Abstract
Methods to generate an accurate reference current by averaging multi-pair dummy cells’ c urrents for distinguishing the data in sense ampli fiers (S/As) of a large scale memory with resis- tance change cell is presented and analyzed. The predicted charac- teristics are con firmed by comparing them with measurement re- sults of the functionalities and the retention time distributions in a floating body random access memory (FBRAM). The methods are found to be especially effective in s ituations where signals are seri- ously degraded such as in sensing the signals of tail bit cells in re- tention time distributions, makin g the retention time performance of the FBRAM improved drastically. The sense ampli fiers which can accommodate the dummy cell averaging methods are identi- fied to find a necessary condition for a S/A to afford the methods.