Title :
An analog compensation method for asymmetric IMD characteristics of a power amplifier
Author :
Cho, K.J. ; Choi, J.C. ; Kim, J.H. ; Lee, B.J. ; Kim, N.Y. ; Lee, J.C. ; Stapleton, S.P.
Author_Institution :
Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
The modulation frequency affects the asymmetric intermodulation distortion (IMD) products of a RF power amplifier. This effect reduces IMD cancellation performance of power amplifiers in connection with predistortion linearization. A phase extraction method to determine phase difference between upper and lower 3/sup rd/ order IMD products and a phase compensation circuit using an envelope injection technique is proposed. The experimental results demonstrate a significant improvement in the 3/sup rd/ order IMD cancellation performance.
Keywords :
compensation; intermodulation distortion; power amplifiers; radiofrequency amplifiers; IMD cancellation; RF power amplifier; analog phase compensation circuit; asymmetric intermodulation distortion; envelope injection; modulation frequency dependence; phase extraction; predistortion linearization; Circuits; Data mining; Frequency dependence; Frequency modulation; Intermodulation distortion; Power amplifiers; Power engineering and energy; Predistortion; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1212617
