Title :
An analog compensation method for asymmetric IMD characteristics of power amplifier
Author :
Cho, Kyoung-Joon ; Jang, Dong-Hee ; Kim, Sang-Hee ; Kim, Ji-Yeon ; Kim, Jong-Heon ; Stapleton, Shawn P.
Author_Institution :
Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea
fDate :
4/1/2004 12:00:00 AM
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 third-order IMD products and a phase compensation circuit using an envelope injection technique is proposed. The experimental results demonstrate a significant improvement in the third-order IMD cancellation performance.
Keywords :
MMIC power amplifiers; compensation; intermodulation distortion; radiofrequency amplifiers; IMD cancellation; RF amplifier; analog compensation; asymmetric IMD characteristics; envelope injection; intermodulation distortion; modulation frequency; phase compensation circuit; phase difference; phase extraction; power amplifier; predistortion linearization; third-order IMD; Broadband amplifiers; Circuits; Data mining; Frequency dependence; Frequency modulation; Phase measurement; Power amplifiers; Predistortion; Radio frequency; Radiofrequency amplifiers;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.827117
