iosr-JVSP   Volume-14 ~ Issue-1 ~ Jan - Feb. 2024

ABSTRACT: Electronic circuits are exposed to very high energy radiation in the harsh conditions of outer space. This leads to soft errors such as single-event upsets (SEU), double-event upsets (DEU) and single-event transients (SET). The memory circuits are the most susceptible to these soft errors resulting in severe data loss. This paper proposes the design for an SRAM cell that is radiation hardened by design (RHBD). A comparative study of the standard SRAM cell and the RHBD SRAM cell indicates that the proposed design is resilient to SEUs and DEUs. The proposed design is an improvement on the 8T SRAM cell design and includes a 20T triple interlocked cell (TICE) design. The error correction capabilities of both designs are compared by manually injecting bit upsets......

Keywords: DEU; Radiation Hardening; RHBD; SET; SEU; DEU; SRAM

[1]. N. Chen, T. Wei, X. Wei and X. Chen, "A Radiation Hardened SRAM in 180-nm RHBD Technology," 2013 IEEE 11th International Conference on Dependable, Autonomic and Secure Computing, 2013, pp. 159-162
[2]. N. K. Z. Lwin, H. Sivaramakrishnan, K. -S. Chong, T. Lin, W. Shu and J. S. Chang, "Single-Event-Transient Resilient Memory for DSP in Space Applications," 2018 IEEE 23rd International Conference on Digital Signal Processing (DSP), 2018, pp. 1-5
[3]. Yuanyuan Han, Tongde Li, Xu Cheng "Radiation Hardened 12T SRAM With Crossbar-Based Peripheral Circuit in 28nm CMOS Technology," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, no. 7, pp. 2962-2975, July 2021
[4]. C. Naga Raghuram, B. Gupta and G. Kaushal, "Double Node Upset Tolerant RHBD15T SRAM Cell Design for Space Applications," in IEEE Transactions on Device and Materials Reliability, vol. 20, no. 1, pp. 181-190, March 2020
[5]. D. Patel and N. Gajjar, "An Investigation of Single Event Upset Hardened SRAM Bit Cells," 2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT), 2021, pp. 1-4.

ABSTRACT: The need for high capacity long haul telecommunication system to carry huge traffic demands in recent times has lead to the use of optic fiber communication system because of its high capacity carrying advantage over wireless systems. But optic fiber signals suffer some signal impairment issues such as nonlinearity which tends to degrade its transmission performance. This paper proposed the use of adaptive optical equalizer to mitigate such impairments. To achieve that, a simulink model of the system was first developed for simulation experiments. Then the impact of out-of-bound nonlinear signal on the three key performance indicators (Q Factor, Bit Error Ratio and Eye Height) studied was evaluated. An adaptive optical equalizer system was them applied to the network and......

Keywords: Nonlinear optic fiber, self-phase modulation, Kerr effect, refractive index, nonlinearity mitigation

[1]. Paul E. and Green, Jr, 2003 " Fiber Optic Networks", Prince Hall, Englewood Cliffs, New Jersey,
[2]. Agrawal, G. P.,2001, "Nonlinear Fiber Optics", 3rd edition, Academic Press, San Diego, CA, 2001.
[3]. Poggiolini, P.; Jiang, Y. "Recent Advances in the Modeling of the Impact of Nonlinear Fiber Propagation Effects on Uncompensated Coherent Transmission Systems". J. Lightw. Technol. 2017, 35, 458–480. [CrossRef]
[4]. Golani, O.; Feder, M.; Shtaif, M. Kalman, "MLSE equalization of nonlinear noise". In Proceedings of the 2017 Optical Fiber Communications Conference and Exhibition (OFC), Los Angeles, CA, USA, 19–23 March 2017; Optical Society of America: Washington, DC, USA, 2017.
[5]. Golani, O.; Elson, D.; Lavery, D.; Galdino, L.; Killey, R.; Bayvel, P.; Shtaif, M. "Experimental characterization of nonlinear interference noise as a process of intersymbol Interference". Opt. Lett. 2018, 43, 1123–1126.