-way Doherty power amplifier, the implemented 3-way Doherty power amplifier with class F shows improved linearity about 10dBc and efficiency about 1.5%. Also, efficiency characteristic has been improved about 3.5% compared with the 2-way Doherty power amplifier while maintaining linearity. This results show that the proposed 3-way Doherty power amplifier with class F is shown to be adequate for improvement of efficiency and linearity. It is expected that the proposed amplifier can be used for various wireless communication system amplifiers.

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