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J. Electromagn. Eng. Sci > Volume 10(2); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(2):73-78.
DOI: https://doi.org/10.5515/JKIEES.2010.10.2.073   
A Research on the Magnitude/Phase Asymmetry Measurement Technique of the RF Power Amplifier Based on the Predistortive Tone Cancellation Technique
Heung-Jae Choi1, Sung-Un Shim1, Young-Gyu Kim1, Yong-Chae Jeong1, Chul-Dong Kim2
1Dept. of Electronics and Information Engineering, Chonbuk National University
2Sewon Teletech, Inc.
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.
Key words: Intermodulation Distortion, Linearization, Memory Effect, Predistortion
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