Applying adaptive temporal filtering for SET mitigation based on the propagation-delay of every logical path

Abstract

This paper proposes the use of a programmable radiation hardened flip-flop to select the most appropriate delay in the SET temporal filtering for each flip-flop in a circuit. Each flip-flop can filter SETs by using different delays based on the propagation-delay of its logical path. The propagation-delay variances among multiple paths can be used to increase or reduce the delay of the SET filtering. In this way, a delay with a minimum performance impact can always be selected. This approach was validated by electrical simulations in a case-study circuit Different SET pulse widths were injected. Results have shown the efficiently of this technique to filter SETs and to tolerate SEUs in integrated circuits.