Design of an RF-subsampling based tri-band AIS and DSC radio receiver

This paper proposes the design of a tri-band AIS1, AIS2 and DSC VHF receiver. Original highly integrated and single path RF front-end is defined by replacing conventional analog mixers with a sample and hold circuit for frequency downconversion. Detailed system level design based on RF-subsampling theory allowed the choice of an optimized sampling frequency of 48.93 MHz for the three radio bands by considering anti-aliasing and noises constraints. The receiver design is based on commercial components with relaxed characteristics. Simulation results with ADS models for selected components shows good performances with an SNR degradation of 7 dB.