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A general approach for determining the switching probability in rapid single flux quantum logic circuits

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3 Author(s)
T. Ortlepp ; Dept. of Fundamentals & Theory of Electr. Eng., Univ. of Technol. Ilmenau, Ilmenau, Germany ; H. Toepfer ; H. F. Uhlmann

A major restriction in the development of a working Rapid Single Flux Quantum (RSFQ) logic circuit with high-Tc superconductors is given by the influence of thermal noise. This gives reason to ask for a general determination of the digital bit error rate. As other approaches, our method of calculating the switching probability is based on the Fokker-Planck equation. In the past few years the bit error rates for a single Josephson junction, SQUIDs and the comparator were calculated by using this theory. We demonstrate numerical solution of the multidimensional Fokker-Planck equation to calculate bit error rates due to thermal noise for a Toggle Flip Flop circuit. In the present work, we combine thermal noise analysis with the effects of process variations in order to derive rules for designing high-Tc RSFQ logic circuits

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:11 ,  Issue: 1 )