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Application of Feed-forward Linearization Method to A Transmitter System  

김경태 (경원대학교 전자 전기정보공학부)
김상규 (경원대학교 대학원 전자공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.23, no.4, 2004 , pp. 303-308 More about this Journal
Abstract
In this Paper a transmitter system for IMr-2000 using feed-forward linearization method was Proposed to linearize power amplifier. The feed-forward structure needs a reference signal to compare and neutralize distortion : this is achieved through the second modulator which is operated at very low input level to obtain a signal with a negligible distortion. Therefore, this structure can reduce distortion of modulator as well as Power amplifier. This is the advantage over the existing system structure. The Proposed transmitter system is designed and simulated by Agilent ADS ver.2002. A two tone test for the system is done at 1.98GHz center frequency with frequency spacing of 2MHz. The reduction of Inter-Modulation Distortion(IMD) is around 49.95dB. This proposed system offers an excellent combination of linearity and simplicity.
Keywords
Feed-forward; Amplifier; Linearization;
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