Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Design of a PCS Band Linear Power Amplifier Using Feedforward Approach

피드포워드 방식을 이용한 PCS 대역 선형 증폭기의 설계

  • Kim Yoon-Ho (CHUNG--ANG University Electrical & Electronics Eng,) ;
  • Jeong Jai-Woong (CHUNG--ANG University Electrical & Electronics Eng,)
  • 김윤호 (중앙대학교 전기공학과 전력전자연구실) ;
  • 정재웅 (중앙대학교 전기공학과 전력전자연구실)
  • Published : 2001.07.01
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Abstract

For multi-carrier communication system, power amplifier generate intermodulation products caused by their nonlinear characteristics. Intermodulation products arised around the carrier frequency cannot be filtered out, operate as noise source for tile adjacent channel and thus degrades the quality of communication. In this paper, the 1850MHz-band RF linear power amplifier has been designed and fabricated with feedforward loop. The error signal loop consists of several key components such as phase shifter and attenuator, subtracter. The proposed Linearizer was tested with two-tone signals separated 10MHz apart at the center frequency of 1850MHz. The experimental results show C/I improvement by 14.5${\~}$20dB over 15dB dynamic range(33${\~}$47.8dBm) which gave IMD of 53.25${\~}$59dBc for the designed LPA.

Keywords