Non‐uniform sampling based on an adaptive level‐crossing scheme

Level‐crossing (LC) analog‐to‐digital (A/D) converters can efficiently sample certain classes of signals. An LC A/D converter is a real‐time asynchronous system, which encodes the information of an analog signal into a sequence of non‐uniformly spaced time instants. In particular, this class of A/D converters uses an asynchronous data conversion approach, which is a power efficient technique. In this study, the authors propose adaptive and multi‐level adaptive LC sampling models as alternatives to conventional LC schemes and apply an iterative algorithm to improve the reconstruction quality of LC A/D converters. This simulation results show that multi‐level adaptive LC outperforms conventional A/D converters such as sigma‐delta A/D converters in terms of performance and computational complexity.