The Riemann Pump: a Concurrent Transmitter in GaN Technology

Abstract : An original arbitrary waveform generator (AWG) architecture suited for software radio (SR) transmission is presented. A piecewise linear approximation of the wanted signal is generated thanks to a predefined set of slopes. The digital-to- analog (DA) conversion involved in this operation is based on a differential digital coding which drives a custom digital-to-analog converter (DAC), named here the Riemann Pump. This circuit is in charge of outputting the piecewise linear signal by integration of current steps into a capacitive load, potentially being the input impedance of a power amplifier. Simulations have been carried out on a first design, developed in a GaN technology, with a configuration that covers 1 GHz bandwidth with an oversampling ratio (OSR) of 4 and 3 input bits. The generation of concurrent modulated signals is demonstrated, with a rejection of 30 dBr over the whole band. The system exhibits promising performances as for the realization of a multi standard concurrent radio frequency transmitter with moderate hardware complexity
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Yoan Veyrac, Francois Rivet, Yann Deval, Dominique Dallet, Patrick Garrec, et al.. The Riemann Pump: a Concurrent Transmitter in GaN Technology. ICECS 2014, Dec 2014, MARSEILLE, France. pp.12-18, ⟨10.1109/ICECS.2014.7050055⟩. ⟨hal-01064369⟩

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