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Digital predistortion of envelope-tracking power amplifiers under average power back-off and long-term average power efficiency for base-station applications

Published online by Cambridge University Press:  18 February 2013

Jonmei J. Yan ,
Paul Draxler ,
Calogero D. Presti ,
Donald F. Kimball  and
Peter M. Asbeck
Jonmei J. Yan*
Affiliation:
ECE Department, University of California, San Diego, 9500 Gilman Dr. 0407, La Jolla, CA, USA MaXentric Technologies, La Jolla, CA, USA
Paul Draxler
Affiliation:
ECE Department, University of California, San Diego, 9500 Gilman Dr. 0407, La Jolla, CA, USA Qualcomm Inc., San Diego, CA, USA
Calogero D. Presti
Affiliation:
ECE Department, University of California, San Diego, 9500 Gilman Dr. 0407, La Jolla, CA, USA
Donald F. Kimball
Affiliation:
ECE Department, University of California, San Diego, 9500 Gilman Dr. 0407, La Jolla, CA, USA MaXentric Technologies, La Jolla, CA, USA
Peter M. Asbeck
Affiliation:
ECE Department, University of California, San Diego, 9500 Gilman Dr. 0407, La Jolla, CA, USA
*
Corresponding author: Jonmei J. Yan Email: [email protected]
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Abstract

In many base-station applications, the load/usage fluctuates over time periods of hours to days, thereby varying the required transmit power by as much as 10 dB. It is desirable to maintain high efficiency and linearity in the power amplifier under these back-off conditions in order to achieve high long-term efficiency. This paper demonstrates a scalable digital predistortion (DPD) approach that can be applied under different power back-off levels in envelope-tracking (ET) amplifiers and quantifies the associated efficiency. Efficiency comparisons are made with other amplifier configurations such as Class B and Doherty. Efficiency of 60% at full power (35 W average power) and >30% efficiency at 10 dB average power back-off are measured in an ET amplifier with a 7.54 dB peak-to-average ratio (PAPR) single-carrier WCDMA signal while meeting linearity specifications. Long-term base-station usage probability functions are presented. The long-term efficiency of the ET amplifiers is simulated to be greater than that of Class B and Doherty amplifiers.

Keywords

Power amplifiers and linearizersWireless systems and signal processing (SDR, MIMO, UWB.)
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Special Issue 2: Special Issue on Power Amplifier Linearization , April 2013 , pp. 171 - 177
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013

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References

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