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http://dx.doi.org/10.5515/KJKIEES.2008.19.10.1096

Individual Order Intermodulation Distortion Generator Using Series Feedback of Diode and Its Application  

Son, Kang-Ho (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim, Seung-Hwan (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim, Ell-Kou (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim, Young (School of Electronics Engineering, Kumoh National Institute of Technology)
Yoon, Young-Chul (Electronics and Information Communication Engineering, Kwandong University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.10, 2008 , pp. 1096-1103 More about this Journal
Abstract
This paper proposes an individual order predistortion linearizer using intermodulation distortion(IMD) generator for cancellation the third and the fifth IMD of power amplifier. The IMD generator for controlling the third and the fifth IMD consist of common Emitter amplifier and Schottky diode. These signals are generated by series feedback of Schottky diode to obtain the inverse AM/AM and AM/PM characteristics of power amplifier. The individual order predistorters are consisted of individual IMD generator, power splitter and combiner. The test results show that the third and the fifth IMD can be improved by a maximum 13.5 dB and 0.9 dB in case of CW 2-tone signals. Also, the Adjacent Channel Leakage Ratio(ACLR) can be improved 2.3 dB, 2.5 dB at ${\pm}0.885$ MHz, ${\pm}1.23$ MHz offset frequency for CD-MA IS-95 2FA signals.
Keywords
Power Amplifier; AM/AM; AM/PM; Predistorter; Individual Order; Intermodulation Distortion;
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