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Riemann-pump based RF-power DACs in GaN technology for 5G base stations

: Weiß, Markus; Friesicke, Christian; Quay, Rüdiger; Ambacher, Oliver


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Microwave Workshop Series on 5G Hardware and System Technologies, IMWS-5G 2018 : 30th-31st August 2018, UCD, Dublin, Ireland
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-1197-5
ISBN: 978-1-5386-1196-8
ISBN: 978-1-5386-1198-2
International Microwave Workshop Series on 5G Hardware and System Technologies (IMWS-5G) <2018, Dublin>
Fraunhofer IAF ()

This paper introduces two realizations of a Riemann-Pump based digital transmitter geared towards software defined radio in 5G systems. In contrast to traditional digital-to-analog converter (DAC) concepts, the Riemann Pump exhibits a higher signal-to-noise ratio (SNR). Since the used 0.25 m gallium nitride (GaN) technology has a transit frequency of 30 GHz, an oversampling ratio (OSR) of five for the targeted frequency range from DC to 6 GHz is enabled. As the Riemann Pump serves as a digital driver, a co-integration with a suitable wide bandpower amplifier is possible to reach high power levels. A hybrid assembly is compared to the fully integrated Riemann Pump circuit in GaN technology. The world’s first measurement data of a two bit resolution Riemann Pump in GaN technology are discussed. Radio frequency (RF) power in the watt level range is measured for frequencies between 0.5 GHz - 12GHz into a capacitive load representing the input capacitance of a power amplifier.