2015 Volume 12 Issue 22 Pages 20150804
In this paper, the generation mechanism of single event upset reversal (SEUR) between 2 PMOS in SRAM cells is studied in depth based on 45 nm CMOS technology. We find that SEUR not only depends on the charge sharing but also follows the rule that the charge collection of passive device is larger and longer than that of active device. Based on SEUR generation mechanism, two novel layouts named Drain-Source-Drain (DSD) and Dummy are proposed to increase the rate of SEUR for reducing SEU vulnerability of SRAM cells. Compared with the traditional layout, DSD and Dummy layout reduce 4.26% and 31.56% SEU sensitive area under normal incident, respectively. For tilted incident, Dummy layout sharply increases SEUR rate while DSD layout is not better than the traditional layout on enhancing SEUR. Consequently, the proposed Dummy layout can improve SEU reliability without area penalty.