On the effects of PRBS non-idealities in signal reconstruction from AICs

The paper presents a sensitivity analysis of the non-idealities introduced by the Pseudo Random Binary Sequence (PRBS) on two modulation-based architectures of Analog-to-Information Converters (AICs), namely the Random Demodulator and the Modulated Wideband Converter. In particular, the effects of both PRBS pulse shape and jitter are contemplated. The emerging findings from this analysis can guide the design process of AICs, so that the jitter effect can be brought below acceptable levels for a given target application. The analysis is carried out firstly by characterizing the PRBS pulse shape, and then by including the calibration data in the behavioral models of the two architectures. The reconstructed signal is thus evaluated for different values of random and deterministic jitter, in terms of Spurious Free Dynamic Range and Signal to Noise And Distortion Ratio. The results highlight a different behavior of the two architectures due to the different reconstruction models they adopt. Mainly, the identification phase of the measurement matrix proves to be able to compensate the jitter effect when jitter is correlated with the PRBS sequence.