Envelope Delta-Sigma-Modulated Voltage-Mode Class-S PA
A. Wentzel1, S. Hori2, M. Hayakawa2, K. Kunihiro2, W. Heinrich1
Published in:
42nd European Microwave Conf. (EuMC 2012), Amsterdam, The Netherlands, Oct. 28 - Nov. 2, pp. 120-123 (2012).
Abstract:
This paper reports on a digital transmitter architecture for the 450 MHz band using an envelope delta-sigma modulator realized in CMOS and a voltage-mode class-S PA based on GaN MMICs. The class-S PA is characterized with narrowband single-tone signals and a single-carrier downlink WCDMA signal with a peak-to-average power ratio of 7.5 dB. Using single-tone excitation the PA shows a maximum drain efficiency of 86% and a peak output power of 4.4 W. At 6 dB and 10 dB back-off, 59% and 36% efficiency are achieved, respectively. With the WCDMA input signal a maximum drain efficiency of 64% and an output power of 0.7 W is reached. The ACLR shows values of about -34 dBc (5 MHz) and -38 dBc (10 MHz). This is the first complete voltage-mode class-S PA chain characterized with standard communication signals.
1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
2 NEC Corporation, Kawasaki, Kanagawa 211-8666, Japan
Keywords:
microwave power amplifier, class-S, voltage-mode, envelope delta-sigma, modulation, GaN, MMIC.
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