Space radiation including photons, heavy ions, neutrons and α-particles poses significant challenges to the stability and reliability of memory circuits. These high-energy particles can penetrate into the semiconductor materials and interact causing charge deposition and ionization tracks that can lead to data corruption, soft errors, or even permanent failures in extreme cases. As transistor sizes shrink, the integration density of the memory circuits, such as static random-access memory (SRAM) cells increase, making them more susceptible to single-event upsets (SEUs). 6T SRAM cell is more prone to soft errors, where unintended bit flip can occur due to external radiation, resulting in potential reliability issues during memory operations. To mitigate such issues, this paper proposed, a novel radiation hardened 9T SRAM cell to improve soft error rate. The performance of the proposed 9T SRAM cell is evaluated at 45 nm technology node and compared with previously reported SRAM cells, such as 6T, TA8T, 9T, 11T, 10T, 12T, WFC12T, GRNFET9T and PNT9T SRAM cell configurations across a range of supply voltages from 0.5V to 1V. The proposed 9T SRAM cell operates in a single-ended read and write mode and enabling efficient read and write operations. Its read stability shows an improvement by 1.96×/1.83×/1.02×/1.91×/1.02×/1.01×/2.06×/1.43× as compared to conventional 6T, TA8T, 9T, 11T,10T, WFC12T, GRNFET9T and PNT9T SRAM cells, respectively, at 1 V supply voltage. The critical charge in proposed 9T SRAM cell is 2.5×/2.35×/1.14×/1.33×/1.19×/1.08×/2.47×/1.11×/1.11× improved as compared to 6T/TA8T/9T/11T/10T/12T/WFC12T/GRNFET9T/PNT9T SRAM cells. In addition to this, proposed 9T cell has 1.13×/1.06×/1.95×/1.20×/1.04×/1.04×/1.12×/1.05×1.20× less read access time than conv.6T/TA8T/9T/11T/10T/12T/WFC12T GRNFET9T/PNT9T SRAM cells.
Moreover, Ion/Ioff ratio in proposed 9T SRAM cell is 3.0×/2.98×/4.26×/3.01×/3.21×/1.13×/3.2×/3.0×/3.42× higher than conv.6T/TA8T/9T/11T/10T/12T/WFC12T/GRNFET9T/PNT9T SRAM cells. The Monte Carlo simulation is conducted with 4000 random samples to analyze the impact of process variations on read power and read current. The overall performance and soft-error resilience of the proposed 9T SRAM cell are investigated with the ratio of reliability and stability to energy product (RSEAP). This highest RSEAP value of proposed 9T SRAM cell makes its suitability for aerospace applications.
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