Comparison of Dual-Rail and TMR Logic Cost Effectiveness and Suitability for FPGAs With Reconfigurable SEU Tolerance

We compare four circuit methods for single event (SE) mitigation: single string with radiation-hardened flip flops, delay-guarded logic, dual-rail logic, and triple modular redundancy (TMR). Test results of the circuit methods at 180 nm are presented. We then describe a novel reprogrammable FPGA architecture which can be configured based on SE mitigation and performance needs, and we evaluate the candidate SE mitigation methods as to suitability for such architecture.