Multi-level Out-Phasing Amplification Technology for  Enhancing Efficiency and Linearity of Linear Transmitter

김관우; Kyutae Lim; Joonhoi Hu; Jae Joon Kim; 변상진; Franklin Bien; Chang-Ho Lee

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자료유형: 학술저널

저자정보: 김관우 Kyutae Lim Joonhoi Hu Jae Joon Kim 변상진 Franklin Bien Chang-Ho Lee

저널정보: SK텔레콤 Telecommunications Review Telecommunications Review 제20권 제5호

발행연도: 2010.1

수록면: 791 - 808 (18page)

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There have been many efforts to improve efficiency of transmitter while meeting stringent linearity requirement of modern communication system. Among the technology to enhance efficiency of linear transmitter, the out-phasing technology, also called the linear amplification with nonlinear components (LINC), is considered as promising technology. LINC has been studied long time, since it provides excellent linearity with high efficiency by allowing adopt higg efficient switch-mode power amplifiers. In this paper, various state-of-art techniques for multi-level digital LINC transmitters are presented. For their all-digital implementation, flexible digital phase modulators (DPMs) are used to realize two RF phase input signals in LINC systems. An unbalanced phase calibration technique compensates amplitude/phase mismatches between two parallel paths in the LINC system, and an uneven multi-level LINC structure improves the overall power efficiency. The performance of multi-level LINC technology was experimentally verified for WiMAX signals.

#Linear amplification using nonlinear components #LINC) #out-phasing amplification #phase modulator #power amplifier #Multi-level

참고문헌 (20)

참고문헌 신청

/ 2005 / The IEEE 802.16 Working Group on Broadband Wireless Access Standards

A. V. Oppenheim / 1999 / Discrete-Time Signal Processing - Second Edition / Prentice Hall : 196 ~ 200

B. Stengel / 2000 / LINC Power Amplifier Combiner Method Efficiency Optimization / IEEE Trans. Veh. Technol 49 (1) : 229 ~ 234

C. Kromer / 2006 / A 25-Gb/s CDR in 90-nm CMOS for High-Density Interconnects / IEEE J. Solid- State Circuits 41 (12) : 2921 ~ 2929

D. C. Cox / 1974 / Linear Amplification with Nonlinear Components / IEEE Trans. Commun 22 : 1942 ~ 1945

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