A sigma-delta bandpass ADC modelling in superconducting RSFQ technology with VHDL-AMS

This paper presents a sigma delta bandpass ADC modelling based on RSFQ (rapid single flux quantum) technology with VHDL-AMS. A Josephson junction model is proposed and simulated based on RCSJ electrical model. Each ADC element is dissociated and simulated to validate its behaviour. We assimilate ADCpsilas comparator which is composed by two Josehpson junctions to an ideal rectangular pulses generator. Pulses duration is directly a physical parameter obtained by technology. We give relations between ADC performance (SNR) to the comparator SFQ pulses form and duration with normalized physical parameters.