Abstract
The fault tolerance of CMOS D and RS flip-flops with a two-phase structure and memory cells based on them under exposure to single nuclear particles depends on the response to charge collection by several nodes. The relation between pairs of nodes with identical critical characteristics and specifics of symmetry of electric couplings between trigger transistors was established for DICE and Quatro cells. Critical pairs of nodes with minimal critical charges and an increased noise immunity were determined. The guidelines for mutual arrangement of transistors in DICE cells were given. The examples of quantitative estimation of critical dependences were given for cells with a 65 nm bulk CMOS design rule. DICE cells have an advantage in the event of multiple influence on the nodes.
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