High‐speed single‐flux‐quantum circuit using planarized niobium‐trilayer Josephson junction technology
| Autor: | M. B. Ketchen, J. E. Lukens, W. H. Mallison, M. Bhushan, Paul I. Bunyk, Vasili K. Semenov, A. Oliva, Konstantin K. Likharev |
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| Rok vydání: | 1995 |
| Předmět: |
Physics
Josephson effect Physics and Astronomy (miscellaneous) business.industry Pulse generator Integrated circuit law.invention Pi Josephson junction law Condensed Matter::Superconductivity Magnetic flux quantum Rapid single flux quantum Superconducting tunnel junction Optoelectronics business Ground plane |
| Zdroj: | Applied Physics Letters. 66:646-648 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.114147 |
| Popis: | A simple test circuit of the rapid single‐flux‐quantum (RSFQ) logic family has been implemented in a planarized all‐refractory technology using only two superconducting layers and small Nb/AlOx/Nb Josephson junctions (nominally 1.5×1.5 μm2) with critical current density jc≊6 kA/cm2. A special layout design of the integrated circuit (including a SFQ pulse generator, Josephson transmission line, and T flip–flop) was used to reduce 3D inductances resulting from absence of the ground plane. For samples with various junction parameters, the maximum frequency of the SFQ pulse train, which could be divided by 2 by the flip–flop, ranged from 200 to 370 GHz. |
| Databáze: | OpenAIRE |
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