1. Forschung
  2. Publikationen
  3. Highly Efficient 1.8-GHz Ampli ...


Wissenschaftliche Beiträge

 zu Konferenzen finden Sie übrigens auch bei den Terminen.

Highly Efficient 1.8-GHz Amplifier With 120-MHz Class-G Supply Modulation

N. Wolff, W. Heinrich, and O. Bengtsson

Published in:

IEEE Trans. Microwave Theory Tech., vol. 65, no. 12, pp. 5223-5230 (2017).


A broadband and highly efficient class-G supply modulated power amplifier (PA) system with 120-MHz instantaneous modulation bandwidth operating in the 1.8-GHz band is presented in this paper. The core element is the fast class-G supply modulator which switches the supply voltage of the RF PA between three discrete levels with a minimum pulse duration of 2.5 ns. Two designs for the drain bias interface between PA and modulator are evaluated where the best results are achieved for an implementation based on a λ/4-wavelength RF-choke. Measurement results are presented for a 120-MHz contiguous carrier aggregated signal using eleven subcarriers with modulation bandwidths ranging from 5 to 20 MHz for each subcarrier. In combination with digital predistortion, the system achieves 38.5% PAE with -40-dB EVM and -46-dB ACLR for the 120-MHz multicarrier signal with a peak-to-average power ratio of 10 dB at the PA output and 39-dBm average output power. The total efficiency enhancement achieved by the class-G modulation is 13% points.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany

Index Terms:

Class-G supply modulation, efficiency enhancement, envelope tracking, 5G mobile communication, power amplifiers (PAs).

Copyright © 2017 IEEE - All Rights Reserved. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Full version in pdf-format.