Optimum Design of a Predistortion RFIEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 52, NO. 2, FEBRUARY 2004 655 Optimum Design of a Predistortion RF Power Amplifier for Multicarrier WCDMA Applications Jeonghyeon Cha, Jaehyok Yi, Jangheon Kim, and Bumman Kim, Senior Member, IEEE Abstract―This paper provides a design guide for optimum design of an RF power amplifier with a predistortion linearizer. For a two-tone signal, three performance degradation factors, higher order terms, amplitude, and phase mismatches are analyzed quantitatively. The results are implemented to the design of optimized predistortion power amplifier for a WCDMA signal application. For the experiments, a 2.4-GHz class-AB power amplifier is fabricated using an LDMOSFET with a 30……