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 digitalto-analog (DA) conversion involved in this operation is based on a differential digital coding which drives a custom digital-toanalog 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.
This paper presents the current status and trends in research on Full Software Radio (FSR). Concerning the receiver path after defining Software Defined Radio (SDR) versus FSR a new version of the Sampled Analog Signal Processor (SASP) is presented and experimental results are discussed. The new version doubles the signal bandwidth while the power consumption is reduced to less than 100 mW. For the transmitter path, a new FSR architecture is presented based on Riemann's algorithm and a charge pump. A GaN demonstrator of the Riemann's Pump is presented, which generates any signal including concurrent emissions in the 0-to-1 GHz band.
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