A 2.5-GHz asymmetric multilevel outphasing power amplifier in 65-nm CMOS
Author(s)Godoy, Philip Andrew; Chung, SungWon; Barton, Taylor W.; Perreault, David J.; Dawson, Joel L.; Perron, J. Taylor; ... Show more Show less
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We present a high-efficiency transmitter based on asymmetric multilevel outphasing (AMO). AMO transmitters improve their efficiency over LINC (linear amplification using nonlinear components) transmitters by switching the output envelopes of the power amplifiers among a discrete set of levels. This minimizes the occurrence of large outphasing angles, reducing the energy lost in the power combiner. We demonstrate this concept with a 2.5-GHz, 20-dBm peak output power transmitter using 2-level AMO designed in a 65-nm CMOS process. To the authors' knowledge, this IC is the first integrated implementation of the AMO concept. At peak output power, the measured power-added efficiency is 27.8%. For a 16-QAM signal with 6.1dB peak-to-average power ratio, the AMO prototype improves the average efficiency from 4.7% to 10.0% compared to the standard LINC system.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Microsystems Technology Laboratories
Proceedings of the 2011 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications
Institute of Electrical and Electronics Engineers (IEEE)
Godoy, Philip A., SungWon Chung, Taylor W. Barton, David J. Perreault, and Joel L. Dawson. “A 2.5-GHz Asymmetric Multilevel Outphasing Power Amplifier in 65-Nm CMOS.” 2011 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (n.d.).
Author's final manuscript