Current pulse generator: A circuit for programming RRAM in current mode

Switching uniformity, as a major challenge, hinders the practical implementation of resistive random access memory (RRAM) in memory application. Operating RRAM in current mode is proposed as an efficient method to improve programming schemes accuracy within the finite readout window. In this article, we demonstrate a current generator circuit to perform current programming on filamentary-based RRAM. Current mirror topology is used in our circuit to convert an external pulse voltage into a pulse current fed to RRAM directly with an amplitude equivalent to the DC reference current. The targeting ranges of RRAM’s programming current are up to 400 μA and, in that case, our proposed circuit achieved minimum current mismatch of 1%.