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A Design of Predistortion Linearizer Using Second Harmonic Signals  

Kim Sung-Yong (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim Young (School of Electronics Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.12, 2005 , pp. 1239-1245 More about this Journal
Abstract
In this paper, a new predistortion linearizer using second harmonic components feedforwarding is proposed. The harmonic generator of the proposed predistorter that consists of a small signal amplifier extracts second harmonic signals. A vector modulator that modulate fundamental signal with second harmonic signals, generates the inverse third order intermodulation distortion signals and controls amplitude/phase of them with modulation factors. As a result, this linearizer is suppressed IMD3 signals of power amplifier effectively. The test results show that the third order IMD of power amplifier is suppressed more than 20 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio(ACPR) more than 5 dB for CDMA(IS-95) 4FA signals.
Keywords
Predistorter; Second Harmonic; Amplitude Modulator; Harmonic Generator; Power Amplifier;
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