High Efficiency, High Bandwidth Switch-Mode Envelope Tracking Supply Modulator

F. Hühn, F. Müller, L. Schellhase, W. Heinrich, A. Wentzel

Published in:

IEEE MTT-S Int. Microw. Symp. Dig., Los Angeles, USA, Aug. 4-6, Virtual Event, ISBN 978-1-7281-6815-9, pp. 853-856 (2020).

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Abstract:

This paper presents a novel amplitude modulator concept for envelope tracking power amplifiers, which provides maximum efficiency in the lower output voltage ranges, thus nicely matching the probability density function of modern high-peak-to-average-power baseband signals. It can easily handle modulation bandwidths in excess of 300 MHz. Furthermore, it operates purely in switch mode, unleashing great potential for overall efficiency. A first hardware implementation reaches around 60% conversion efficiency and over 84% when the output voltage is at its minimum value.

Ferdinand-Braun-Institut (FBH), Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany

Keywords:

Switching circuits, Power amplifiers, Radio transmitters.