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The Design of Predistortion Linearizer with Polar Function Generator for Cellular Band Using Even Order Harmonic Signals  

Kim, Ell-Kou (School of Electronics Engineering, Kumoh National Institute of Technology)
Jeon, Ki-Kyoung (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim, Young (School of Electronics Engineering, Kumoh National Institute of Technology)
Kwon, Sang-Keun (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.17, no.11, 2006 , pp. 1050-1057 More about this Journal
Abstract
This paper proposes a new predistortion linearizer with amplitude modulator and PFG(Polar Function Generator) using second order harmonic signals. This linearizer consists of PFG that combine with in-phase and quadrature-phase of second harmonic signals and amplitude modulator in main path. The predistorted third order intermodulation distortion(IMD3) signals that are generated by amplitude modulator with fundamental and PFG signals, improve a amplifier nonlinear characteristics. The proposed linearizer and amplifier have been manufactured and tested to operate in cellular base-station transmitting band$(869\sim894MHz)$. The test results show that IMD3 can be removed by more than 22.5 dB in case of CW 2-tone signals ${\Delta}f=1$ MHz, and the adjacent channel power ratio(ACPR) also can be improved by more than 8.4 dB for CDMA IS-95 1FA signals.
Keywords
Polar Function Generator; Predistortion; Power Amplifier; Second Harmonic Signal;
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