Design and Fabriaction of a Power Amplifier and Its Linearizer Using Analog Predistortion Method

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Faghihi, Ehsan | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43490 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Banai, Ali
Abstract:
Modern communication systems,while demanding high power efficiency, suffer from the inherent nonlinearty effects. Such a problem becomes more critical in LEO satellites, in which there are fundamental power limitations. Considering that the main source of nonlinear effects are power amplifiers, one of the most common methods to improve signal quality in a transmitter, meanwhile maintaining power efficiency, is to utilize linearization techniques for power amplifiers. This project consists of two parts. The first is to design and fabricate a power amplifier for the desired frequency (2.4 GHz) and power requirements (3 W). The other is design and fabrication of a linearizer and matching it to the power amplifier characteristics. For linearization, the analog predistortion technique is applied, which could be simpler, smaller, less expensive and less power consuming, than similar digital approaches. The power amplifier along with the linearizer blockhave been designed, fabricated and tested using 1-tone and 2-tone tests.
Keywords:
Power Amplifier ; Predistortion ; Linearizer Amplifier ; Intermodulation Distortion ; Two-Tone Test

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