Title :
Multi-order predistortion of power amplifiers using a second harmonic based technique
Author :
Cho, Kyoung-Joon ; Jang, Dong-Hee ; Kim, Sang-Hee ; Kim, Jong-Heon ; Lee, Byungje ; Kim, Nam-Young ; Lee, Jong-Chul ; Stapleton, Shawn P.
Author_Institution :
Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
A novel multi-order predistortion linearizer is proposed to achieve independent control of the third- and fifth-order intermodulation products in high power amplifier. The approach is based on a combination of the second harmonic technique and the difference frequency technique. The second harmonic and difference frequency terms are generated using an envelope detector and two frequency multipliers. The RF predistorter has the advantage of low insertion loss and the requirement of a short delay line. Experimental results demonstrate an adjacent channel power ratio (ACPR) reduction of 11 dB for W-CDMA, at 2140 MHz.
Keywords :
UHF frequency convertors; UHF integrated circuits; UHF power amplifiers; code division multiple access; frequency multipliers; intermodulation distortion; 2140 MHz; W-CDMA; adjacent channel power ratio; delay line; difference frequency technique; envelope detector; frequency multipliers; insertion loss; intermodulation products; multi-order predistortion; power amplifiers; second harmonic based technique; second harmonic technique; Band pass filters; High power amplifiers; Insertion loss; Power amplifiers; Power harmonic filters; Power system harmonics; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2003.815186
