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RF Predistortion Techniques using 2nd Harmonics and Difference Frequency for Linearization of Power Amplifier  

박진상 (광운대학교 RFIC 센터)
조경준 (광운대학교 RFIC 센터)
장동희 (광운대학교 RFIC 센터)
김종헌 (광운대학교 RFIC 센터)
이병제 (광운대학교 RFIC 센터)
김남영 (광운대학교 RFIC 센터)
이종철 (광운대학교 RFIC 센터)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.4, 2003 , pp. 356-362 More about this Journal
Abstract
In this paper, we propose a predistortion technique which uses a novel combination of the second harmonic technique and the difference frequency technique to achieve independent control of the 3rd and 5th order intermodulation products generated by the PA. The second harmonic and difference frequency terms are generated using an envelope detector and two frequency multipliers. The RF predistorter has capability to independently control of the 3rd and 5th order intermodulation products so that high power amplifier is optimized for linear characteristics. From the measurement results, over the frequency band 2137.5 MHz to 2142.5 MHz, ACPR reduction of 11 dB is obtained for a single 30 dBm W-CDMA carrier.
Keywords
Difference Frequency; Intermodulation; Multiplier; Predistortion;
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