대한전자공학회:학술대회논문집 (Proceedings of the IEEK Conference)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

위상조절 왜곡기발생기를 가진 아날로그 전치왜곡기를 이용한 Doherty Amplifier의 선형성 개선

Linearity Improvement of Doherty Amplifier Using Analog Predistorter with Phase-Controlled Error Generator

  • 이용섭 (포항공과대학교 전자전기공학과) ;
  • 정윤하 (포항공과대학교 전자전기공학과)
  • Lee, Yong-Sub (Department of Electronic and Electrical Engineering Pohang University of Science and Technology) ;
  • Jeong, Yoon-Ha (Department of Electronic and Electrical Engineering Pohang University of Science and Technology)
  • 발행 : 2006.06.21
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초록

This paper represents a Doherty amplifier with analog predistorter to improve the linearity of the Doherty amplifier while preserving the high efficiency. A $3^{rd}$-order predistorter cancels $5^{th}$-order intermodulation (IM5) as well as $3^{rd}$-order intermodulation (IM3) components by their same phase difference in the predistorter and Doherty amplifier. This is accomplished by independently controlling their phase by using the phase-controlled error generator in the predistorter. For experimental verification, a $3^{rd}$-order predistorter has been implemented and tested in a 180-W Doherty amplifier at the wide-band code division multiple access (WCDMA) band. The measured results show good performance with the predistortion Doherty amplifier.

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