A Study of Digital Baseband Predistortion Technique for Linearizing RF Power Amplifiers

• Main Authors: Jr-yung Du, 杜至庸
• Other Authors: Tzyy-Sheng Horng
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/f7mu4e

碩士 === 國立中山大學 === 電機工程學系研究所 === 95 === This thesis presents a transmitter with digital baseband predistorter to improve linearity of power amplifier. The architecture adopts the look-up table predistorter base on a polar scheme, and realizes the digital processor using FPGA. The predistortion for AM/AM and AM/PM nonlinear relations in a 0.5μm GaAs pHEMT class-AB power amplifier has been performed. One-tone, two-tone and multi-tone continuous waves generated by baseband signal are used for linearity test. The results demonstrate that the digital predistortion technique can effectively improve intermodulation distortion. With this technique, the power amplifier can operate in the higher power range to achieve a similar linearity and a higher efficiency.