Supply Modulation of a Linear Doherty Power Amplifier
Paper in proceedings, 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


power amplifiers

supply modulation

Doherty amplifier


Dan Fishler

University of Colorado at Boulder

Tommaso Cappello

University of Colorado at Boulder

William Hallberg

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Taylor Barton

University of Colorado at Boulder

Zoya Popovic

University of Colorado at Boulder

2018 48th European Microwave Conference, EuMC 2018

519-522 8541618
978-287487051-4 (ISBN)

48th European Microwave Conference, EuMC 2018
Madrid, Spain,

Subject Categories


Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering



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