Title :
Analog predistortion linearizer for high-power RF amplifiers
Author :
Yi, Jaehyok ; Yang, Youngoo ; Park, Myungkyu ; Kang, Wonwoo ; Kim, Bumman
Author_Institution :
Pohang Inst. of Sci. & Technol., South Korea
fDate :
12/1/2000 12:00:00 AM
Abstract :
We have developed an analog predistortion linearizer for a high-power amplifier of a code-division multiple-access (CDMA) base station. To effectively suppress the spectral regrowth in the adjacent channels, the odd-order intermodulation distortions (IMDs) should be cancelled. To accomplish this purpose, we employed a predistorter, which can cancel the third and fifth IMDs independently. The implemented predistorter linearized the RF amplifier with an average power of 45 dBm at 2.37-2.4-GHz band. A 9-dB suppression of spectral regrowth, from 33 to 42 dBc, was achieved for the CDMA signal with an 8.192-Mc/s chip rate over a 30-MHz bandwidth
Keywords :
MMIC power amplifiers; UHF integrated circuits; UHF power amplifiers; code division multiple access; intermodulation distortion; linearisation techniques; 2.37 to 2.4 GHz; 30 MHz; CDMA signal; adjacent channels; analog predistortion linearizer; chip rate; code-division multiple-access base station; high-power RF amplifiers; odd-order intermodulation distortions; spectral regrowth; Bandwidth; Base stations; High power amplifiers; Intermodulation distortion; Multiaccess communication; Phase measurement; Power amplifiers; Predistortion; Radio frequency; Radiofrequency amplifiers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
