A pseudo-weighted sensing scheme for memristor based cross-point memory

To further extend the scaling trend of traditional CMOS technology, many hybrid architectures integrating emerging device technologies have been proposed recently. Among them, memristor based cross-point memory (MBCPM) demonstrates great potential in data storage and computation. However, accessing a cross-point memory inevitably induces currents flowing through those unselected cells, called as sneak paths. The existence of sneak paths severely limits the capacity growth of MBCPM. In this work, we proposes a pseudo-weight sensing scheme. The design minimizes the impact of sneak paths in read operations by forcing all the unselected rows and columns to the same potential. Moreover, we use an op-amp to sum up the weighted currents through multiple cells and retrieve their information at a time. Thus, the efficiency of read peripheral circuit is significantly enhanced.