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Design and simulation of the simplest RSFQ circuits based on on HTS bicrystal Josephson junctions

Anna Kidiyarova-Shevchenko, M. M. Khapaev, P.N. Shevchenko, Timur V. Filippov, M. Yu. Kupriyanov

Published Jan 1, 1995• 0 citations
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We have investigated various geometrical design dependencies for rapid single-flux-quantum (RSFQ) circuits in high-Tcsuperconductors (HTS) technology, including the characteristics of the intermediate inductances. Structural- and temporal-dependent combinations of Cn-Rn(capacitance and normal resistance of the Josephson junctions, JJs) in the HTS technology are also investigated. Relatively favorable combinations of normal resistance and low capacitance of the JJs needed in the HTS technology for RSFQ circuits have been made possible by recent fabrication methods of high-quality YBCO films. Obtaining these devices is made achievable by using the grain boundary structures and high critical current density (JC) of the HTS JJs. Mutual interactions of the intermediate inductances with other parts of the whole circuit are examined and optimized for the best operation situation. Here in particular, the operation of the HTS Josephson transmission-line (JTL) cells utilizing the grain boundary Josephson junctions, including various structural inductances, is studied based on the reported parameters of the developed devices and thoroughly analyzed by simulation results.

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We fabricated and tested high-temperature superconducting (HTS) rapid-single-flux-quantum (RSFQ) circuits using interface-engineered Josephson junction (IEJ). The characteristics of high-speed operation were examined by voltage-divider operation based on the toggle-flip-flop circuit. An operation at 155 GHz was obtained at 15 K and the proper functioning of the voltage divider was observed up to 27 K. Temperature dependence of the maximum operation speed was analyzed by circuit simulation with thermal-noise sources. To achieve higher speed operation using a Josephson junction with a higher I/sub c/R/sub n/ product, we also fabricated an RSFQ balanced comparator using IEJ; proper switching characteristics of the circuit was confirmed up to 190 GHz at 30 K. The bias condition dependencies were studied based on the circuit simulations in the relationship of the I/sub c/R/sub n/ product. The results of circuit simulation indicate that a Josephson junction with an I/sub c/R/sub n/ product of more than 0.7 mV is required for high-speed operation (100 GHz) in high-temperature range (30-40 K). We believe that the IEJ is a promising junction candidate for realizing high-speed operation in a high-temperature range.

IEEE Transactions on Applied Superconductivity•Mar 1, 2001•17 citations
We have investigated various geometrical design dependencies for rapid single-flux-quantum (RSFQ) circuits in high-Tcsuperconductors (HTS) technology, including the characteristics of the intermediate inductances. Structural- and temporal-dependent combinations of Cn-Rn(capacitance and normal resistance of the Josephson junctions, JJs) in the HTS technology are also investigated. Relatively favorable combinations of normal resistance and low capacitance of the JJs needed in the HTS technology for RSFQ circuits have been made possible by recent fabrication methods of high-quality YBCO films. Obtaining these devices is made achievable by using the grain boundary structures and high critical current density (JC) of the HTS JJs. Mutual interactions of the intermediate inductances with other parts of the whole circuit are examined and optimized for the best operation situation. Here in particular, the operation of the HTS Josephson transmission-line (JTL) cells utilizing the grain boundary Josephson junctions, including various structural inductances, is studied based on the reported parameters of the developed devices and thoroughly analyzed by simulation results.
We fabricated and tested high-temperature superconducting (HTS) rapid-single-flux-quantum (RSFQ) circuits using interface-engineered Josephson junction (IEJ). The characteristics of high-speed operation were examined by voltage-divider operation based on the toggle-flip-flop circuit. An operation at 155 GHz was obtained at 15 K and the proper functioning of the voltage divider was observed up to 27 K. Temperature dependence of the maximum operation speed was analyzed by circuit simulation with thermal-noise sources. To achieve higher speed operation using a Josephson junction with a higher I/sub c/R/sub n/ product, we also fabricated an RSFQ balanced comparator using IEJ; proper switching characteristics of the circuit was confirmed up to 190 GHz at 30 K. The bias condition dependencies were studied based on the circuit simulations in the relationship of the I/sub c/R/sub n/ product. The results of circuit simulation indicate that a Josephson junction with an I/sub c/R/sub n/ product of more than 0.7 mV is required for high-speed operation (100 GHz) in high-temperature range (30-40 K). We believe that the IEJ is a promising junction candidate for realizing high-speed operation in a high-temperature range.