前授型射頻功率放大器線性化技術與分析

• Main Author: 郭宏彬
• Other Authors: 楊水源
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/27434587787821355085

碩士 === 國防大學中正理工學院 === 電子工程研究所 === 90 === In this thesis, we used the software ADSRF/uw which was published by Agilent Technologies for construction of a feedforward RF power amplifier. We also found a way to design and to simulate a feed-forward RF power amplifier. To achieve the broadband property, we designed a feedforward system on the basis of loop stability. We then simulated the use of inputs of one-tone and two-tone tests in the band of IS-95 (CDMA) standard. Later, we analyzed the outcomes in both time as well as frequency domains. From the frequency domain up to 88dB, more or less, cancellation of hormonic distortion if achieved after a perfect feedforward linearization of a traditional non-linear RF power amplifier with one-tone testing imput. 88dB cancellation of third-order intermodulation distortion in-band is achieved with two-tone input also. Consideration of the non-linearity of an error amplifier in a feedforward stystem, we obtained the effect of a non-linear error amplifier on cancellation of hormonic distortion in a feedforward system by the variation of the IP3 of error amplification in the simulation, and it can be a reference of designing a feedforward power amplifier.