Title :
RF predistortion of power amplifiers using 2nd harmonic based technique for optimization of intermodulation products
Author :
Cho, K.J. ; Park, J.S. ; Kim, J.H. ; Lee, J.C. ; Lee, B.J. ; Kim, N.Y. ; Stapleton, S.P.
Author_Institution :
Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
An RF predistortion linearizer using a combination of a second harmonic and a difference frequency technique is proposed to reduce 3rd and 5th order intermodulation products in high power amplifiers. 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 a short delay line requirement. From the experimental results, adjacent channel power ratio (ACPR) reduction of 11 dB is achieved for W-CDMA at 2140 MHz.
Keywords :
UHF power amplifiers; code division multiple access; delay lines; frequency multipliers; harmonics; intermodulation distortion; linearisation techniques; mobile radio; 2140 MHz; 2nd harmonic based technique; IMD suppression; RF predistortion linearizer; W-CDMA; adjacent channel power ratio; delay line; difference frequency technique; envelope detector; frequency multipliers; insertion loss; intermodulation product optimization; mobile communication systems; power amplifiers; second harmonic based technique; Delay lines; Envelope detectors; High power amplifiers; Insertion loss; Multiaccess communication; Power amplifiers; Power system harmonics; Predistortion; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040419
