Title :
Adaptive digital techniques for efficiency and linearity enhancement of CMOS RF power amplifiers
Author :
Kwon, Dae Hyun ; Li, Hao ; Chiu, Yun
Author_Institution :
Electr. & Comput. Eng. Dept, Univ. of Illinois at Urbana-Champaign, Urbana, IL
Abstract :
This paper presents a baseband adaptive digital compensation technique for cost-effective CMOS integration of next-generation OFDM wireless transmitters. High power efficiency and linearity are simultaneously achieved by using a class-B power amplifier (PA) with less back-off and treating the memoryless AM-AM and AM-PM distortions in the digital domain. When a 64-QAM OFDM signal is transmitted, computer simulations indicate that the post-compensation ACPR and EVM are improved by 13 dB and 30 dB, respectively. The average power efficiency of the PA is 10.9% as opposed to 3.2% of a class-A counterpart for typical usage patterns.
Keywords :
CMOS integrated circuits; OFDM modulation; power amplifiers; radio transmitters; radiofrequency amplifiers; 64-QAM OFDM signal; CMOS RF power amplifiers; adaptive digital techniques; baseband adaptive digital compensation technique; class-B power amplifier; cost-effective CMOS integration; efficiency enhancement; high power efficiency; high power linearity; linearity enhancement; memoryless AM-AM distortion; memoryless AM-PM distortion; next-generation OFDM wireless transmitters; Baseband; CMOS technology; Computer simulation; High power amplifiers; Linearity; OFDM; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Transmitters; ACPR; AM-AM; AM-PM; EVM; OFDM; RF power amplifier; adaptive digital filter; complex polynomial; linearization;
Conference_Titel :
VLSI Design, Automation and Test, 2008. VLSI-DAT 2008. IEEE International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4244-1616-5
Electronic_ISBN :
978-1-4244-1617-2
DOI :
10.1109/VDAT.2008.4542443
