Optimum design of a predistortion RF power amplifier for multicarrier WCDMA applications
- Optimum design of a predistortion RF power amplifier for multicarrier WCDMA applications
- Cha, J; Yi, J; Kim, J; Kim, B
- Date Issued
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- 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-W peak envelope power. A simple third-order predistorter is used to measure the relative phases of the harmonics, as well as to linearize the amplifier. The performance of the optimized predistortion power amplifier is excellent for a IS-95 code-division-multiple-access signal. Finally, a method for reducing the memory effects of the amplifier is devised to get a good cancellation performance for a wide-band signal, and the performance degradation caused by the memory effects is analyzed. For a forward-link four-carrier WCDMA signal, the predistortion power amplifier delivers an adjacent channel leakage ratio of -46 dBc at a 4-W average output power with a cancellation of 13.4 dB.
- adjacent channel leakage ratio (ACLR); intermodulation (IM); linearity; memory effects; predistorter; power amplifier; wide-band code division multiple access (WCDMA); FEEDFORWARD AMPLIFIER; LINEARIZER; BAND
- Article Type
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 52, no. 2, page. 655 - 663, 2004-02
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