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A Design of Predistorter for Controlling the Amplitude of Low-Frequency IM Signals  

Jang Mi-Ae (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.17, no.1, 2006 , pp. 45-51 More about this Journal
Abstract
In this paper, a new predistortion linearizer for controlling the amplitude of low frequency intermodulation distortion signals is proposed. The low frequency intermodulation distortion(IMD) components are generated by harmonic generator. A vector modulator, modulate fundamental signal with low frequency IMD signals, generates predistortion IMD signals and controls amplitude and phase of them with modulation factors. As a result, this predistorter is suppressed IMD signals of power amplifier effectively. The predistortion linearizer has been manufactured to operate in cellular base-station transmitting band($869{\sim}894\;MHz$). The experimental results show that IMD3 of power amplifier are improved more than 20 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio(ACPR) more than 10 dB for IS-95 CDMA IFA signals.
Keywords
Predistorter; Variable Gain Amplifier; Delay; AM-modulator; Power Amplifier;
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