Supply Modulation of a Linear Doherty Power Amplifier
Paper in proceeding, 2018
This paper presents a study of supply modulation of a Doherty power amplifier (DPA) designed for linear operation. The symmetrical DPA is designed with Wolfspeed 6-W packaged devices for operation at 3.5 GHz with a peak output power of 42dBm and a peak power-added efficiency (PAE) of 55%. Supply modulation is characterized statically when the main and auxiliary amplifier supply voltages are modulated separately, as well as simultaneously. The DPA is then characterized with 60-MHz LTE-like signals with 6 dB and 10 dB peak-to-average power ratios (PAPR). After digital pre-distortion using an iterative learning control algorithm, the composite PAE for a 10-dB PAPR signal is 38.7%, with mean-square error (NMSE) and ACLR values of 0.3% and -47 dBc.
envelope tracking
predistortion
supply modulation
power-dac
power amplifiers
Doherty amplifier
Author
Dan Fishler
University of Colorado
Tommaso Cappello
University of Colorado
William Hallberg
Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics
Taylor Barton
University of Colorado
Zoya Popovic
University of Colorado
2018 48th European Microwave Conference, EuMC 2018
519-522 8541618
978-287487051-4 (ISBN)
48th European Microwave Conference, EuMC 2018
Madrid, Spain,
Madrid, Spain,
Subject Categories (SSIF 2011)
Telecommunications
Signal Processing
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.23919/EuMC.2018.8541618