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A Novel Predistorter design using a Balanced Type IM3 Generator  

정형태 (서강대학교)
김상원 (서강대학교)
김철동 (세원텔레텍㈜)
장익수 (서강대학교)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.41, no.2, 2004 , pp. 65-70 More about this Journal
Abstract
This paper presents a novel linearization scheme for a nonlinear RF amplifier It is based on the amplitude modulation with envelope signal. The 3rd order distortion generator is composed of two FETs and it adopts a balanced structure for the purpose of main carrier cancellation. The amplitude and phase of the IM3 component can be controlled at RF band. This predistorter is implemented and tested at the KOREA PCS Tx. band (1840∼1870MHz). Experimental results of two-tone test show that the IM3 cancellation is achieved about 30-40 ㏈ for the wide dynamic range. The adjacent channel power ratio is improved by over 10 ㏈ at the broad-band CDMA signal with a peak to average power ratio of l0㏈, and this improvement is maintained through a wide range of output power levels.
Keywords
linearization; predistortion; power amplifier; envelope signal;
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  • Reference
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