  Emerging electronic devices are promising to drive the performance of
computer systems to new heights, against the notable saturation in traditional
transistor-based architectures. Among them, resistive RAM -- or ReRAM -- has
attracted a lot of attention among scientists since its practical realization
was reported in 2008 and numerous devices, circuits and systems, and also
models have been described in the literature. However, behavioral models fail
to reproduce device parameter variations and the drift of device state in the
absence of a stimulus. This shortcoming substantially reduces the practical
relevance of systems and circuits designed with existing models. The work at
hand deals with the development of a behavioral model that integrates device
parameter variation and state drift based on data collected from our
measurements of real devices. As we show in this paper, BELIEVER model enables
engineers to conduct more reliable and meaningful design and simulations of
circuits and systems that use ReRAMs.
