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A Design of Predistortion HPA using Frequency Up-Conversion Mixing Operation  

Jeong, Yong-Chae (Division of Electronic & Information Engineering, IDEC WG, Chonbuk National University)
Kim, Young (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim, Chul-Dong (Sewon Teletech, Inc.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.5, 2004 , pp. 480-485 More about this Journal
Abstract
In this paper, a new predistortion linearizing method using frequency up-conversion operation of mixer is proposed. This linearizing method doesn't require any additional signal sources in spite of frequency up-conversion mixing operation. This method extracts the 2nd low frequency intermodulation distortion signal from input signals and uses the extracted 2nd low frequency intermodulation distortion signal as mixing signal source. To show validation of the proposed predistortion method, we made K-PCS power amplifier. On 2-tone signals amplification process, the (C/I) ratio of amplifier is improved 26 ㏈ (@Po=22 ㏈m/tone), where two tones are 1.8544 ㎓ and 1.8556 ㎓, respectively. And (C/I) ratio is improved more than to 20 ㏈ for 17 ㏈ output signal dynamic range. On IS-95A CDMA 1FA amplification process, the improvements of adjacent channel power ratio(ACPR) are 10.8 ㏈ and 6.4 ㏈ at ${\pm}$885 ㎑ and ${\pm}$1.25 ㎒ offset points, respectively.
Keywords
Amplifier; Frequency Up-Conversion; Predistortion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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