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The Design of Predistortion Linearizer using the Low Frequency Intermodulation Terms of Harmonic Generator  

Kim, Young (Dept. of Electronics Engineering, Sogang University)
Chang, Ik-Soo (Dept. of Electronics Engineering, Sogang University)
Jang, Hyung-Soon (Dept. of Electronics Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.39, no.9, 2002 , pp. 28-34 More about this Journal
Abstract
In this paper, a new type predistorter using a low frequency intermodulation signals terms of harmonic generator is proposed. A vector modulator, in which fundamental signal is modulated with low frequency intermodulation signals derived from harmonic generator, generates predistorted third and fifth IM components. Using predistorted signals, intermodulation distortion signals of power amplifier suppressed. The suggested predistorter has been manufactured to operate in Korean PCS base-station transmitting band (1840~1870MHz). The test results show that the third IMD signal level is reduced more than 20dB and the fifth IMD signal is reduced about 10dB for CW two-tone signals. The predistorter improves the Adjacent Channel Power Ratio (ACPR) more than 10dB for CDMA (IS-95) signals.
Keywords
Predistorter; Linearizer; Vector Modulator; Power Amplifier; Harmonic Generator;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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