Article Dans Une Revue IEEE Transactions on Applied Superconductivity Année : 2009

Reduced Probability of Noise Introduced Malfunction in RSFQ Circuits by Implementing Intrinsic $\pi$-Phaseshifter

Résumé

The Rapid Single Flux Quantum electronics family is based on the magnetic flux quantum which is exchanged between adjoining superconducting loops by a switching event of a Josephson junction. This digital circuit family is characterized by a low switching energy, which makes it susceptible to noise introduced bit-errors. For industrial applications a certain noise immunity is required which is still a challenge especially for circuits of higher complexity. Our theoretical analysis showed a significant impact of the phase offset caused by a π-phaseshifter. It can be utilized as a kind of noiseless current source increasing the robustness of RSFQ electronics even for circuits fabricated in mature Nb-technology. We experimentally investigated the influence of the π-phaseshifter on the biterror rate of a toggle Flip-Flop. We designed dedicated test circuits with and without a phaseshifter for a stability comparison. Our presented experiments show significant variances in the bit error rate confirming the improved immunity against noise. There are only slight differences in the layout of both cells, thus it can be concluded that this advantage is based only on the influence of the phaseshifter. Design and fabrication were performed by FLUXONICS Foundry.

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hal-04918013 , version 1 (28-01-2025)

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O. Mielke, T. Ortlepp, Pascal Febvre, F.H. Uhlmann. Reduced Probability of Noise Introduced Malfunction in RSFQ Circuits by Implementing Intrinsic $\pi$-Phaseshifter. IEEE Transactions on Applied Superconductivity, 2009, 19 (3), pp.621-625. ⟨10.1109/TASC.2009.2018145⟩. ⟨hal-04918013⟩
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