HSPICE macromodel of PCRAM for binary and multilevel storage

A general macromodel of the phase change random access memory (PCRAM) elements for use in HSPICE-based computer simulator is proposed in this paper by introducing physical models of PCRAM elements. It can simulate the dc and transient behavior of PCRAM element. In this paper, the model was integrated with the standard R/W circuit and successfully simulated the R-I curve and dependence between amplitude and width of programming pulses. A comparison between experimental and simulation results were also given. Furthermore, by including the partial crystallization states, the macromodel was developed for simulating the multilevel storage.