A SURVEY OF BEHAVIORAL MODELING OF FERROELECTRIC CAPACITORS

Six different behavioral models for ferroelectric capacitors are surve yed with an emphasis on their usefulness in the transient circuit simu lation of integrated nonvolatile memories. These models can be broadly classified into two categories, namely, those that rely on the hyster esis loop and those that rely on the switching current of a ferroelect ric capacitor. The former often involves a continuous cycling of a fer roelectric capacitor with a sinusoidal waveform. The latter employs a pulse measurement technique to capture the switching current of the ca pacitor. The pulse waveform applied to the ferroelectric capacitor in the latter approach resembles the actual waveform encountered in a typ ical ferroelectric memory access. This resemblance makes switching-cur rent based models more suitable for use in high-speed-memory circuit s imulations.