Title :
Emerging multi-level architectures and unbalanced mismatch calibration technique for high-efficient and high-linear LINC systems
Author :
Laskar, J. ; Lim, K. ; Hur, J. ; Kim, K.W. ; Lee, O. ; Lee, C.-H.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
May 30 2010-June 2 2010
Abstract :
Linear amplification with nonlinear components (LINC) provide excellent linearity with high efficiency by adopting switch mode power amplifiers. One of the issues regarding LINC is the efficiency degradation due to wasted power at the power combiner when phase difference is large. In this paper, two efficiency enhancement architectures are presented: multi-level LINC (MLINC) architecture improves transmitter efficiency compared to a conventional LINC system, and the proposed uneven multi-level LINC (UMLINC) can further improve the efficiency. Another problem of LINC is the amplitude and phase mismatches between the two signal paths degrading the linearity performance. To address the problem, an unbalanced mismatch calibration technique for the proposed LINC system is introduced.
Keywords :
OFDM modulation; carrier transmission on power lines; power amplifiers; power combiners; quadrature amplitude modulation; switched mode power supplies; high linear LINC system; linear amplification; multilevel LINC architectures; nonlinear component; phase difference; switch mode power amplifiers; unbalanced mismatch calibration technique; Calibration; Degradation; High power amplifiers; Linearity; Peak to average power ratio; Power combiners; Power supplies; Signal generators; Switches; Transmitters;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537441
