D. Al-Mozani, A. Wentzel and W. Heinrich

Published in:

Frequenz, vol. 71, no. 1-2, pp. 11-17 (2017).

Abstract:

In this paper, a first study of distortion in digital power amplifiers (PA) is presented. The work is based on a voltage mode class-S PA with a GaN MMIC for the 900 MHz frequency band. The investigation focuses on the quasi- static amplitude-to-amplitude (AM-AM) and amplitude-to- phase (AM-PM) distortions. Different digital modulation schemes are applied and studied versus output power back-off. This includes two pulse-width modulation (PWM) versions as well as band-pass delta-sigma (BPDS) modulation. The results are verified by measurement data.

Keywords:

AM-AM/AM PM distortion, digital power amplifier, Class-S, GaN HEMT.

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