Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Research on the Magnitude/Phase Asymmetry Measurement Technique of the RF Power Amplifier Based on the Predistortive Tone Cancellation Technique

  • Choi, Heung-Jae (Dept. of Electronics and Information Engineering, Chonbuk National University) ;
  • Shim, Sung-Un (Dept. of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim, Young-Gyu (Dept. of Electronics and Information Engineering, Chonbuk National University) ;
  • Jeong, Yong-Chae (Dept. of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim, Chul-Dong (Sewon Teletech, Inc.)
  • Received : 2010.05.20
  • Published : 2010.06.30
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Abstract

This paper proposes a novel memory effect measurement technique in RF power amplifiers(PAs) using a two-tone intermodulation distortion(IMD) signal with a very simple and intuitive algorithm. Based on the proposed predistortive tone cancellation technique, the proposed measurement method is capable of measuring the relative phase and magnitude of the third-order and fifth-order IMDs, as well as the fundamental signal. The measured relative phase between the higher and lower IMD signal for specific tone spacing can be interpreted as the group delay(GD) information of the IMD signal concerned. From the group delay analysis, we can conclude that an adaptive control of GD as well as the magnitude and phase is a key function in increasing the linearization bandwidth and the dynamic range in a predistortion(PD) technique.

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References

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