Evaluation of second-order bandpass sampling receivers for software defined radio

This paper proposes a new design for second-order bandpass sampling receivers based on passive 90° hybrids and two parallel ADCs sampled with the same clock. Such a topology is suitable for wideband digital receivers appointed for software defined radio and spectrum sensing capable cognitive radios. The proposed architecture and digital compensation algorithm are a simple solution for the reception of a modulated signal under an adjacent stronger interference and for multiband multi-carrier modulated signal communication, due to its available bandwidth maximization. The results will be assessed in terms of spectrum representation and error vector magnitude evaluation.