Browse > Article

A Design of Analog Predistortion Linearizer Using Even Harmonic Signals  

Hwang Moon-Soo (School of Electronics Engineering, Kumoh National Institute of Technology)
Jeon Ki-Kyung (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim Ell-Kou (School of Electronics Engineering, Kumoh National Institute of Technology)
Cho Suk-Hui (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim Young (School of Electronics Engineering, Kumoh National Institute of Technology)
Kim Byung-Chul (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. 67-73 More about this Journal
Abstract
This paper proposes a new predistortion linearizer with controlling intermodulation distortion(IMD) signals. This linearizer achieves independent control of third- and fifth-order intermodulation distortion products using amplitude modulation with even harmonic signals. A vector modulator that modulate fundamental signal with both second- and fourth-order harmonic components generated by harmonic generator circuits, generates the inverse characteristics third-and fifth-order intermodulation signals of power amplifier and controls amplitude and phase of them with each other modulation factors. As a results, this linearizer is suppressed IMD signals of power amplifier effectively. The test results show that the third IMD is cancelled more than 25 dB and the fifth order IMD is cancelled about 18 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio(ACPR) more than 7 dB for IS-95 CDMA signals.
Keywords
Predistortion; Even Harmonic; Amplitude Modulator; Intermodulation Distortion;
Citations & Related Records
연도 인용수 순위
  • Reference
1 C. S. Aitchison, 'The current status of RF and microwave amplifier intermodulation performance', MA, pp. 113-116, Jun. 2000
2 S. C. Cripps, RF Power Amplifiers for Wireless Communications, Norwood, MA, Artech House, 1999
3 C. S. Aitchison, M. Mbabele, M. R. Moazzam, D. Budimir, and F. Ali, 'Improvement of third-order intermodulation product of RF and microwave amplifiers by injection', IEEE Trans. Microwave Theory Tech., vol. 49, no. 6, pp. 1148-1154, Jun. 2001   DOI   ScienceOn
4 Y. Kim, I. -S. Chang, and Y.- C Jeong, 'An analog predistortion linearizer design', Microwave Journal, vol. 48, no. 2, pp. 118-126, Feb. 2005
5 P. B. Kenington, High-Linearity RF Amplifier Design, Norwood, MA, Artech House, 2000
6 S. -Y. Kim, M. -A. Jang, K. -K. Jeon, Y. Kim, and Y. -C. Jeong, 'An analog linearizer using second harmonic IEEE Radio Freq. Integrated Circuits Symp., Boston, signals feedforwarding', European Microwave Conference 2005, Sep. 2005
7 Tri T. Ha, Solid-State Microwave Amplifier Design, John Wiley, 1981
8 T. Nesimouglu, D. Budimir, M. R. Moazzam, and C. S. Aitchison, 'Second harmonic injecting technique for low intermodulation RF-microwave amplifiers', High Frequency Postgraduate Student Colloquim, pp. 143-148, Sep. 1997