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Experimental analysis of a new generation of compact Josephson-inductance based RSFQ circuits

Th. Ortlepp, B. Dimov, Jürgen Kunert, H.-G. Meyer, Pascal Febvre, F.H. Uhlmann

Published Jun 10, 2007• 0 citations
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Within the classical Rapid Single-Flux Quantum (RSFQ) digital designs, the superconductive phase dropping necessary for the optimal SFQ data processing is realized with short sections of transmission lines serving as lumped inductances. This approach meets several hard restrictions about some promising future RSFQ applications requiring a drastic reduction of the junctions' critical currents. In this paper, we analyse these restrictions, and present an alternative and experimentally verified technique for superconductive phase dropping, which is compatible with any RSFQ fabrication technology. This technique provides compact and robust RSFQ digital circuits with highly improved fabrication yield.
Abstract:- In this paper we consider the Rapid Single-Flux Quantum (RSFQ) circuits with reduced Josephson current density and especially deal with one of the basic building blocks of these electronics- the DC to SFQ converter. For future promising RSFQ applications the critical current of the Josephson junctions should be reduced (by reduction of Josephson current density) to several µA, resulting into values of the interferometer’s inductance of several hundreds of pH. Such large inductances cannot be efficiently realized and we utilize an approach for substitution of inductances by arrays of classical Josephson junctions operating in nonswitching mode. We investigate the classical DC to SFQ converter and based on the utilized approach we design a new schematic with reduced Josephson current density. The circuit is optimized with respect to yield and fabrication margins of the design parameters. Key-Words:- Superconductivity, Rapid Single-Flux Quantum (RSFQ) electronics, Josephson junction, DC to SFQ converter. 1