The Transactions of the Korean Institute of Electrical Engineers D (대한전기학회논문지:시스템및제어부문D)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

A Design of Predistorter for Independently Controllable AM/AM and AM/PM of High Power Amplifier for the Communication Systems

통신용 대전력증폭기의 AM/AM과 AM/PM을 독립적으로 제어하는 전치왜곡보상기 설계

  • 원용규 (서울정보기능대학 전기계측제어과) ;
  • 정찬수 (숭실대학 전기공학과)
  • Published : 2004.03.01
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Abstract

Amplifier linearity plays a major role in the quality of mordern communication systems. The Power amplifier should be operated near saturation region to achieve high efficiency But at this region amplitude and phase distortions of the amplifier remarkably increase with the input power increase and cause a significant adjacent channel interference. In this paper, an independently controllable AM/AM and AM/PM predistortion linearizers consisted of two bias feed resistance linearizers is proposed. This linearizer allows independent adjustment of the AM/AM and AM/PM curves by using two adjustable voltages to compensate tile power amplifier non-linearities. The predistortion linearizer can improve the ACPR by 5.3dB with cdma2000 multi carrier signals. And by applying this linearizer to two-tone(880MHz) power amplifier, third order IMD products are improved up to 8(dB).

Keywords

References

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