Analyzing Scaled Reduced Precision Redundancy for Error Mitigation under Proton Irradiation

Reduced precision redundancy (RPR) is an alternative to triple modular redundancy (TMR) that reduces the area overhead at the expense of minor accuracy loss in case of error. In this work, we propose a Scaled RPR approach for multistage circuits and analyze the error mitigation tradeoffs. As a case study, several fast Fourier transform designs were tested with low-energy protons and fault injection. Experimental results show that the proposed approach achieves error mitigation with good accuracy, while significantly reducing the area overhead with respect to a full precision TMR approach.This work was supported in part by the Spanish Ministry of Science and Innovation under Project PID2019-106455GB-C21 and in part by the Community of Madrid under Project 49.520608.9.18.Publicad